{"id":11819,"date":"2024-02-02T12:56:49","date_gmt":"2024-02-02T11:56:49","guid":{"rendered":"https:\/\/wintech-groupe.com\/?p=11819"},"modified":"2024-09-13T11:10:46","modified_gmt":"2024-09-13T09:10:46","slug":"what-are-the-characteristics-of-optical-window-materials","status":"publish","type":"post","link":"https:\/\/wintech-groupe.com\/en\/news\/what-are-the-characteristics-of-optical-window-materials\/","title":{"rendered":"What are the characteristics of optical window materials?"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1331.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p>Optical windows are used for monitoring, observing or measurement purposes. They are commonly used by industry (aerospace, defense, medical, petrochemicals, etc.) and research players (laboratories, research institutes, engineering schools, etc.).<strong> To design an <a href=\"https:\/\/wintech-groupe.com\/en\/custom-optical-windows\/\">optical window<\/a>, it is necessary to indicate precisely its application<\/strong> (conditions of use, spectral range, expected results) <strong>in order to determine which material will be most suitable for its design<\/strong>. Optical materials have very specific characteristics, this article will take you through them.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><div class=\"fusion-separator-border sep-single sep-dotted\" style=\"--awb-height:20px;--awb-amount:20px;--awb-sep-color:#000000;border-color:#000000;border-top-width:1px;\"><\/div><\/div><div class=\"awb-toc-el awb-toc-el--1\" data-awb-toc-id=\"1\" data-awb-toc-options=\"{&quot;allowed_heading_tags&quot;:{&quot;h2&quot;:0},&quot;ignore_headings&quot;:&quot;&quot;,&quot;ignore_headings_words&quot;:&quot;inscription|article|lire|Cat\\u00e9gories|vus|newsletter|categories|posts&quot;,&quot;enable_cache&quot;:&quot;yes&quot;,&quot;highlight_current_heading&quot;:&quot;no&quot;,&quot;hide_hidden_titles&quot;:&quot;yes&quot;,&quot;limit_container&quot;:&quot;custom&quot;,&quot;select_custom_headings&quot;:&quot;&quot;,&quot;icon&quot;:&quot;fa-flag fas&quot;,&quot;counter_type&quot;:&quot;none&quot;}\"><div class=\"awb-toc-el__content\"><\/div><\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><div class=\"fusion-separator-border sep-single sep-dotted\" style=\"--awb-height:20px;--awb-amount:20px;--awb-sep-color:#000000;border-color:#000000;border-top-width:1px;\"><\/div><\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:10px;width:100%;\"><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1331.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_5 1_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:20%;--awb-margin-top-large:0px;--awb-spacing-right-large:9.6%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:9.6%;--awb-width-medium:20%;--awb-order-medium:0;--awb-spacing-right-medium:9.6%;--awb-spacing-left-medium:9.6%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_3_5 3_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:60%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.2%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:3.2%;--awb-width-medium:60%;--awb-order-medium:0;--awb-spacing-right-medium:3.2%;--awb-spacing-left-medium:3.2%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><!--HubSpot Call-to-Action Code --><span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\"><span class=\"hs-cta-node hs-cta-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\" id=\"hs-cta-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\"><!--[if lte IE 8]><div id=\"hs-cta-ie-element\"><\/div><![endif]--><a href=\"https:\/\/hubspot-cta-redirect-eu1-prod.s3.amazonaws.com\/cta\/redirect\/25400659\/42b3ebd6-7dae-4a02-ba76-8a07e39fb292\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\" style=\"border-width:0px;\" src=\"https:\/\/hubspot-no-cache-eu1-prod.s3.amazonaws.com\/cta\/default\/25400659\/42b3ebd6-7dae-4a02-ba76-8a07e39fb292.png\"  alt=\"Nouveau call-to-action\"\/><\/a><\/span><script charset=\"utf-8\" src=\"https:\/\/js-eu1.hscta.net\/cta\/current.js\"><\/script><script type=\"text\/javascript\"> hbspt.cta.load(25400659, '42b3ebd6-7dae-4a02-ba76-8a07e39fb292', {\"useNewLoader\":\"true\",\"region\":\"eu1\"}); <\/script><\/span><!-- end HubSpot Call-to-Action Code --><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_1_5 1_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:20%;--awb-margin-top-large:0px;--awb-spacing-right-large:9.6%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:9.6%;--awb-width-medium:20%;--awb-order-medium:0;--awb-spacing-right-medium:9.6%;--awb-spacing-left-medium:9.6%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-3 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1331.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-4 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:10px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-two\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h2 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:30;line-height:1.2;\">Overview of the main specificities of optical materials<\/h2><\/div><div class=\"fusion-text fusion-text-2\"><p>To design an optical window there are three main categories of materials with different properties: glass, polymers and crystals. Each of these material families is composed of substrates with properties defined according to specific criteria such as transmission, refractive index and Knoop hardness. We offer a general description of the specifics of the most common substrates, followed by comparative tables on their optical transmission, refractive index and hardness.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">N-BK7: the world&#8217;s most produced optical glass<\/h3><\/div><div class=\"fusion-text fusion-text-3\"><p>The N-BK7 is characterized by its high homogeneity, low porosity and ease of machining. Its transmission range is from ultraviolet to shortwave infrared. The N-BK7 has good thermal stability. It is resistant to most non-fluorinated and non-alkaline chemicals but is sensitive to acids. N-BK7 has a low dispersion, which makes it suitable for spectroscopy. N-BK7 is relatively hard but can be susceptible to scratches.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-3 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Borosilicate: a material suitable for harsh environments<\/h3><\/div><div class=\"fusion-text fusion-text-4\"><p>Borosilicate has a high thermal resistance. It is also characterized by low homogeneity and high porosity. It offers good optical transmission in most of the visible and near-infrared spectrum. Resistant to most chemicals, it can be used for applications with exposure to corrosive substances. Borosilicate is suitable for optical windows subjected to severe thermal conditions or harsh chemical environments.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-4 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Silica: suitable for high temperature applications<\/h3><\/div><div class=\"fusion-text fusion-text-5\"><p>Silica is transparent in a wide spectral range from ultraviolet to infrared. Light travels relatively quickly through this material, which is also resistant to many chemicals. However, silica is sensitive to concentrated alkaline solutions. With excellent thermal stability, it withstands high temperatures without deforming or degrading noticeably. A hard material, silica is moderately resistant to scratches and wear.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-5 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Germanium: for infrared applications<\/h3><\/div><div class=\"fusion-text fusion-text-6\"><p>Germanium is a metalloid that transmits about 45% between 2 and 14 \u03bcm at 45\u00b0C. From 100\u00b0C the transmission degrades slowly, and much more rapidly above 200\u00b0C. Exceeding 200\u00b0C results in near-fatal material failure. It is therefore not advisable to use it under these conditions. Germanium is often used in thermal imaging applications. Germanium is very often accompanied by anti-reflective coating in the 3-5 \u03bcm and 8-14 \u03bcm transmission ranges because this allows the reflection losses of the material to be almost completely suppressed. This adds an additional constraint not to exceed 120\u00b0C of use, as the treatments are not resistant to a higher temperature. Finally, there are also hard carbon or DLC treatments that give it increased transmission and mechanical resistance. This is usually in contact with the outside (protects against erosion, scratches, salty air, oxidation, etc.).<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-4 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1331.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-5 fusion_builder_column_1_5 1_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:20%;--awb-margin-top-large:0px;--awb-spacing-right-large:9.6%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:9.6%;--awb-width-medium:20%;--awb-order-medium:0;--awb-spacing-right-medium:9.6%;--awb-spacing-left-medium:9.6%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-6 fusion_builder_column_3_5 3_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:60%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.2%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:3.2%;--awb-width-medium:60%;--awb-order-medium:0;--awb-spacing-right-medium:3.2%;--awb-spacing-left-medium:3.2%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><!--HubSpot Call-to-Action Code --><span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-765346cc-e3f2-46cc-9e69-b7b6dac99aa2\"><span class=\"hs-cta-node hs-cta-765346cc-e3f2-46cc-9e69-b7b6dac99aa2\" id=\"hs-cta-765346cc-e3f2-46cc-9e69-b7b6dac99aa2\"><!--[if lte IE 8]><div id=\"hs-cta-ie-element\"><\/div><![endif]--><a href=\"https:\/\/hubspot-cta-redirect-eu1-prod.s3.amazonaws.com\/cta\/redirect\/25400659\/765346cc-e3f2-46cc-9e69-b7b6dac99aa2\" ><img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-765346cc-e3f2-46cc-9e69-b7b6dac99aa2\" style=\"border-width:0px;\" src=\"https:\/\/hubspot-no-cache-eu1-prod.s3.amazonaws.com\/cta\/default\/25400659\/765346cc-e3f2-46cc-9e69-b7b6dac99aa2.png\"  alt=\"Download our free brochure about special windows\"\/><\/a><\/span><script charset=\"utf-8\" src=\"https:\/\/js-eu1.hscta.net\/cta\/current.js\"><\/script><script type=\"text\/javascript\"> hbspt.cta.load(25400659, '765346cc-e3f2-46cc-9e69-b7b6dac99aa2', {\"useNewLoader\":\"true\",\"region\":\"eu1\"}); <\/script><\/span><!-- end HubSpot Call-to-Action Code --><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-7 fusion_builder_column_1_5 1_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:20%;--awb-margin-top-large:0px;--awb-spacing-right-large:9.6%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:9.6%;--awb-width-medium:20%;--awb-order-medium:0;--awb-spacing-right-medium:9.6%;--awb-spacing-left-medium:9.6%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-5 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1331.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-8 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:20px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-6 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">ZnSe: performance in the mid-infrared<\/h3><\/div><div class=\"fusion-text fusion-text-7\"><p>Zinc selenium (ZnSe) is a crystalline material with moderate transmission (about 70%) in the near-infrared to thermal-wave infrared range. ZnSe does not exhibit significant hardness. It can be easily scratched or damaged. This material is sensitive to moisture and dirt contamination. The ZnSe can handle high power levels of infrared laser beams.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-7 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Multispectral ZnS: for multispectral conditions of use<\/h3><\/div><div class=\"fusion-text fusion-text-8\"><p>Like ZnSe, multispectral zinc sulfide (ZnS) is also a crystal with excellent moderate transmission (about 70%) in the near-infrared to thermal-wave infrared range. This material can be used to design optical windows for different wavelengths. ZnS has a very moderate hardness. However, it has a high thermal resistance (to be used up to 750 \u00b0C). It is appreciated for its visible transmission characteristics.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-8 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">CaF2 and BaF2 fluorinated crystals: for UV, visible and IR optical applications<\/h3><\/div><div class=\"fusion-text fusion-text-9\"><p>Calcium fluoride (CaF2) has excellent optical properties in a wide transmission range: from ultraviolet to longwave infrared. This birefringent material, through which light propagates quite slowly, has a low to moderate dispersion, limiting chromatic aberrations. CaF2 is resistant to many chemicals but can be sensitive to some strong acids. It is suitable for high temperature applications. However, you still have to be careful because it is sensitive to thermal shocks. It is low in hardness and it is susceptible to scratches<\/p>\n<p>Barium fluoride (BaF2) is transparent in a wide range of wavelengths, especially in the deep ultraviolet. Unlike CaF2, light travels relatively fast through BaF2. This material has a rather low dispersion. It is sensitive to moisture and strong acids. With good thermal stability, it can withstand moderate temperatures. It has a low hardness and is susceptible to scratches. Like CaF2, it is sensitive to thermal shock.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"1280\" height=\"720\" alt=\"special windows - wintech groupe\" title=\"special windows &#8211; wintech groupe\" src=\"https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/special-windows-wintech-groupe.jpg\" class=\"img-responsive wp-image-11833\" srcset=\"https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/special-windows-wintech-groupe-200x113.jpg 200w, https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/special-windows-wintech-groupe-400x225.jpg 400w, https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/special-windows-wintech-groupe-600x338.jpg 600w, https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/special-windows-wintech-groupe-800x450.jpg 800w, https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/special-windows-wintech-groupe-1200x675.jpg 1200w, https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/special-windows-wintech-groupe.jpg 1280w\" sizes=\"(max-width: 640px) 100vw, 1280px\" \/><\/span><\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-9 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Quartz: highly resistant to chemically aggressive environments<\/h3><\/div><div class=\"fusion-text fusion-text-10\"><p>Quartz is a crystalline material that can be used for optical applications covering a wide spectral area. It has a relatively low dispersion and minimal absorption. This material efficiently transmits light without significant heat dissipation. It is distinguished by a very high resistance to most chemicals (including strong acids and strong bases). With excellent thermal stability, quartz, a hard material, is resistant to high temperatures.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-10 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Sapphire: one of the hardest materials after diamond<\/h3><\/div><div class=\"fusion-text fusion-text-11\"><p>Sapphire is a transparent crystalline material in a wide spectral wave range from visible to near-infrared. It is particularly transparent in the ultraviolet light. Sapphire is known for its high mechanical, thermal (up to 1000 \u00b0C) and chemical (including strong acids, strong bases) resistance. It has a relatively low dispersion. Light travels quite slowly through this material. Sapphire is extremely hard and resistant to scratches (erosion, abrasion, etc.). Its machining process requires the use of mastered techniques such as the use of ultrasonic technology.<\/p>\n<\/div><div class=\"fusion-text fusion-text-12\"><p><a href=\"https:\/\/wintech-groupe.com\/en\/news\/sapphire-windows-properties-and-advantages\/\">Find out more about the properties and advantages of sapphire optical windows \u2013 Wintech Group&#8217;s expertise<\/a><\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-6 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-bottom:35px;--awb-padding-left:0px;--awb-flex-wrap:nowrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1280px + 0px );margin-left: calc(-0px \/ 2 );margin-right: calc(-0px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-9 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:20px;margin-bottom:20px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-11 fusion-sep-none fusion-title-text fusion-title-size-two\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h2 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:30;line-height:1.2;\">Comparative Tables of Optical Materials: Transmission, Refraction and Hardness<\/h2><\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:5px;margin-bottom:10px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-12 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Material Transmittance Rating for Optical Window<\/h3><\/div><div class=\"fusion-text fusion-text-13\"><p>Transmission is the ability of the optical material to transmit light in a given wavelength (spectral range \u2013 ultraviolet, visible, infrared).<\/p>\n<p><span style=\"text-decoration: underline;\">Summary of the Infrared Spectrum Split:<\/span><\/p>\n<p>Near Infrared (NIR): 0.7 \u03bcm to 0.9 \u03bcm<\/p>\n<p>Shortwave (SW): 0.9 \u03bcm to 2.5 \u03bcm<\/p>\n<p>Medium wave (MW): 2 \u03bcm to 5 \u03bcm<\/p>\n<p>Long waves or thermal waves: 8 \u03bcm to 14 \u03bcm<\/p>\n<p>Far infrared: 14 to 100 \u03bcm<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:10px;width:100%;\"><\/div><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-2 hover-type-none\"><img decoding=\"async\" width=\"1280\" height=\"720\" alt=\"wintech groupe - plage spectrale mat\u00e9riaux optiques\" title=\"Wintech Groupe- Plage spectrale mat\u00e9riaux optiques\" src=\"https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/wintech-groupe-transmission-spectral-range-optical-materials.jpg\" class=\"img-responsive wp-image-11792\"\/><\/span><\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:20px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-13 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Refractive Index of Optical Window Materials<\/h3><\/div><div class=\"fusion-text fusion-text-14\"><p>The refractive index determines how light deflects as it passes through the optical window. This index depends on the material and the wavelength of the light.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:10px;width:100%;\"><\/div><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-3 hover-type-none\"><img decoding=\"async\" width=\"1280\" height=\"720\" alt=\"wintech groupe - indice de r\u00e9fraction mat\u00e9riaux optiques\" title=\"Wintech Groupe &#8211; Indice de r\u00e9fraction mat\u00e9riaux optiques\" src=\"https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/wintech-groupe-refractive-index-optical-window-materials.jpg\" class=\"img-responsive wp-image-11794\"\/><\/span><\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:0px;width:100%;\"><\/div><div class=\"fusion-title title fusion-title-14 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:0.6em;--awb-margin-left-small:0px;\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:26;line-height:0.9;\">Knoop Hardness of Optical Window Materials<\/h3><\/div><div class=\"fusion-text fusion-text-15\"><p>The higher the hardness of an optical material, the higher its mechanical strength or scratch resistance.<\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:10px;margin-bottom:10px;width:100%;\"><\/div><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-4 hover-type-none\"><img decoding=\"async\" width=\"1280\" height=\"720\" alt=\"Wintech Groupe - duret\u00e9 knoop mat\u00e9riaux optiques\" title=\"Wintech Groupe- Duret\u00e9 Knoop mat\u00e9riaux optiques\" src=\"https:\/\/wintech-groupe.com\/wp-content\/uploads\/2024\/02\/wintech-groupe-knoop-hardness-optical-materials.jpg\" class=\"img-responsive wp-image-11796\"\/><\/span><\/div><div class=\"fusion-text fusion-text-16\"><p><span style=\"font-size: 20px;\"><strong><a href=\"https:\/\/wintech-groupe.com\/en\/news\/optical-window-design-manufacturing-process-and-cost\/\">Learn about the manufacturing process of an optical window and its cost.<\/a><\/strong><\/span><\/p>\n<\/div><div class=\"fusion-separator fusion-full-width-sep\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-7 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1331.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-10 fusion_builder_column_1_5 1_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:20%;--awb-margin-top-large:0px;--awb-spacing-right-large:9.6%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:9.6%;--awb-width-medium:20%;--awb-order-medium:0;--awb-spacing-right-medium:9.6%;--awb-spacing-left-medium:9.6%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" 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class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\"><span class=\"hs-cta-node hs-cta-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\" id=\"hs-cta-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\"><!--[if lte IE 8]><div id=\"hs-cta-ie-element\"><\/div><![endif]--><a href=\"https:\/\/hubspot-cta-redirect-eu1-prod.s3.amazonaws.com\/cta\/redirect\/25400659\/42b3ebd6-7dae-4a02-ba76-8a07e39fb292\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-42b3ebd6-7dae-4a02-ba76-8a07e39fb292\" style=\"border-width:0px;\" src=\"https:\/\/hubspot-no-cache-eu1-prod.s3.amazonaws.com\/cta\/default\/25400659\/42b3ebd6-7dae-4a02-ba76-8a07e39fb292.png\"  alt=\"Nouveau call-to-action\"\/><\/a><\/span><script charset=\"utf-8\" src=\"https:\/\/js-eu1.hscta.net\/cta\/current.js\"><\/script><script type=\"text\/javascript\"> hbspt.cta.load(25400659, '42b3ebd6-7dae-4a02-ba76-8a07e39fb292', {\"useNewLoader\":\"true\",\"region\":\"eu1\"}); <\/script><\/span><!-- end HubSpot Call-to-Action Code --><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-12 fusion_builder_column_1_5 1_5 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:20%;--awb-margin-top-large:0px;--awb-spacing-right-large:9.6%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:9.6%;--awb-width-medium:20%;--awb-order-medium:0;--awb-spacing-right-medium:9.6%;--awb-spacing-left-medium:9.6%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article will take you through the specific characteristics of the different optical materials.<\/p>\n","protected":false},"author":3,"featured_media":11807,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Characteristics of optical window materials | Wintech Groupe","_seopress_titles_desc":"This article will take you through the specific characteristics of the different optical 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