![\"\"](\"https:\/\/avactec.es\/wp-content\/uploads\/2018\/04\/Allectra-logo.jpg\"){kind=logo}
<\/div>n this section we present the vacuum windows (viewports) from Allectra.
\nFor applications where the user only wants to see what is happening in the vacuum chamber, Kodial (boro-silicate) glass is the best choice as it has a low cost and is available on a wide range of flange types and sizes.
\nFused silica is synthetically made quartz. It is a very pure material with minimal inclusions or bubbles. Viewports made from this material extend the transmission to the Ultra Violet (UV) and near Infra Red (IR) range.
\nThe full range of materials is shown on the right.
\nThe quality of polishing is normally given by two numbers called scratch\/dig. The first one refers to the maximum width of a scratch in \u03bcm, the second gives the diameter of digs or bubble defects in 10 \u03bcm. So, a typical polish of 40\/20 refers to a maximum scratch width of 0.04 mm and a maximum dig diameter of 0.2 mm. Two digs must be separated by minimum 20 mm from each other<\/p>\n\n\t\t<\/div> \n\t<\/div> [\/vc_column][\/vc_row][vc_row no_margin=”true” section_content=”inside_container” no_padding=”true” equal_height=”true” content_position=”bottom” bg_type=”” dima_canvas_style=”” translate_x=”0″ dima_z_index=”0″ animate_item=”” delay_duration=”” delay_offset=”” id=”” class=”” border_color=””][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ delay=”” delay_duration=”” delay_offset=”” width=”1\/1″]
The range of materials is shown below:<\/strong><\/p>\n\n\t\t<\/div> \n\t<\/div> [vc_row_inner bg_type=”” dima_canvas_style=”” translate_x=”0″ dima_z_index=”0″][vc_column_inner delay=”” delay_duration=”” delay_offset=”” translate_x=”0″ dima_z_index=”0″ width=”1\/2″]\n\t Kodial glass.<\/p>\n Sapphire: Standard, UV Grade & DUV Grade.<\/p>\n Fused silica: UV Grade, DUV, EXCIMER Grade, near IR Grade and non- magnetic.<\/p>\n\n\t\t<\/div> \n\t<\/div> [\/vc_column_inner][vc_column_inner delay=”” delay_duration=”” delay_offset=”” translate_x=”0″ dima_z_index=”0″ width=”1\/2″]\n\t Crystal quartz.<\/p>\n Calcium fluoride \/\u00a0Magnesium fluoride.<\/p>\n Zinc selenide.<\/p>\n Beryllium.<\/p>\n\n\t\t<\/div> \n\t<\/div> [\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row no_margin=”true” no_padding=”true” equal_height=”true” bg_type=”” dima_canvas_style=”” translate_x=”0″ dima_z_index=”0″ animate_item=”” delay_duration=”” delay_offset=”” id=”” class=”” border_color=””][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ delay=”” delay_duration=”” delay_offset=”” width=”1\/1″] <\/h1> We can offer standard glass viewports, on CF, KF and ISO-K flanges. The standard glass material used is Kodial (boro-silicate glass). These viewports are for normal visible light; for more demanding applications, we recommend the use of fused silica (quartz).<\/p>\n\n\t\t<\/div> \n\t<\/div> CONTACT US<\/a>[\/vc_column][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ border_style=”solid” delay=”” delay_duration=”” delay_offset=”” width=”1\/3″ id=”” class=”” style=”” css=”.vc_custom_1524230174032{border-top-width: 1px !important;border-right-width: 1px !important;border-bottom-width: 1px !important;padding-top: 4% !important;padding-right: 4% !important;padding-bottom: 4% !important;padding-left: 4% !important;}” border_color=”#eeeeee”] <\/h1> Sapphire has high transmission over wavelengths from 180 nm up to 5500 nm. It is a very rigid material with high bakeout temperatures making sapphire an ideal material for many demanding applications. Allectra offer three qualities:<\/strong> regular grade, UV and Deep UV sizes up to 136 mm view. Broad band or single band coated versions are available on request.<\/p>\n\n\t\t<\/div> \n\t<\/div> CONTACT US<\/a>[\/vc_column][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ delay=”” delay_duration=”” delay_offset=”” width=”1\/3″ id=”” class=”” style=”” css=”.vc_custom_1524249879920{border-top-width: 1px !important;border-right-width: 1px !important;border-bottom-width: 1px !important;padding-top: 4% !important;padding-right: 4% !important;padding-bottom: 4% !important;padding-left: 4% !important;}” border_color=”#eeeeee”] <\/h1> Fused silica is an isotropic material with no crystal orientation. It has an almost flat transmission curve from UV to near IR with more than 90% transmission in the visible range. Three qualities are offered:<\/strong> UV grade (200nm to 2 \u03bcm) \/ DUV grade (200nm to 2 \u03bcm – high purity) and EXCIMER grade (185nm to 2.2 \u03bcm). UV-grade quartz is offered for use with KF flanges. Other fused silica grades are available on request.<\/p>\n\n\t\t<\/div> \n\t<\/div> CONTACT US<\/a>[\/vc_column][\/vc_row][vc_row no_margin=”true” no_padding=”true” equal_height=”true” bg_type=”” dima_canvas_style=”” translate_x=”0″ dima_z_index=”0″ animate_item=”” delay_duration=”” delay_offset=”” id=”” class=”” border_color=””][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ delay=”” delay_duration=”” delay_offset=”” width=”1\/1″] <\/h1> For laser applications, Allectra offers high quality quartz viewports with optimised coatings. All viewports have more than 99.5% transmission\/surface at the given wavelength. A high quality 20\/10 surface finish and a flatness of \u03bb\/4 allow high performance. They are offered on 40 CF flanges with 35 mm view diameter and on 63 CF with 68 mm view diameter.<\/p>\n\n\t\t<\/div> \n\t<\/div> CONTACT US<\/a>[\/vc_column][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ border_style=”solid” delay=”” delay_duration=”” delay_offset=”” width=”1\/3″ id=”” class=”” style=”” css=”.vc_custom_1524230174032{border-top-width: 1px !important;border-right-width: 1px !important;border-bottom-width: 1px !important;padding-top: 4% !important;padding-right: 4% !important;padding-bottom: 4% !important;padding-left: 4% !important;}” border_color=”#eeeeee”] <\/h1> UHV viewports made of special materials are available when other wavelengths than standard glass or quartz are needed. Calcium-fluoride and magnesium-fluoride cover a wide transmission range from UV to infrared down to 20 \u03bcm. With the optional AR coating, higher transmission can be reached.<\/p>\n\n\t\t<\/div> \n\t<\/div> CONTACT US<\/a>[\/vc_column][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ delay=”” delay_duration=”” delay_offset=”” width=”1\/3″ id=”” class=”” style=”” css=”.vc_custom_1524249865294{border-top-width: 1px !important;border-right-width: 1px !important;border-bottom-width: 1px !important;padding-top: 4% !important;padding-right: 4% !important;padding-bottom: 4% !important;padding-left: 4% !important;}” border_color=”#eeeeee”] <\/h1> Re-entrant windows<\/strong> allow optional systems or cameras to be inserted “inside” the vacuum system. Other tube lengths can be offered on request. Differentially-pumped viewports for XHV<\/strong>: These special windows are used typically for Geo-chronology measurements. Two UHV windows are sealed together and can be differentially pumped. Coated Cleartran gives good transmission from 350 nm to the far IR. Beryllium X-rya viewports act as a barrier<\/strong> between the vacuum or inert gas environment inside an X-ray source tube or detector and atmospheric conditions external to the device, while at the same time allowing X-rays to pass through. Standard size is 40 CF with a thickness of 130 \u03bcm and a view diameter of 39 mm.<\/p>\n\n\t\t<\/div> \n\t<\/div> CONTACT US<\/a>[\/vc_column][\/vc_row][vc_row bg_type=”” dima_canvas_style=”” translate_x=”0″ dima_z_index=”0″ animate_item=”” delay_duration=”” delay_offset=”” id=”” class=”” border_color=””][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ delay=”” delay_duration=”” delay_offset=”” width=”1\/1″] Information about each type available <\/mark><\/h4>\n\n\t\t<\/div> \n\t<\/div> [\/vc_column][\/vc_row][vc_row section_content=”outside_container” no_padding=”true” content_position=”top” bg_type=”” dima_canvas_style=”” top_shape_color=”#ffffff” bottom_shape_color=”#ffffff” translate_x=”0″ dima_z_index=”0″ animate_item=”” delay_duration=”” delay_offset=”” id=”” class=”” border_color=”” css=”.vc_custom_1524250706908{border-top-width: 1px !important;border-right-width: 1px !important;border-bottom-width: 1px !important;border-left-width: 1px !important;}”][vc_column bg_type=”” dima_canvas_style=”” min_height=”” translate_x=”0″ dima_z_index=”0″ border_style=”solid” delay=”” delay_duration=”” delay_offset=”” width=”1\/3″ id=”” class=”” style=”” css=”.vc_custom_1524069801001{border-top-width: 1px !important;border-right-width: 1px !important;border-bottom-width: 1px !important;border-left-width: 1px !important;padding-top: 4% !important;padding-right: 4% !important;padding-bottom: 4% !important;padding-left: 4% !important;}” border_color=”#eeeeee”]
<\/p>\n
STANDARD VIEWPORTS<\/h4>\n
![\"alt="Standard](\"https:\/\/avactec.es\/wp-content\/uploads\/2018\/04\/Photo-HD-VPZL_600-e1524243983744.jpg\" "\\"Photo-HD-VPZL_600\\"")
<\/div><\/div>\n\t<\/p>\n
SAPPHIRE VIEWPORTS<\/h4>\n
![\"alt="MIRILLA](\"https:\/\/avactec.es\/wp-content\/uploads\/2018\/04\/SAPPHIRE_VIEWPORT_-600x600.jpg\" "\\"SAPPHIRE_VIEWPORT_\\"")
<\/div><\/div>\n\t<\/p>\n
FUSED SILICA VIEWPORTS<\/h4>\n
![\"alt="FUSED](\"https:\/\/avactec.es\/wp-content\/uploads\/2018\/04\/ARCoatedViewports-2-600x600.png\" "\\"ARCoatedViewports-2\\"")
<\/div><\/div>\n\t<\/p>\n
LASER VIEWPORTS<\/h4>\n
![\"alt="LASER](\"https:\/\/avactec.es\/wp-content\/uploads\/2019\/02\/MIRILLA-PARA-L\u00c1SER-600x600.jpg\" "\\"MIRILLA-PARA-L\u00c1SER\\"")
<\/div><\/div>\n\t<\/p>\n
SPECIAL MATERIAL VIEWPORTS<\/h4>\n
![\"alt="SPECIAL](\"https:\/\/avactec.es\/wp-content\/uploads\/2018\/04\/MIRILLA-DE-MATERIALES-ESPECIALES-1-e1524249994303-600x600.png\" "\\"MIRILLA")
<\/div><\/div>\n\t<\/p>\n
SPECIAL PURPOSE VIEWPORTS<\/h4>\n
![\"alt="SPECIAL](\"https:\/\/avactec.es\/wp-content\/uploads\/2018\/04\/Captura-de-pantalla-2018-04-20-a-las-19.57.05-e1525879143642-600x600.png\" "\\"Captura")
<\/div><\/div>\n\t