Vacuum Viewports

Vacuum Viewports

High Vacuum Viewports
Ultra-High Vacuum Viewports

Fused Silica - Glass - Sapphire - Magnesium Fluoride - Calcium Fuoride - Zinc Selenide - BBAR Coated Fused Silica - Corning HPFS Fused Silica - UV Fused Silica - EUV Fused SIlica (Excimer Grade)

Apex Vacuum offers vacuum viewports for applications in high vacuum and ultra-high vacuum (UHV). There are a number of viewport window options  available to cover light wave frequencies required by many photonic applications.  Options such as anti-reflective coatings are available upon request.

The window sizing of vacuum viewports, with provided viewable areas, are available up to 3 inches. Flanges can be weldable, ConFlat (CF) or Quick Flange (NW, KF & QF). Custom capabilities include pressure & temperature options. Vacuum viewports with different optical finishes such as surface polish, flatness, parrallelism, clear aperature, wedge angle, focal length and thickness are also available.

High Vacuum and ultra-high vacuum Viewports

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Kodial Glass

Kodial glass viewports are manufactured from 304 stainless steel and alkali borosilicate 7056. Kodial glass allows for the operator to view a process, make measurements of emissions, and initiate chemical action from a specific wavelength. Usable to temperatures of 200°C.

Viewport Chart                                                                                                                                                                                                                                                                                                  Viewport Chart

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UV Fused Silica

Fused Silica Viewports are available with diameters up to 8 inches and include zero length designs for low profile applications. These are all bakeable to 200˚C. Several standard grades of Fused Silica windows are offered and have excellent transmission from 193nm to 2 microns.

UV Fused Silica Chart

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DUV Fused Silica

Deep (DUV) Fused Silica Viewports are available with diameters up to 8 inches and include zero length designs for low profile applications. These are all bakeable to 200˚C. Several standard grades of Fused Silica windows are offered and have excellent transmission from 193nm to 2 microns.

DUV Fused Silica

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EUV Fused Silica

Eximer (EUV) Fused Silica Viewports are available with diameters up to 8 inches and include zero length designs for low profile applications. These are all bakeable to 200˚C. Several standard grades of Fused Silica windows are offered and have excellent transmission from 193nm to 2 microns.

EUV Fused Silica Excimer Grade

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UV Sapphire

UV Sapphire viewports come with view diameters up to 3 inches, and are bakeable to 450˚C. Single crystal, sapphire windows come with orientation either 0˚ or 90˚ and provide transmission from 250nm to 4 microns.  

UV Sapphire chart

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DUV Sapphire

DUV Sapphire viewports come with view diameters up to 3 inches, and are bakeable to 450˚C. Single crystal, sapphire windows come with orientation either 0˚ or 90˚ and provide transmission from 250nm to 4 microns.  

DUV Sapphire viewport

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Extended Range UHV

Ultra-high Vacuum (UHV) viewports use materials for windows such as Zinc Selenide, Magnesium Fluoride, and Calcium Fluoride. We offer metal sealed (CF Flange), extended-range optics in 1 inch and 2 inch view diameters with a combined range of transmission from 120nm to 20 microns. Coatings which enhance the transmission performance of many of these viewports are offered as standard options.

Extended range optics

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Laser Optics

Laser Optics Fused Silica Viewports pair a specific type of Fused Silica with a precise AR V-Coating specific to your laser wavelength. These viewports are bakeable to 200˚C. We have four standard wavelengths: 193nm, 248nm, 780nm, and 1064nm. If you need a wavelength, please contact Apex Vacuum and we will assist you to get the best performing viewport for your application.

Laser Optics

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BBAR Coated

BBAR Coated Viewports come with view diameters of up to 2.69 inches. Viewports are made from a BBAR Coated HPFS 7980 Fused Silica material. Viewports or vacuum windows can be specified with either 2.75” CF or 4.5 CF flanges.

BBAR Coated Fused Silica

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Differentially Pumped

Differentially Pumped Viewports come with view diameters of up to 1.88 inches, and are bakeable to 200˚C. Viewports are AR Coated Zinc Sulfide (Cleartran™) transmission range 8-12 microns. Viewports or vacuum windows can be specified with either 2.75” CF or 4.5 CF flanges.

Diff Pump viewport

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Non-Magnetic

Our non-magnetic viewport selection includes those manufactured with non-magnetic Stainless Steel or All-Titanium. All connections to the vacuum system are Con-Flat for the best seal. Choices range from 200˚C to 450˚C for bakeout temperatures, depending on glass type and coating (Sapphire or Fused Silica).

UV Fused Silica
UV Sapphire
EUV Fused Silica excimer grade
DUV Fused Silica

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Re-Entrant

Re-entrant Viewports come with view diameters of up to 2.7 inches, and are bakeable to 200˚C. All flange types are ConFlat, and all glass is made from fused silica. The stainless steel re-entrant tube is customizable in length for individual system needs.

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Over-Pressure

Over-pressure protected UHV viewports are tested at 150% of the rated pressure. The maximum overpressure protection offered is 200 psi for Conflat viewports. Sapphire window viewports are designed with more than 10x safety factor and are tested for up to 300 psi.

UV Sapphire

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