Zero Length Viewport, UV Grade Fused Silica, 0.63 Inch Clear Aperture, CF 1.33 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Fused silica is a high quality optics material used by default in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and near infrared (NIR) regions, has high strength and scratch resistance, and resists most chemicals. Specifications: Window Material: Corning HPFS 7980 Fused Silica or Equivalent Flange Material: 304 Stainless Steel Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 0.63" B. Window Thickness: 0.085" C. Flange Thickness: 0.35" D. Flange OD: 1.33" Optical: Transmitted Wavefront Distortion: <10? at 632nm (peak to valley) Parallelism: <30 arcmin Surface Finish: 40/20 Scratch-Dig Homogeneity Grade: F Inclusion Class: 2

Zero Length Viewport, UV Grade Fused Silica, 0.63 Inch Clear Aperture, CF 1.33 Inch, 316 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Fused silica is a high quality optics material used by default in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and near infrared (NIR) regions, has high strength and scratch resistance, and resists most chemicals. 316 stainless steel is one of the least magnetic grades of stainless steel. It has a low magnetic permeability which can prevent distortion of critical magnetic fields such as those used in particle accelerators, electron beam lithography, and electron microscopy. 316 stainless steel also has very high corrosion resistance, higher than 304 stainless steel for most applications. Specifications: Window Material: Corning HPFS 7980 Fused Silica or Equivalent Flange Material: 316 Stainless Steel Magnetic Permeability: <1.01 Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 0.63" B. Window Thickness: 0.085" C. Flange Thickness: 0.35" D. Flange OD: 1.33" Optical: Transmitted Wavefront Distortion: <10? at 632nm (peak to valley) Parallelism: <30 arcmin Surface Finish: 40/20 Scratch-Dig Homogeneity Grade: F Inclusion Class: 2

Zero Length Viewport, UV Grade Sapphire, 0.46 Inch Clear Aperture, CF 1.33 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Sapphire is a premium optics material used in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and infrared regions from 150 nm to 5500 nm. UV grade sapphire has enhanced transparency in the UV compared to standard sapphire. It is extremely hard, has high strength and scratch resistance, and resists most chemicals. Specifications: Window Material: Sapphire Mount Material: Kovar Flange Material: 304 Stainless Steel Thermal Range: -100°C to 450°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 0.46" B. Window Thickness: 0.062" C. Flange Thickness: 0.30" D. Flange OD: 1.33" Optical: Transmitted Wavefront Distortion: <8? at 632nm (peak to valley) Parallelism: <3 arcmin Surface Finish: 50/20 Scratch-Dig Orientation: Random

Zero Length Viewport, DUV Laser Grade Fused Silica, Dual AR Coating at 780 and 1064 nm, 1.42 Inch Clear Aperture, CF 2.75 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. DUV fused silica is a premium optics material with greater purity and better optical properties than UV or standard fused silica grades. It is used when extremely efficient transmission is required, such as high power wavelength applications. This viewport is coated on both sides with antireflection (AR) coatings which suppress reflection at normal incidence of 780 and 1064 nm light to less than 0.25% per surface. 780 nm light is typically generated by high power laser diodes. 1064 nm light is typically produced as the fundamental wavelength of neodymium lasers such as Nd:YAG or Nd:YVO4 lasers. DUV fused silica has high strength and scratch resistance, and resists most chemicals. However, the antireflection coatings are more delicate. These optics should be handled and cleaned with care using gloves, compressed nitrogen, lens paper, and optical grade solvents only. Specifications: Window Material: Corning HPFS 7980 Fused Silica or Equivalent Flange Material: 304 Stainless Steel Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 1.42" B. Window Thickness: 0.125" C. Flange Thickness: 0.50" D. Flange OD: 2.75" Optical: Transmitted Wavefront Distortion:

Zero Length Viewport, Magnesium Fluoride, 0.90 Inch Clear Aperture, CF 2.75 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Magnesium fluoride is a premium optics material used primarily in infrared spectroscopy and imaging, although it can be used in visible and UV applications. It is highly transparent in the ultraviolet (UV), visible, and infrared regions from 130 nm to 6000 nm. It is tough, but not as hard as fused silica, quartz, or sapphire so special care must be taken not to touch or scratch the optic surface during use or cleaning. Magnesium fluoride resists degradation by most chemicals including water. Magnsium fluoride is mildy birefringent. Specifications: Window Material: Single Crystal, Magnesium Fluoride (MgF2) Flange Material: 304 Stainless Steel Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 0.90" B. Window Thickness: 0.098" C. Flange Thickness: 0.50" D. Flange OD: 2.75" Optical: Flatness: < ?/4 at 632nm (peak to valley) Parallelism: < 3 arcmin Surface Finish: 20/10 Scratch-Dig Orientation: 0°

Zero Length Viewport, UV Grade Fused Silica, 2.69 Inch Clear Aperture, CF 4.5 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Fused silica is a high quality optics material used by default in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and near infrared (NIR) regions, has high strength and scratch resistance, and resists most chemicals. Specifications: Window Material: Corning HPFS 7980 Fused Silica or Equivalent Flange Material: 304 Stainless Steel Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 2.69" B. Window Thickness: 0.25" C. Flange Thickness: 0.68" D. Flange OD: 4.50" Optical: Transmitted Wavefront Distortion: <10? at 632nm (peak to valley) Parallelism: <30 arcmin Surface Finish: 40/20 Scratch-Dig Homogeneity Grade: F Inclusion Class: 2

Zero Length Viewport, DUV Laser Grade Fused Silica, Dual AR Coating at 532 and 1064 nm, 2.69 Inch Clear Aperture, CF 4.5 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. DUV fused silica is a premium optics material with greater purity and better optical properties than UV or standard fused silica grades. It is used when extremely efficient transmission is required, such as high power wavelength applications. This viewport is coated on both sides with antireflection (AR) coatings which suppress reflection at normal incidence of 532 and 1064 nm light to less than 0.25% per surface. 532 and 1064 nm light is typically produced as the fundamental wavelength and second harmonic of neodymium lasers such as Nd:YAG or Nd:YVO4 lasers. DUV fused silica has high strength and scratch resistance, and resists most chemicals. However, the antireflection coatings are more delicate. These optics should be handled and cleaned with care using gloves, compressed nitrogen, lens paper, and optical grade solvents only. Specifications: Window Material: Corning HPFS 7980 Fused Silica or Equivalent Flange Material: 304 Stainless Steel Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 2.34" B. Window Thickness: 0.25" C. Flange Thickness: 0.69" D. Flange OD: 4.47" Optical: Transmitted Wavefront Distortion:

Zero Length Viewport, Fused Quartz, 2.69 Inch Clear Aperture, CF 4.5 Inch, 304 Stainless Steel Flange. Pfeiffer P/N ZVQ-250 Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Fused quartz is a high quality optics material used in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and near infrared (NIR) regions, has high strength and scratch resistance, and resists most chemicals. Fused quartz typically has improved transparency in the NIR region and reduced transparency in the UV compared to fused silica. This viewport is from Pfeiffer Vacuum. Specifications: Window Material: Fused Quartz Flange Material: 304 Stainless Steel Thermal Range: -20°C to 200°C Common Dimensions: A. Clear Aperture: 2.69" B. Window Thickness: 0.25" C. Flange Thickness: 0.68" D. Flange OD: 4.50"

Zero Length Viewport, Zinc Selenide, 1.88 Inch Clear Aperture, CF 4.5 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Zinc selenide is a premium optics material used in primarily for infrared spectroscopy and imaging and high power CO2 laser transmission. It is highly transparent in the infrared region from 0.6 µm to 16 µm. While zinc selenide has significant absorption in the visible region, it is transparent enough that a low power visible sight laser may still be used for alignment purposes. Zinc selenide is relatively soft compared to other windows materials so great care must be taken to avoid touching or scratching the optic surface, especially during cleaning. It is resistant to most organic solvents, but can fog if exposed to water and will dissolve in acidic solutions. Specifications: Window Material: Zinc Selenide Flange Material: 304 Stainless Steel Thermal Range: -100°C to 2000°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 1.88" B. Window Thickness: 0.150" C. Flange Thickness: 0.68" D. Flange OD: 4.47" Optical: Transmitted Wavefront Distortion: < ?/2 at 632nm (peak to valley) Parallelism: < 3 arcmin Surface Finish: 40/20 Scratch-Dig

Zero Length Viewport, UV Grade Sapphire, 2.95 Inch Clear Aperture, CF 6 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Sapphire is a premium optics material used in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and infrared regions from 150 nm to 5500 nm. UV grade sapphire has enhanced transparency in the UV compared to standard sapphire. It is extremely hard, has high strength and scratch resistance, and resists most chemicals. Specifications: Window Material: Sapphire Flange Material: 304 Stainless Steel Thermal Range: -100°C to 450°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 2.95" B. Window Thickness: 0.125" C. Flange Thickness: 0.78" D. Flange OD: 5.97" Optical: Transmitted Wavefront Distortion: <8? at 632nm (peak to valley) Parallelism: <3 arcmin Surface Finish: 50/20 Scratch-Dig Orientation: Random

Zero Length Viewport, UV Grade Fused Silica, 7.78 Inch Clear Aperture, CF 10 Inch, 304 Stainless Steel Flange. Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr. Fused silica is a high quality optics material used by default in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and near infrared (NIR) regions, has high strength and scratch resistance, and resists most chemicals. Specifications: Window Material: Corning HPFS 7980 Fused Silica or Equivalent Flange Material: 304 Stainless Steel Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Clear Aperture: 7.78" B. Window Thickness: 0.37" C. Flange Thickness: 0.97" D. Flange OD: 10.00" Optical: Transmitted Wavefront Distortion: <10? at 632nm (peak to valley) Parallelism: <30 arcmin Surface Finish: 40/20 Scratch-Dig Homogeneity Grade: F Inclusion Class: 2

Weld-on (W) Viewport, UV Grade Fused Silica, 1.37 Inch Clear Aperture, 1.5 Inch Diameter, Stainless Steel Flange. Weld on (W) viewports are used for light transmission in ultra-high vacuum applications. The window is brazed or fused to a thin, bent metal tube. The brazed connection is compatible with ultra-high vacuum and the bent metal tube introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer stainless steel flange must be welded onto the final article for a permanent, non-alterable ultra-high vacuum compatible seal. Fused silica is a high quality optics material used by default in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and near infrared (NIR) regions, has high strength and scratch resistance, and resists most chemicals. Specifications: Window Material: Corning HPFS 7980 Fused Silica or Equivalent Flange Material: Stainless Steel Thermal Range: -100°C to 200°C Leak Rate: < 1 x 10-9 atm cc sec-1 of helium Common Dimensions: A. Weld Flange OD: 1.500" B. Clear Aperture: 1.37" C. Max OD: 1.81" D. Internal Distance to Window: 0.64" E. Total Length: 0.85" F. Window Thickness: 0.125" Optical Specs: Transmitted Wavefront Distortion: <10? at 632nm (peak to valley) Parallelism: <30 arcmin Surface Finish: 40/20 Scratch-Dig Homogeneity Grade: F Inclusion Class: 2

Ultra High Vacuum (UHV) Inline Optic Mount, Conflat Flange (CF-2.75 in.), for 1" Optic, 304 SS with Aluminum Retaining Ring. These 1.0” optic mounts are machined into a stainless steel double sided conflat 2.75” flange designed for inline use in Ultra High Vacuum (UHV) systems. The optic may be up to 1.0” OD and up to 0.35” thick. It is held in place with a non-anodized aluminum SM1 retaining ring for easy removal and replacement. The kit includes ¼”-28 socket head screws that accept an IP30 Torx bit, with lengths suitable for mounting to tapped or through-hole flanges. Pair these optic mounts with any of our zero-length UHV compatible viewports to make an UHV optical system.