Vacuum Viewports

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Optical windows mounted in flanges specially designed for optical access into vacuum systems. The type of flange will determine the vacuum level that can be reached. Learn More

Product	Diameter	Wavelength Range	Substrate	Availability	Price (USD)
Vacuum Viewport	38.1 mm (1.5")	650 - 1050 nm	UV Fused Silica	In stock	$ 173.44
Product Code Wavelength Range 650 - 1050 nm Coating BBAR (650 - 1050 nm) Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	1050 - 1700 nm	UV Fused Silica	2 weeks	$ 305.29
Product Code Wavelength Range 1050 - 1700 nm Coating BBAR (1050 - 1700 nm) Reflectance < 0.5% (1050 - 1700 nm, Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4.04 mm (Mount, Window) Parallelism < 5'' Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Damage Threshold Pulsed 7.5 J/cm² (0.189 mm, 10 ns, 10 Hz, 1542 nm) Transmitted Wavefront Error λ/8 (633 nm) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	195 - 2100 nm	UV Fused Silica	Contact Supplier	$ 267.29
Product Code Wavelength Range 195 - 2100 nm Coating Uncoated Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4.04 mm (Mount, Window) Parallelism < 5'' Substrate UV Fused Silica Applications High-Vacuum Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Transmitted Wavefront Error λ/8 (633 nm) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5")	1050 - 1700 nm	UV Fused Silica	In stock	$ 173.44
Product Code Wavelength Range 1050 - 1700 nm Coating BBAR (1050 - 1700 nm) Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	1050 - 1700 nm	UV Fused Silica	2 weeks	$ 336.19
Product Code Wavelength Range 1050 - 1700 nm Coating BBAR (1050 - 1700 nm) Reflectance < 0.5% (1050 - 1700 nm, Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4 mm (Mount, Window) Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Wedge 30' Damage Threshold Pulsed 7.5 J/cm² (0.189 mm, 10 ns, 10 Hz, 1542 nm) Wedge Tolerance ±10' Surface Irregularity λ/2 (633 nm, Flatness) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	195 - 2100 nm	UV Fused Silica	Contact Supplier	$ 298.17
Product Code Wavelength Range 195 - 2100 nm Coating Uncoated Reflectance < 0.5% (Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4 mm (Mount, Window) Substrate UV Fused Silica Applications High-Vacuum Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Wedge 30' Wedge Tolerance ±10' Surface Irregularity λ/2 (633 nm, Flatness) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5")	350 - 700 nm	UV Fused Silica	In stock	$ 193.64
Product Code Wavelength Range 350 - 700 nm Coating BBAR (350 - 700 nm) Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Wedge 30' Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5")	350 - 700 nm	UV Fused Silica	In stock	$ 173.44
Product Code Wavelength Range 350 - 700 nm Coating BBAR (350 - 700 nm) Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	650 - 1050 nm	UV Fused Silica	In stock	$ 305.29
Product Code Wavelength Range 650 - 1050 nm Coating BBAR (650 - 1050 nm) Reflectance < 0.5% (650 - 1050 nm, Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4.04 mm (Mount, Window) Parallelism < 5'' Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Damage Threshold Pulsed 0.246 J/cm² (0.166 mm, 99 fs, 1 kHz, 800 nm) 7.5 J/cm² (0.133 mm, 10 ns, 10 Hz, 810 nm) Transmitted Wavefront Error λ/8 (633 nm) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	245 - 400 nm	UV Fused Silica	In stock	$ 318.36
Product Code Wavelength Range 245 - 400 nm Coating BBAR (245 - 400 nm) Reflectance < 0.5% (245 - 400 nm, Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4 mm (Mount, Window) Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Wedge 30' Damage Threshold Pulsed 5 J/cm² (0.35 mm, 10 ns, 10 Hz, 355 nm) Wedge Tolerance ±10' Surface Irregularity λ/2 (633 nm, Flatness) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	245 - 400 nm	UV Fused Silica	Contact Supplier	$ 286.29
Product Code Wavelength Range 245 - 400 nm Coating BBAR (245 - 400 nm) Reflectance < 0.5% (245 - 400 nm, Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4 mm (Mount, Window) Parallelism < 5'' Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Damage Threshold Pulsed 5 J/cm² (0.35 mm, 10 ns, 10 Hz, 355 nm) Transmitted Wavefront Error λ/8 (633 nm) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	350 - 700 nm	UV Fused Silica	Contact Supplier	$ 336.19
Product Code Wavelength Range 350 - 700 nm Coating BBAR (350 - 700 nm) Reflectance < 0.5% (350 - 700 nm, Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4 mm (Mount, Window) Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Wedge 30' Damage Threshold Pulsed 7.5 J/cm² (0.491 mm, 10 ns, 10 Hz, 532 nm) Wedge Tolerance ±10' Surface Irregularity λ/2 (633 nm, Flatness) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window)	650 - 1050 nm	UV Fused Silica	2 weeks	$ 336.19
Product Code Wavelength Range 650 - 1050 nm Coating BBAR (650 - 1050 nm) Reflectance < 0.5% (650 - 1050 nm, Average) Diameter 38.1 mm (1.5") 69.85 mm (2.75", Flange) 38.1 mm (1.5", Unmounted, Window) Dimensions Ø 38.1 mm (1.5") Thickness 4 mm (Mount, Window) Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Clear Aperture > Ø 28.7 mm (1.13") Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.1 mm Thickness Tolerance ±0.2 mm Wedge 30' Damage Threshold Pulsed 0.246 J/cm² (0.166 mm, 99 fs, 1 kHz, 800 nm) 7.5 J/cm² (0.133 mm, 10 ns, 10 Hz, 810 nm) Wedge Tolerance ±10' Surface Irregularity λ/2 (633 nm, Flatness) Shape Round Window Material UV Fused Silica Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5")	245 - 400 nm	UV Fused Silica	In stock	$ 193.64
Product Code Wavelength Range 245 - 400 nm Coating BBAR (245 - 400 nm) Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Wedge 30' Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5")	650 - 1050 nm	UV Fused Silica	Contact Supplier	$ 193.64
Product Code Wavelength Range 650 - 1050 nm Coating BBAR (650 - 1050 nm) Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Wedge 30' Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5")	195 - 2100 nm	UV Fused Silica	In stock	$ 167.48
Product Code Wavelength Range 195 - 2100 nm Coating Uncoated Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Wedge 30' Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	50.8 mm (2")	245 - 400 nm (Coating Range)	UV Fused Silica	In stock	$ 203.82
Product Code Wavelength Range 245 - 400 nm (Coating Range) Coating BBAR (245 - 400 nm) Reflectance < 0.5% (245 - 400 nm, Average) Diameter 50.8 mm (2") Dimensions Ø 50.8 mm (2") Thickness 12 mm Substrate UV Fused Silica Coating Features Broadband Clear Aperture > Ø 45.7 mm Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.2 mm Thickness Tolerance ±0.1 mm Wedge 30' Damage Threshold Pulsed 5 J/cm² (0.35 mm, 10 ns, 10 Hz, 355 nm) Wedge Tolerance ±10' Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	50.8 mm (2")	1050 - 1700 nm (Coating Range)	UV Fused Silica	In stock	$ 199.16
Product Code Wavelength Range 1050 - 1700 nm (Coating Range) Coating BBAR (1050 - 1700 nm) Reflectance < 0.5% (1050 - 1700 nm, Average) Diameter 50.8 mm (2") Dimensions Ø 50.8 mm (2") Thickness 12 mm Substrate UV Fused Silica Coating Features Broadband Clear Aperture > Ø 45.72 mm Surface Quality 20-10 scratch-dig Diameter Tolerance +0/-0.2 mm Thickness Tolerance ±0.1 mm Wedge 30' Damage Threshold Pulsed 7.5 J/cm² (0.189 mm, 10 ns, 10 Hz, 1542 nm) Wedge Tolerance ±10' Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	38.1 mm (1.5")	1050 - 1700 nm	UV Fused Silica	In stock	$ 193.64
Product Code Wavelength Range 1050 - 1700 nm Coating BBAR (1050 - 1700 nm) Diameter 38.1 mm (1.5") Dimensions Ø 38.1 mm (1.5") Substrate UV Fused Silica Applications High-Vacuum Coating Features Broadband Wedge 30' Shape Round Supplier Location New Jersey, USA See product details More from Thorlabs
Vacuum Viewport	69.85 mm (2.75", Flange) 25.4 mm (1", Unmounted, Window)	200 - 7000 nm	Calcium Fluoride	Contact Supplier	$ 250.65
Product Code Wavelength Range 200 - 7000 nm Coating Uncoated Diameter 69.85 mm (2.75", Flange) 25.4 mm (1", Unmounted, Window) Dimensions Ø 69.85 mm (2.75") Parallelism < 10'' Substrate Calcium Fluoride Applications High-Vacuum Clear Aperture Ø 18 mm (0.71") Surface Quality 20-10 scratch-dig Transmitted Wavefront Error λ/8 (633 nm) Shape Round Window Material Calcium Fluoride Supplier Location New Jersey, USA See product details More from Thorlabs