Vacuum Optics Catalogue - March 2022

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Fused Silica Re-Entrant ViewportsSpecificationSeal TypeMaximumTemperatureBraze200 °CMinimum Temperature minus 20 °CMaximum Rate ofTemperature Change3 °C per minuteFused SilicaRe-EntrantViewportsTorr Scientific fused silica re-entrant viewports are typically used for inserting microscopes or camerasin to UHV/Vacuum systems. The re-entrant viewports are offered in CF flanges as standard, butcustom designed viewports can be manufactured using ISO and KF flange styles on request. Theviewports comprise a high purity laser quality fused silica optic with precise flatness, parallelism,scratch and dig specifications which are vacuum brazed in to a kovar weld ring to form an opticassembly. The optic assemblies are TIG welded in to the tube assembly and are helium leak testedand cleaned for ultra high vacuum (UHV) conditions. The CF versions are offered using 304L stainlesssteel flanges, but 316LN flanges can be offered on request. The rugged construction of thefused silica viewports allows repeated bake-out with UHV performance, whilst the window offersbroadband optical transmission through deep UV, visible to near infra-red. Various anti-reflectivecoatings to match customer reflectance requirements are processed at TSL and available as options.Laser viewports with a VAR coating optimised for specific customer specified laser wavelength,reducing reflectance to below 0.5% per face, are also offered. Please advise the wavelength orwavelength ranges of your application and a reflectance curve will be prepared. Annealed coppergaskets and other component accessories are also supplied by TSL. Please contact Torr Scientific ifyou require a quotation for a re-entrant viewport with a different length or different dimensions.Transmission Curve - Fused SilicaLeak RatePressure RangeSurface QualityFlatness<1x10 -10 atm-cc/sec (He)1 bar to 1x10 -11 mbar20/10 scratch/dig< 8λPlease note that the optical transmission curves are approximations and should be used for reference only18Copyright ©www.torrscientific.co.ukSkip to Contents
Fused Silica Re-Entrant ViewportsFused SilicaRe-EntrantViewportsPart Number Flange Type A(mm)B(mm)C(mm)D(mm)E(mm)MaterialVPR38-111-Q NW35CF 70 15 22.2 18.2 111 304L KovarVPR64-138-Q NW63CF 114 32 50.8 47.5 138 304L KovarVPR64/38-80-Q NW63CF 114 32 50.8 47.5 80 304L KovarVPR100-201-Q NW100CF 152 63 89 83 201 304L KovarVPR150-330-Q NW150CF 203 63 108 102 330 304L KovarWeld RingMaterialwww.torrscientific.co.uk 19Skip to ContentsCopyright ©
Page 2 and 3: Issue March 20222Copyright ©www.to
Page 4 and 5: ContentsCompany Introduction ......
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Page 8 and 9: FacilitiesFacilitiesAll brazed and
Page 10 and 11: Product IntroductionViewportsTorr S
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Page 14 and 15: Fused Silica Zero Length ViewportsF
Page 16 and 17: Bonded Fused Silica Zero Length Vie
Page 20 and 21: Kodial Zero Length ViewportsSpecifi
Page 22 and 23: Kodial Zero Length Viewports with I
Page 24 and 25: Kodial Zero Length Viewportswith X-
Page 26 and 27: Kodial Zero Length Viewports withIT
Page 28 and 29: Non-Magnetic Kodial Zero Length Vie
Page 30 and 31: Kodial Re-Entrant ViewportsSpecific
Page 32 and 33: 200°C Sapphire Zero Length Viewpor
Page 34 and 35: High Temperature Sapphire Zero Leng
Page 36 and 37: Zinc Selenide Zero Length Viewports
Page 38 and 39: Magnesium Fluoride Zero Length View
Page 40 and 41: Calcium Fluoride Zero Length Viewpo
Page 42 and 43: Barium Fluoride Zero Length Viewpor
Page 44 and 45: CVD Diamond UHV ViewportsSpecificat
Page 46 and 47: Quartz Natural Z-Cut Zero Length Vi
Page 48 and 49: Differentially-pumped ViewportsSpec
Page 50 and 51: Fused Silica UHV Laser Viewportswit
Page 52 and 53: Fused Silica UHV Viewportswith Anti
Page 54 and 55: Fused Silica UHV Viewportswith Broa
Page 56 and 57: Fused Silica UHV Viewportswith ‘W
Page 58 and 59: Kodial Zero Length Viewportswith An
Page 60 and 61: Kodial Zero Length Viewportswith Br
Page 62 and 63: Kodial Zero Length Viewportswith
Page 64 and 65: Kodial Zero Length Viewportswith
Page 66 and 67: Sapphire viewports with Anti-Reflec
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Sapphire viewports withBroadband An
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Sapphire viewports with‘VAR’ An
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AR CoatedZinc Selenide ZeroLength V
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AR Coated Zinc Selenide Zero Length
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Glass to Metal SealsCF Tubulated Ko
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KF and ISO Centering RingsSpecifica
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CF Copper GasketsSpecificationMater
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Clamps and FastenersKF Swing Clamps
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Atom Trap ChambersSpecificationBody
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Viewport ShuttersFeaturesManual or
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OpticsFused SilicaFused Silica is a
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Attenuation Filter WheelsSpecificat
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CVD DiamondSpecificationTolerance o
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Ceramic BreaksSpecificationSeal Typ
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UHV CF RHEED ScreensCF ViewportCF V
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IndexPart NumberATC-10PC 89ATC-10PU
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IndexPart NumberKVPZ50QWAR 57KVPZ50
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IndexPart NumberVPZ150WAR-LN 65VPZ1
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118Copyright ©www.torrscientific.c
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Vacuum Optics Catalogue - March 2022

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