Vacuum Optics Catalogue - March 2022

Differentially-pumped Viewports
Specification
Seal Type
Maximum
Temperature
Kalrez® O-ring
250 °C
Minimum Temperature minus 20 °C
Differentially-pumped
Viewports
Maximum Rate of
Temperature Change
Leak Rate
Pressure range
3 °C per minute
<1x10 -10 atm-cc/sec (He)
1 bar to 1x10 -11 mbar
Surface quality 60/40 scratch/dig
Flatness <2λ
TSL differentially-pumped o-ring sealed viewports are the ideal choice when optical flatness is
important. Kalrez o-rings are offered as standard, allowing a maximum temperature of 250 °C,
with alternative o-ring materials available on request. 304L stainless steel CF flange with anodised
aluminium retainer is offered as standard with 316LN flanges available as a non-magnetic option.
CF and KF flanges and VCR fittings are available choices for the pumping port.
TSL is pleased to offer an industry-leading choice of optics in its differentially-pumped viewports.
Popular choices include fused silica, sapphire, natural quartz, ZnSe, Cleartran, CaF2, MgF2, BaF2, LiF,
CSi, KBr and KRS5; requests for other optic materials are welcomed.
Anti-reflective coatings to match customer reflectance requirements are also processed at TSL
and can be applied to differentially-pumped viewports. Please advise the wavelengths or ranges
required for your application when enquiring.
Diaphragm pumps for differential-pumping are also supplied by TSL, along with a range of
pumping lines, bolt-up kits and annealed gaskets.
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