Vacuum Optics ❯ Viewports ❯ UV grade brazed fused silica zero length viewports
UV grade brazed fused silica zero length viewports
Seal Type: Braze
Maximum Temperature: CF version: 200 °C, KF & ISO versions: 150 °C
Minimum Temperature: -20 °C
Maximum Rate of Temperature Change: 3 °C per minute
Leak Rate: <1×10 -10 mbar L/s (He)
Pressure Range: 1 bar to 1×10 -11 mbar
Surface Quality: 20/10 scratch/dig
Parallelism: < 3 arc minutes
Flatness: See the table below
Laser Damage Threshold: CW Continuous Wave – 500 W/cm2 at 530 nm
Pulsed 2 J/cm2 at 530 nm and 10ns pulse width
(note, varies with wavelength, pulse width, laser type and cleanliness of optic)
Flange Material: CF version: 304L, 316LN
KF & ISO versions: 304L
Our UV grade Fused Silica Zero Length Viewports are offered in Conflat® (CF), ISO and KF flange styles. The viewports comprise a high purity laser quality fused silica optic with precise flatness, parallelism, scratch and dig specifications. The ultra‑high vacuum (UHV) CF versions are offered using 304L or 316LN stainless steel and titanium grade 2 flanges. Non‑magnetic viewports are offered for low energy applications or surface science applications needing low magnetic fields. The non‑magnetic viewports use a non‑magnetic weld ring instead of the regular kovar weld ring. Flanges in 304L stainless steel are used for the high vacuum KF and ISO viewports. TSL viewports are manufactured in cleanroom conditions and helium leak tested, cleaned and packed to UHV standards. The construction of the fused silica viewports allows repeated bake‑out with UHV performance, whilst the window offers broadband optical transmission through deep UV, visible to near infra‑red.
UV Grade Fused Silica Zero Length Viewports are also available with various anti‑reflective coatings to match customer reflectance requirements are processed at TSL and available as options listed in the Anti‑Reflective Coatings page.
Laser viewports with a VAR, BBAR and AR coating optimised for specific customer specified laser wavelength, reducing reflectance to below 0.5% per face, are also offered.
Non‑standard viewports can be manufactured on request, including entrant and re‑entrant style microscope/camera viewports.
Annealed copper gaskets and other component accessories are also supplied by TSL.
Brazing imparts stress between the optic and the metal carrier. This manifests itself in the optic changing shape, resulting in the optic’s flatness pre-brazing being reduced post-brazing.
However, the effects of reducing the flatness does not have a significant impact on the transmitted wavefront error.
| Our flanges may have a different name for you: | |||
|---|---|---|---|
| CF | DN | ICF | |
| KF | ISO-KF | NW | QF |
| ISO | LF | LFB | MF |
Fused silica transmission curve
Compare the popular vacuum optics materials and their transmission
Downloadable PDF posters
Fused Silica is not for you?
Please see our other viewports, such as Kodial borosilicate glass, sapphire,
magnesium fluoride (MgF2), calcium fluoride (CaF2), barium fluoride (BaF2), zinc selenide (ZnSe),
CVD diamond or natural z‑cut quartz and more.
CF viewports
| Part Number | Flange Type | Flange OD | View Diameter | Optic Thickness | Flange Material | Weld Ring Material | Flatness @ 632.8nm (*) | Max Temp | Download 2D | Download STEP File |
|---|---|---|---|---|---|---|---|---|---|---|
| VPZ16Q | NW16CF | 34 mm 1.33" | 15 mm 0.60" | 1.5 mm 0.06" | 304L | Kovar | λ/8 | 200°C | Drawing coming soon | VPZ16Q Coming soon |
| VPZ16Q-LN | NW16CF | 34 mm 1.33" | 15 mm 0.60" | 1.5 mm 0.06" | 316LN | Kovar | λ/8 | 200°C | Drawing coming soon | VPZ16Q-LN Coming soon |
| VPZ16Q-NM | NW16CF | 34 mm 1.33" | 15 mm 0.60" | 1.5 mm 0.06" | 316LN | Non-Magnetic | λ/8 | 200°C | Drawing coming soon | VPZ16Q-NM Coming soon |
| VPZ16LAQ | NW16CF | 34 mm 1.33" | 15.5 mm 0.62" | 1.5 mm 0.06" | 304L | Kovar | λ/8 | 200°C | Drawing coming soon | VPZ16LAQ Coming soon |
| VPZ16LAQ-LN | NW16CF | 34 mm 1.33" | 15.5 mm 0.62" | 1.5 mm 0.06" | 316LN | Kovar | λ/8 | 200°C | Drawing coming soon | VPZ16LAQ-LN Coming soon |
| VPZ38Q | NW35CF | 70 mm 2.75" | 32 mm 1.26" | 3 mm 0.12" | 304L | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ38Q Coming soon |
| VPZ38Q-LN | NW35CF | 70 mm 2.75" | 32 mm 1.26" | 3 mm 0.12" | 316LN | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ38Q-LN Coming soon |
| VPZ38Q-NM | NW35CF | 70 mm 2.75" | 32 mm 1.26" | 3 mm 0.12" | 316LN | Non-Magnetic | λ/2 | 200°C | Drawing coming soon | VPZ38Q-NM Coming soon |
| VPZ38LAQ | NW35CF | 70 mm 2.75" | 38 mm 1.50" | 3.5 mm 0.14" | 304L | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ38LAQ Coming soon |
| VPZ38LAQ-LN | NW35CF | 70 mm 2.75" | 38 mm 1.50" | 3.5 mm 0.14" | 316LN | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ38QLA-LN Coming soon |
| VPZ64Q | NW63CF | 114 mm 4.5" | 63 mm 2.49" | 4.5 mm 0.18" | 316LN | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ64Q Coming soon |
| VPZ64Q-LN | NW63CF | 114 mm 4.5" | 63 mm 2.49" | 4.5 mm 0.18" | 304L | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ64Q-LN Coming soon |
| VPZ64Q-NM | NW63CF | 114 mm 4.5" | 63 mm 2.49" | 4.5 mm 0.18" | 316LN | Non-Magnetic | λ/2 | 200°C | Drawing coming soon | VPZ64Q-NM Coming soon |
| VPZ100Q | NW100CF | 152 mm 6.0" | 89 mm 3.51" | 6 mm 0.24" | 304L | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ100Q Coming soon |
| VPZ100Q-LN | NW100CF | 152 mm 6.0" | 89 mm 3.51" | 6 mm 0.24" | 316LN | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ100Q-LN Coming soon |
| VPZ100Q-NM | NW100CF | 152 mm 6.0" | 89 mm 3.51" | 6 mm 0.24" | 316LN | Non-Magnetic | λ/2 | 200°C | Drawing coming soon | VPZ100Q-NM Coming soon |
| VPZ150Q | NW150CF | 203 mm 8.0" | 136 mm 5.36" | 9.5 mm 0.38" | 304L | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ150Q Coming soon |
| VPZ150Q-LN | NW150CF | 203 mm 8.0" | 136 mm 5.36" | 9.5 mm 0.38" | 316LN | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ150Q-LN Coming soon |
| VPZ150Q-NM | NW150CF | 203 mm 8.0" | 136 mm 5.36" | 9.5 mm 0.38" | 316LN | Non-Magnetic | λ/2 | 200°C | Drawing coming soon | VPZ150Q-NM Coming soon |
| VPZ200Q | NW200CF | 254 mm 10.0" | 136 mm 5.36" | 9.5 mm 0.38" | 304L | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ200Q Coming soon |
| VPZ200Q-183 | NW200CF | 254 mm 10.0" | 183 mm 7.21" | 10 mm 0.40" | 304L | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ200Q-183 Coming soon |
| VPZ200Q-183-LN | NW200CF | 254 mm 10.0" | 183 mm 7.21" | 10 mm 0.40" | 316LN | Kovar | λ/2 | 200°C | Drawing coming soon | VPZ200Q-183-LN Coming soon |
(*) – Note flatness of optic given before brazing.
KF viewports
| Part Number | Flange Type | Flange OD | View Diameter | Optic Thickness | Flange Material | Weld Ring Material | Flatness @ 632.8nm (*) | Max Temp | Download 2D | Download STEP File |
|---|---|---|---|---|---|---|---|---|---|---|
| KVPZ16Q | KF16 | 30 mm 1.20" | 15 mm 0.60" | 1.5 mm 0.06" | 304L | Kovar | λ/8 | 150°C | Drawing coming soon | KVPZ16Q Coming soon |
| KVPZ25Q-16LA | KF25 | 40 mm 1.60" | 15.5 mm 0.62" | 1.5 mm 0.06" | 304L | Kovar | λ/8 | 150°C | Drawing coming soon | KVPZ25Q-16LA Coming soon |
| KVPZ40-32Q | KF40 | 55 mm 2.20" | 32 mm 1.26" | 3 mm 0.12" | 304L | Kovar | λ/2 | 150°C | Drawing coming soon | KVPZ40/32Q Coming soon |
| KVPZ40Q | KF40 | 55 mm 2.20" | 38 mm 1.50" | 3.5 mm 0.14" | 304L | Kovar | λ/2 | 150°C | Drawing coming soon | KVPZ40Q Coming soon |
| KVPZ50Q | KF50 | 75 mm 3.00" | 38 mm 1.50" | 3.5 mm 0.14" | 304L | Kovar | λ/2 | 150°C | Drawing coming soon | KVPZ50Q Coming soon |
(*) – Note flatness of optic given before brazing.
ISO viewports
| Part Number | Flange Type | Flange OD | View Diameter | Optic Thickness | Flange Material | Weld Ring Material | Flatness @ 632.8nm (*) | Max Temp | Download 2D | Download STEP File |
|---|---|---|---|---|---|---|---|---|---|---|
| ISO63QVPZ | ISO63 | 95 mm 3.80" | 38 mm 1.50" | 3.5 mm 0.14" | 304L | Kovar | λ/2 | 150°C | Drawing coming soon | ISO63QVPZ Coming soon |
| ISO100QVPZ | ISO100 | 130 mm 5.20" | 63 mm 2.49" | 4.5 mm 0.18" | 304L | Kovar | λ/2 | 150°C | Drawing coming soon | ISO100QVPZ Coming soon |
| ISO160QVPZ | ISO160 | 180 mm 7.10" | 89 mm 3.51" | 6 mm 0.24" | 304L | Kovar | λ/2 | 150°C | Drawing coming soon | ISO160QVPZ Coming soon |
(*) – Note flatness of optic given before brazing.
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