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High-Vacuum CF Flange Viewports for Ø1" Windows


  • CF Flange Viewports for High-Vacuum Systems
  • Compatible with Ø1" Flat Windows
  • Sapphire, CaF2, or UV Fused Silica Windows

VC224

Ø1" Flat Window Viewport,
Uncoated CaF2 (180 nm - 8 µm)

Front

VGA10

Annealed Copper Gaskets,
10 Pack

Back

VMH6

Flange Mounting Hardware Pack
(6 Bolts, 6 Nuts, & 12 Washers)

VC22VO

Viton O-Ring

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VC22FL Flange with FiberPort
(SH2S019 Mounting Screws Sold Separately)

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VC22FL Flange with SM1L10 Lens Tube

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VC22FL Flange with Cage Rods and CP33 Cage Plate
Common Vacuum Specifications
Vacuum Level 1 x 10-8 Torr (Max)
Max Temperature 150 °C
Thermal Gradient 20 °C/min (Max)

Features

  • Vacuum Level: 1 x 10-8 Torr (Max)
  • Bake Temperature: 150 °C (Max)
  • Available with One of Three Uncoated Substrates
    • Sapphire for 150 nm - 5.0 μm
    • Calcium Fluoride (CaF2) for 180 nm - 8.0 μm
    • UV Fused Silica for 185 nm - 2.1 μm
  • Flange and Viton O-Ring Also Available Separately
  • Flange Mounting Hardware Pack and Copper Gaskets Sold Below

Thorlabs' high-vacuum-compatible Ø2.75" (DN40) CF Flange Viewports for Ø1" Optics are offered with one of three uncoated window substrates: sapphire (150 nm - 4.5 µm), CaF2 (180 nm - 8.0 µm), or UVFS (185 nm - 2.1 µm). Please see the Graphs tab for transmission data. Additionally these viewports are compatible with our selection of stock Ø1" windows with thicknesses between 4.9 - 5.15 mm. These flanges are not compatible with wedged windows.

Designed for use at high-vacuum (HV) pressures, Thorlabs' CF viewports utilize Viton O-Ring seals to create an air-tight metal/glass seal, allowing for pressures down to 10-8 Torr. The vacuum windows are interchangeable, enabling the user to swap out vacuum windows mounted in our HV CF flanges. Additionally, CF flanges (viewports without vacuum windows) are also available that are also compatible with our Ø1" windows. Before swapping and attempting to install additional windows, please review the procedure outlined in the Window Installation tab above.

Copper gasket and mounting hardware sets for Ø2.75" CF flanges are also available below. Thorlabs also offers HV CF Flange Viewports for Ø1.5" windows and Ø1.5" wedged windows.

Flange Item # VC223 VC225 VC224
Window Materiala Sapphire Calcium Fluoride UV Fused Silica
Window Item # WG31050 WG51050 WG41050
Window Diameter (Unmounted) 1"
Clear Aperture Ø0.71" (Ø18 mm)
Transmitted Wavefront Error @ 633 nm λ λ/8 λ/10
Surface Quality 60-40 Scratch-Dig 20-10 Scratch-Dig
Parallelism <3 arcmin <10 arcsec <5 arcsec
  • Click Link for Detailed Specifications on the Substrate

The graphs below show the transmission of light through uncoated sapphire, calcium fluoride (CaF2), and UV fused silica substrates. Raw data in the Excel format is available by clicking on the links below the graphs.

Sapphire Transmission
Click to Enlarge

Click Here for Raw Data
Calcium Floride Transmission
Click to Enlarge

Click Here for Raw Data
Sapphire Transmission
Click to Enlarge

Click Here for Raw Data
Cleaning the Conflat
Click to Enlarge

Fig. 5: Order of faceplate screw tightening.
Cleaning the Conflat
Click to Enlarge

Fig. 4: Viewport with faceplate aligned over screw holes.
Cleaning the Conflat
Click to Enlarge

Fig. 3: Viewport with top O-ring placed on window.
Cleaning the Conflat
Click to Enlarge

Fig. 2: Viewport with window placed on bottom O-ring.
Cleaning the Conflat
Click to Enlarge

Fig. 1: Viewport with front face removed and O-ring inserted.

Our high-vacuum viewports allow the user to install or swap out windows as they desire, or as experimental conditions demand. Installation of the windows is relatively quick and simple. The following steps describe how to install and change windows in our high-vacuum CF flanges.

Step 1: Inspect the O-ring and seat for pits, scratches, or contamination. Remove any loose debris from the seat using compressed air and then install the O-ring in the seat (see Fig. 1). If necessary, clean the window by following our optics cleaning tutorial.

Step 2: Place the window on top of the O-ring (see Fig. 2) and then place and center the second O-ring on top of the window (see Fig. 3).

Step 3: Set the faceplate on top of the window, lining up the O-ring with the faceplate groove and the six holes in the faceplate with the threaded holes in the flange (see Fig. 4). Do not slide the part across the window surface.

Step 4: Place the six screws in the faceplate holes and use a 5/64" (2.0 mm) hex key to thread them so that they are just making contact with the faceplate.

Step 5: In the order illustrated in Fig. 5, turn each screw a quarter turn, repeating the pattern until the faceplate is tight against the flange.


Posted Comments:
Armindo Oliveira  (posted 2019-10-22 10:32:24.2)
Hello, I intend to use VPCH12-FL with a 1'' Germanium window in a waterproof IR camera prototype. What do you suggest to use as counter flange?
YLohia  (posted 2019-10-24 09:51:57.0)
Hello, thank you for contacting Thorlabs. The VFA275 would be an appropriate flange mounting adapter for the VPCH12-FL.
btyee  (posted 2017-05-12 07:41:16.66)
Is there a good option to integrate a lens (plano-convex) with a CF flange? For VPCH12-FL, it seems that most lenses are simply not thick enough at the edges.
tfrisch  (posted 2017-05-17 04:40:10.0)
Hello, thank you for contacting Thorlabs. Mounting a lens in a conflat is not a common application. Typically the lens would be mounted inside or outside the chamber if necessary. I will contact you directly to discuss mounting solutions such as VFA275.
Joseph.E.Roser  (posted 2017-04-06 15:03:08.223)
I would also be interested in this product in a double-sided CF flange. Is it possible to use a thinner window and two o-rings for a vacuum seal on the chamber side and on the faceplate side of the window?
tfrisch  (posted 2017-04-19 03:51:21.0)
Hello, thank you for contacting Thorlabs. While at low pressures, the pressure differential is the most important quantity, we do not have the necessary equipment to test your unique configuration, and these flanges are designed such that the inside pressure is low and the outside pressure is about 1atm. I will reach out to you to discuss my concerns, but at the very least, there is not an appropriate seat for an O-ring on the reverse side.
vittorgd  (posted 2015-03-24 19:18:38.87)
What are the part numbers for the actual windows provided in the VPCH312, 412, and 512?
jlow  (posted 2015-03-26 11:08:39.0)
Response from Jeremy at Thorlabs: The part numbers are WG31050, WG41050, and WG51050.
mmichan  (posted 2014-05-08 17:52:15.923)
Would you consider making this product in a double CF flange?
besembeson  (posted 2014-05-15 08:44:25.0)
Response from Bweh E at Thorlabs: Thanks for contacting Thorlabs. This is a good suggestion. We will look into this option and I will update you via email regarding this.

High-Vacuum CF Flange Viewports with Ø1" Windows

Flange Mechanical Drawing
Click for Details

Mechanical Drawing of VC22 Series Flanges
  • Ø2.75" CF Viewport with Ø1" Windows
  • Viton O-Ring Metal to Glass Seal
  • Sapphire, CaF2, or UVFS Window Included
  • Clear Aperture: Ø0.71" (Ø18 mm)
  • Not Compatible with Wedged Windows

Thorlabs' Ø2.75" CF flange viewports allow for optical access into high-vacuum (HV) systems down to 10-8 Torr. These are fixed (non-rotating) flanges with Ø1" windows that provide a Ø0.71" (Ø18 mm) clear aperture (CA). Note that the CA is limited by the optic rather than the flange's internal diameter. These viewports have six 1/4" (M6) through holes for bolting onto any standard Ø2.75" CF flange. Please note that mounting hardware is not included. Our HV CF viewports can be purchased with one of three uncoated windows: sapphire, CaF2, or UVFS. Additionally, the provided window may be replaced with any of our Ø1" windows that are 4.9 - 5.15 mm thick.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VC223 Support Documentation
VC223NEW!Ø2.75" CF Flange, 150 nm - 4.5 µm Uncoated Sapphire Window
$222.91
Today
VC225 Support Documentation
VC225NEW!Ø2.75" CF Flange, 180 nm - 8 µm Uncoated CaF2 Window
$228.33
Today
VC224 Support Documentation
VC224NEW!Ø2.75" CF Flange, 185 nm - 2.1 µm Uncoated UVFS Window
$222.91
Today

High-Vacuum CF Flange for Ø1" Optics

  • Ø2.75" CF Flange (Includes One O-Ring)
  • Compatible with Ø1" Windows
  • Not Compatible with Wedged Windows

Thorlabs' Ø2.75" CF flange does not include a window but is compatible with any Thorlabs Ø1" window that is 4.9 to 5.15 mm thick. When combined with the appropriate window, this flange allows for optical access into high-vacuum (HV) systems down to 10-8 Torr. This fixed (non-rotating) flange has six 1/4" (M6) through holes for bolting onto any standard Ø2.75" CF flange. Please note that mounting hardware is not included.

The CF-style flange utilizes a knife-edge mechanism to create an airtight seal between mating pieces. To create the seal, a copper gasket (available below) is most often employed. As the bolts of the mating pair are tightened, the knife edge "bites" into the copper gasket, deforming it. The extruded metal fills any machining marks or surface defects, yielding a leak-tight seal.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VC22FL Support Documentation
VC22FLNEW!Ø2.75" CF Flange for Ø1" Optics
$114.70
Today
VC22VO Support Documentation
VC22VONEW!Viton O-Ring for Ø1" Vacuum Window, Pack of 5
$11.00
Today

CF Flange Copper Gaskets and Mounting Hardware

CF Flange Gasket
Click to Enlarge

VGA10 Copper Gasket Installed on VPCHW42-C Viewport
  • VMH6 Stainless Steel (18-8) Mounting Hardware Set Includes:
    • Six Bolts (Silver-Plated, 1/4"-28 x 1.50", 12-Point Heads)
    • Six Nuts and Twelve Washers
  • Single-Use Copper Gaskets for Forming a Seal Between Ø2.75" CF Flanges
    • 101 Copper Alloy (99.99% Pure), OFHC (Oxygen-Free High Conductivity)
    • VGC10: 1/4-Hard Copper Gaskets
    • VGA10: Annealed Copper Gaskets

Thorlabs offers mounting hardware and single-use copper gaskets for mating Ø2.75" CF flanges. These flanges utilize a knife-edge mechanism to create an airtight seal between mating pieces. To create the seal, a copper gasket is most often employed. As the bolts of the mating pair are tightened, the knife edge bites into the copper gasket, deforming it. The extruded metal fills all the machining marks and surface defects, which yields a leak-tight seal.

1/4-hard and annealed copper gaskets are sold in sets of 10. We recommend the 1/4-hard copper gaskets for most applications; for more delicate devices, such as viewports, we recommend using the softer annealed copper gaskets to lower the chance of deformation in the optic due to stress in the flange. The set of stainless steel mounting hardware includes six silver-plated bolts, six nuts, and twelve washers. The silver plating on the bolts acts as a lubricant to prevent galling between the stainless steel surfaces of the bolt and the nut.

Instructions
First ensure the knife-edge mating surfaces of the CF flanges are free from debris or scratches. Then choose the desired bolt hole orientation and insert the gasket, aligning leak-test grooves on the flanges if present. Slide a washer onto the bolt, insert the bolt through the flanges, and add another washer before screwing on the nut. Hand tighten each bolt, then use two wrenches to hold the bolt head and turn the nut. Tighten the nuts gradually in 1/8 to 1/4 turn increments in an alternating crisscross star pattern until the desired tightness is reached. Following these steps will result in a reliable seal with even gasket compression and deformation.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VMH6 Support Documentation
VMH6Mounting Hardware for CF Flanges: 6 Silver-Plated Bolts, 6 Nuts, 12 Washers
$17.51
Today
VGC10 Support Documentation
VGC101/4-Hard OFHC 99.99% Pure Copper Gaskets for Ø2.75" CF Flange, 10 Pack
$41.20
Today
VGA10 Support Documentation
VGA10Annealed OFHC 99.99% Pure Copper Gaskets for Ø2.75" CF Flange, 10 Pack
$92.70
Today
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