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Ultra-High-Vacuum Fiber Feedthrough Flanges


  • Fiber Feedthrough CF and KF40 Flanges for Ultra-High Vacuum
  • SMA Terminated on Both Sides
  • Available for 200 - 1200 nm, 400 - 2400 nm, or 0.3 - 5.5 µm

VC2H2S

CF Flange for
Ø200 µm SMA Fibers

Front

Back

VK4L4S

KF40 Flange for
Ø400 µm SMA Fibers

ADASMAV

Vacuum-Compatible Mating Sleeve

Application Idea

The MV11L05 Vacuum-Compatible Multimode Patch Cable connected to the VK4H1S Fiber Feedthrough KF40 Flange using the ADASMAV Vacuum-Compatible Mating Sleeve. The feedthrough can be can be mated to a vacuum system using a wing nut clamp and an O-ring carrier (not shown).

Related Items


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Fiber Feedthrough Common Specifications
Insertion Loss ≤2.3 dB
Max Optical Power 1 W
Leak Rate ≤1 x 10-10 mbar⋅L/s (Helium Standard)

Features

  • Quickly Connect SMA-Terminated Fibers to a Vacuum Chamber
  • CF (Ø2.75") or KF40 (Ø2.17") Flange Options
  • Hermetically Sealed Multimode Step-Index Fiber
    • Ø100 µm, Ø200 µm, Ø400 µm, or Ø600 µm Core
    • High OH (200 - 1200 nm), Low OH (400 - 2400 nm), or MIR (0.3 - 5.5 µm)
  • Compatible with Thorlabs Vacuum-Compatible Multimode Fiber Optic Patch Cables
  • Bake-Out can be Conducted at High Temperatures
    • Up to 250 °C for High- and Low-OH Fiber
    • Up to 90 °C for MIR Fiber
  • Vacuum-Compatible Mating Sleeve and Flange Mounting Components Sold Below

Thorlabs manufactures Ultra-High-Vacuum Compatible Fiber Feedthroughs for both CF Ø2.75" (DN40) and KF40 flanged systems. These feedthroughs allow for optical coupling into ultra-high-vacuum (UHV) systems using SMA905-terminated fiber patch cables and mating sleeves. Each fiber feedthrough incorporates a hermetically sealed step-index multimode optical fiber in a stainless steel shell, provides a low insertion loss of ≤2.3 dB, and can handle optical powers up to 1 W. The flanges are double vacuum bagged to help prevent contamination when transported into a cleanroom environment.

The fiber feedthroughs feature male SMA905 connectors on both sides; mating sleeves may be used to connect fiber patch cables. For the side of the feedthrough that is inside of the vacuum environment, the ADASMAV vacuum-compatible SMA-to-SMA mating sleeve, available below, can be used to connect a vacuum-compatible patch cable. Constructed using 304 stainless steel, this adapter is designed to be used within ultra-high vacuum systems. Feedthroughs with high- or low-OH fiber feature a Ø0.063" (Ø1.6 mm) hole through the body to serve as a vent, allowing trapped gas to escape. When using fiber patch cables in a vacuum environment, ensure that the cables are vacuum compatible. The mid-IR KF40 flange fiber feedthrough (Item # VK4F1S) has a 17.78" (451.6 mm) long, ruggedized, hermetic, permanently attached, InF3 multimode fiber cable ending in an male SMA905 connector on the side facing away from vacuum.

The high- and low-OH fiber feedthroughs have unique laser-welded joints that provide sturdier construction than traditional adhesives and greatly minimize leak rate. In addition, the locations of these laser welds and the hermetic glass-to-metal seal ensure that only external, easy-to-clean surfaces are directly exposed to the vacuum. Since there is no epoxy on the vacuum side of the feedthrough, there is minimal contamination and gas load on the vacuum system.

Thorlabs also sells additional high-vacuum CF components, KF-flanged component and accessories, as well as an extended line of vacuum-compatible parts.


Click to Enlarge
Click for Data
This attenuation data was calculated as a function of wavelength for the fibers used in the UHV high-OH fiber feedthrough CF and KF40 flanges.

Click to Enlarge
Click for Data
This attenuation data was calculated as a function of wavelength for the fiber used in the MIR fiber feedthrough KF40 flange.

Click to Enlarge
Click for Data
This attenuation data was calculated as a function of wavelength for the fibers used in the UHV low-OH fiber feedthrough CF and KF40 flanges.

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CF Flange Fiber Feedthroughs

Ultra-High Vacuum Fiber Feedthrough CF Flange Cross-Section
Click to Enlarge

Ultra-High Vacuum Fiber Feedthrough CF Flange Cross-Section
  • Construction Enables use at Vacuum Pressures Down to
    1 x 10-10 Torr
  • Mates to Ø2.75" (DN40) CF Flanges
  • Hermetically-Sealed Fiber Tip Limits Virtual Leaks
  • 304 Stainless Steel Construction for High Durability and Low Outgassing
  • Laser Welded Body; Adhesive-Free on Vacuum Side
  • CF Flange Mounting Hardware Pack and Copper Gaskets Sold Below

Our Ultra-High-Vacuum-Compatible Ø2.75" (DN40) Fiber Feedthrough CF Flanges allow for optical coupling into ultra-high-vacuum (UHV) systems using SMA905-terminated fiber patch cables and mating sleeves. Constructed using 304 stainless steel, every feedthrough is designed to be used within UHV systems down to 10-10 Torr.

The CF-style flange utilizes a knife-edge mechanism to create an airtight seal when used properly with a copper gasket (sold below). Six 1/4" (M6) through holes allow the these fiber feedthroughs to be bolted onto any standard DN40 CF flange. As the bolts of the mating pair are tightened, the knife edge bites into the copper gasket, deforming it. The compressed copper fills all the machining marks and surface defects, which yields a leak-tight seal. Please note that the copper gasket and bolts must be purchased separately.

Note: Mounting hardware and CF flange copper gasket seals are not included.

Item # Fiber Core Fiber Wavelength Range NA Maximum Temperature
VC2H1S Ø100 µm High OH 200 - 1200 nm 0.22 ± 0.02 250 °C
VC2L1S Low OH 400 - 2400 nm
VC2H2S Ø200 µm High OH 200 - 1200 nm
VC2L2S Low OH 400 - 2400 nm
VC2H4S Ø400 µm High OH 200 - 1200 nm
VC2L4S Low OH 400 - 2400 nm
VC2H6S Ø600 µm High OH 200 - 1200 nm
VC2L6S Low OH 400 - 2400 nm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VC2H1S Support Documentation
VC2H1SCustomer Inspired! Fiber Feedthrough for Ø2.75" CF Flange, High OH, Ø100 µm Core, 200 - 1200 nm, 0.22 NA, SMA
$412.00
Lead Time
VC2L1S Support Documentation
VC2L1SCustomer Inspired! Fiber Feedthrough for Ø2.75" CF Flange, Low OH, Ø100 µm Core, 400 - 2400 nm, 0.22 NA, SMA
$412.00
Today
VC2H2S Support Documentation
VC2H2SFiber Feedthrough for Ø2.75" CF Flange, High OH, Ø200 µm Core, 200 - 1200 nm, 0.22 NA, SMA
$412.00
Today
VC2L2S Support Documentation
VC2L2SFiber Feedthrough for Ø2.75" CF Flange, Low OH, Ø200 µm Core, 400 - 2400 nm, 0.22 NA, SMA
$412.00
Today
VC2H4S Support Documentation
VC2H4SCustomer Inspired! Fiber Feedthrough for Ø2.75" CF Flange, High OH, Ø400 µm Core, 200 - 1200 nm, 0.22 NA, SMA
$412.00
Today
VC2L4S Support Documentation
VC2L4SCustomer Inspired! Fiber Feedthrough for Ø2.75" CF Flange, Low OH, Ø400 µm Core, 400 - 2400 nm, 0.22 NA, SMA
$412.00
Today
VC2H6S Support Documentation
VC2H6SFiber Feedthrough for Ø2.75" CF Flange, High OH, Ø600 µm Core, 200 - 1200 nm, 0.22 NA, SMA
$412.00
5-8 Days
VC2L6S Support Documentation
VC2L6SFiber Feedthrough for Ø2.75" CF Flange, Low OH, Ø600 µm Core, 400 - 2400 nm, 0.22 NA, SMA
$412.00
Today

KF40 Flange Fiber Feedthroughs

Ultra-High Vacuum Fiber Feedthrough KF40 Flange Cross-Section
Click to Enlarge

This cross-section illustrates the interior of our UHV high- and low-OH fiber feedthrough KF40 flanges.
  • Construction Enables use at Vacuum Pressures Down to 1 x 10-8 Torr
  • Mates to KF40 (Ø2.17") Flanges
  • Hermetically-Sealed Fiber Tip Limits Virtual Leaks
  • 304 Stainless Steel Construction for High Durability and Low Outgassing
  • Laser Welded Body on High- and Low-OH Fiber Feedthroughs
  • High-OH and Low-OH Fiber Feedthroughs Adhesive-Free on Vacuum Side
  • KF40 Flange-Centering O-Ring Carrier and Wing Nut Clamp Sold Below

Our Ultra-High-Vacuum-Compatible Fiber Feedthrough KF40 Flanges allow for optical coupling into ultra-high-vacuum (UHV) systems using SMA905-terminated fiber patch cables and mating sleeves. Constructed using 304 stainless steel, every feedthrough is designed to be used within UHV systems down to 10-8 Torr. Referred to as NW, QF, or DN flanges, KF flanges are ideal for quickly assembling vacuum systems due to their ease of use, maintenance, and reusability. The MIR fiber feedthrough (Item # VK4F1S) has a 17.78" (451.6 mm) long, ruggedized, hermetic, permanently attached, InF3 multimode fiber cable ending in a male SMA905 connector on the side facing away from vacuum.

These KF flanges are ISO-standardized vacuum fittings that can be mated to a vacuum system using a wing nut clamp and an O-ring carrier (sold below). The angled sides of the wing nut clamp compress the O-ring between the flanges, quickly creating a vacuum seal. The wing nut clamp, which has M5 x 0.8 threads, requires only hand tightening, allowing parts to be quickly swapped in and out of a KF-flanged system. Please note that the O-ring carrier and wing nut clamp must be purchased separately.

Item # Fiber Core Fiber Wavelength Range NA Maximum Temperature
VK4H1S Ø100 µm High OH 200 - 1200 nm 0.22 ± 0.02 250 °C
VK4F1S MIR (InF3) 0.3 - 5.5 µm 0.26 ± 0.02 90 °C (Bake Out); 75 °C (Operating)
VK4L1S Low OH 400 - 2400 nm 0.22 ± 0.02 250 °C
VK4H2S Ø200 µm High OH 200 - 1200 nm
VK4L2S Low OH 400 - 2400 nm
VK4H4S Ø400 µm High OH 200 - 1200 nm
VK4L4S Low OH 400 - 2400 nm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VK4H1S Support Documentation
VK4H1SFiber Feedthrough for KF40 Flange, High OH, Ø100 µm Core, 200 - 1200 nm, 0.22 NA, SMA
$412.00
Today
VK4F1S Support Documentation
VK4F1SNEW!Fiber Feedthrough for KF40 Flange, InF3 Multimode Fiber, Ø100 µm Core, 0.3 - 5.5 µm, 0.26 NA, SMA
$1,200.00
Today
VK4L1S Support Documentation
VK4L1SFiber Feedthrough for KF40 Flange, Low OH, Ø100 µm Core, 400 - 2400 nm, 0.22 NA, SMA
$412.00
Today
VK4H2S Support Documentation
VK4H2SFiber Feedthrough for KF40 Flange, High OH, Ø200 µm Core, 200 - 1200 nm, 0.22 NA, SMA
$412.00
Today
VK4L2S Support Documentation
VK4L2SFiber Feedthrough for KF40 Flange, Low OH, Ø200 µm Core, 400 - 2400 nm, 0.22 NA, SMA
$412.00
Today
VK4H4S Support Documentation
VK4H4SFiber Feedthrough for KF40 Flange, High OH, Ø400 µm Core, 200 - 1200 nm, 0.22 NA, SMA
$412.00
5-8 Days
VK4L4S Support Documentation
VK4L4SFiber Feedthrough for KF40 Flange, Low OH, Ø400 µm Core, 400 - 2400 nm, 0.22 NA, SMA
$412.00
5-8 Days

Vacuum-Compatible SMA to SMA Mating Sleeve

Vacuum Compatibility Specifications
Vacuum Compatibility as Packageda 10-10 Torr
Materials 304 Stainless Steel
Preparation and Packaging Chemically Cleaned and Double Vacuum Bagged
Stainless Steel Outgassing Rate at 20 °C 1.8 x 10-8 Torr-Liters/s/cm2
  • Prior to placing any components in a vacuum system, we recommend using an appropriate cleaning procedure, which will be dependent on the application, as well as a pre-baking in a bake-out oven to remove moisture and surface volatiles.
Vacuum SMA Adapter Vent Hole
Click to Enlarge

The ADASMAV has a Ø0.063" (Ø1.6 mm) vent hole.
  • Air-Spaced SMA to SMA Mating Sleeve for Ultra-High-Vacuum Applications
  • Constructed from 304 Stainless Steel
  • <1.5 dB Insertion Loss (Typical Loss for a Pair of Ø200 µm Core Multimode Fibers)
  • Double-Bagged for Cleanroom Environments
  • Compatible with Thorlabs' Vacuum-Compatible Multimode Fiber Optic Patch Cables

Thorlabs' ADASMAV Mating Sleeve is a vacuum-compatible version of the ADASMA SMA to SMA Mating Sleeve. Constructed using 304 stainless steel, this adapter is designed to be used within ultra-high vacuum systems (>10-10 Torr) and features a Ø0.063" (Ø1.6 mm) vent hole in the side to allow trapped gases to escape (see image to the right). Unlike the standard version, the ADASMAV is only compatible with SMA905-style connectors. A 304 stainless steel washer and nut are included for custom mounting.

Additional Vacuum-Compatible Components
Many of our patch cables can be special ordered for vacuum use. Contact Tech Support for details.

Vacuum Compatibility Information
Our vacuum-compatible adapter is chemically cleaned and prepared for vacuum applications before packaging. It is compatible directly out of the packaging with vacuum environments down to 10-10 Torr. With additional cleaning and processing, it can be used at even lower pressures, only limited by the outgassing rate of the stainless steel (see the table above). The material properties of the stainless steel and the cleaning methods completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system. Please note that using caps or panels not rated for vacuum applications with the ADASMAV is not recommended.

We also offer other vacuum-compatible components which may be used in vacuum applications.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
ADASMAV Support Documentation
ADASMAVVacuum-Compatible SMA to SMA Mating Sleeve
$28.95
5-8 Days

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
Lead Time
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

KF40 Flange-Centering O-Ring Carrier and Wing Nut Clamp

Item # Included O-Ring Dimensions
OD ID Thickness
KF40CR-F 2.05" 1.65" 0.20"
  • KF40CR-F Centering O-Ring Carrier for KF40 (Ø2.17") Flanges
    • Holds O-Ring in Place Between KF Flanges
    • Creates Vacuum Seal When Compressed Against KF Mating Surfaces
    • Includes Fluorocarbon O-Ring
  • KF40WNC Wing Nut Clamp for KF40 (Ø2.17") Flanges
    • Secures Two KF40 Flanges Separated by an O-Ring
    • Fast Hand Tightening; No Tools Required

Thorlabs offers a centering O-ring and a wing nut fastening clamp for mating KF40 flanges to a vacuum system. The angled sides of the wing nut clamp compress the O-ring between the flanges, quickly creating a vacuum seal. The wing nut clamp, which has M5 x 0.8 threads, requires only hand tightening, allowing parts to be quickly swapped in and out of a KF-flanged system.

For best performance, a very thin coating of vacuum grease should be applied to the O-ring before installation. This should be done by hand while wearing gloves, leaving just enough grease to cause the O-ring to shine. The O-ring and its mating surfaces should be visually inspected before installation to ensure there is no debris which may impede proper contact and cause a leak. O-rings should be regularly inspected to spot dry rot, cracking, tearing, or accumulation of debris from normal operation. Replace any O-ring that is suspected of causing a leak. Additionally, be aware that under vacuum pressure, the KF connection may undergo additional compression, causing the wing nut clamp to loosen. Some additional tightening may be performed, but be careful not to overtighten the clamp, as the wing nut may become difficult to remove or jammed when the system returns to atmospheric pressure. Do not remove a wing nut clamp while a system is under vacuum.

We also offer KF16 and KF25 flange sizes of wing nut clamps and O-rings.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
KF40CR-F Support Documentation
KF40CR-FCentering O-Ring Carrier for KF40 Flanges with Fluorocarbon O-Ring
$12.20
Today
KF40WNC Support Documentation
KF40WNCWing Nut Clamp for KF40 Flanges
$9.85
Today
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