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Ultra-High-Vacuum Fiber Feedthrough CF Flanges
CF Flange for
Vacuum-Compatible Mating Sleeve
Flange Mounting Hardware Pack
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This attenuation data was calculated as a function of wavelength for the fibers used in the UHV fiber feedthrough CF flanges.
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Ultra-High Vacuum Fiber Feedthrough CF Flange Cross-Section
Thorlabs' Ultra-High-Vacuum-Compatible Ø2.75" (DN40) Fiber Feedthrough CF Flanges allow for optical coupling into ultra-high-vacuum (UHV) systems down to 10-10 Torr using SMA905-terminated fiber patch cables and mating sleeves. Each 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-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, 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 (>10-10 Torr) and features 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 laser-welded joints of these flanges 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.
The CF-style flange utilizes a knife-edge mechanism to create an airtight seal, allowing for pressures down to 10-10 Torr 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.
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The ADASMAV has a Ø0.063" (Ø1.6 mm) vent hole.
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
We also offer other vacuum-compatible components which may be used in vacuum applications.
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.