Fiber optic connection feedthrough

vacuummultiple-elementsingle-element

Overview
The optical fiber vacuum feedthrough provides a stable, repeatable optical interface between a vacuum chamber and the ambient side. It accepts standard optical connector feedthrough heads (e.g., SMA, FC) and mounts directly to chamber flanges via a standard 3/16" × 1/2" vacuum-side thread. Each fiber is rigidly fixed to the sapphire vacuum-window flange by a metal-sealed feedthrough head to maintain precise end-face positioning and stable alignment, minimizing optical attenuation in UHV and high-vacuum environments.

Main advantages

• Compact, mechanically robust design suitable for laboratory and industrial vacuum systems
• Precise, repeatable positioning of fiber end-face relative to sapphire window, reducing insertion loss
• Available in single and multi-channel configurations (1, 2, 4 channels)
• Compatible with common vacuum flanges (KF, CF, ISO) and quick-connect options
• CF (metal-sealed) UHV version supports bake-out up to 450°C for ultra-high vacuum processing
• Clamping-screw fixation ensures long-term alignment stability during experiments and production use

Typical applications

• Spectroscopy and laser coupling
• Optical metrology and vacuum-compatible sensors
• Vacuum system diagnostics and fiber-coupled instrumentation
• R&D in physics and materials laboratories
• Industrial online optical monitoring in vacuum processes

Ordering and integration notes

• When ordering, specify flange type (KF/CF/ISO), number of channels, and connector termination (e.g., SMA, FC)
• Choose the CF (UHV) metal-sealed version for ultra-high vacuum and processes requiring bake-out to 450°C
• Custom mechanical interfaces and installation kits are available to adapt to nonstandard chamber geometries

FAQ

• Q: What is an optical fiber vacuum feedthrough and how does it reduce signal loss?
  A: It is a mechanical component that enables stable optical coupling through a vacuum boundary. Signal loss is minimized by rigid metal-sealed fixation of the fiber to the sapphire window flange, precise control of the fiber end-face position and alignment, and a screw-clamp mechanism that maintains stability over time.
• Q: Which flanges and configurations are supported? How to select for UHV use?
  A: Supported flanges: KF, CF, ISO. Channel counts: 1, 2, 4. Connector types: SMA, FC, etc. For UHV and high-temperature bake-out, select the CF (metal-sealed) version rated to 450°C. Provide flange type, channel count and termination details when ordering; customization is possible for special cavities.

Technical specifications

• Standard connector feedthrough heads: SMA, FC (others on request)
• Vacuum-side thread: standard 3/16" × 1/2" for direct flange installation
• Fiber fixation: metal-sealed feedthrough head mounted to sapphire vacuum-window flange for rigid mechanical fixation
• Channel options: 1, 2, 4
• Supported flanges: KF, CF, ISO
• UHV capability: CF (metal-sealed) version suitable for ultra-high vacuum and bake-out up to 450°C
• Mechanical: compact, sturdy construction with clamping-screw alignment fixation
• Typical uses: spectroscopy, laser coupling, vacuum diagnostics, optical metrology, vacuum sensors, R&D, industrial monitoring