The optical feedthrough components are used to achieve stable and repeatable optical coupling between the vacuum chamber and the air side. They adopt standard optical connector feedthrough heads (such as SMA, FC), and the vacuum side interface is a standard 3/16″ × 1/2″ thread, which can be directly installed on the chamber flange. Each optical fiber is fixed to the flange assembly of the sapphire vacuum window through its metal-sealed feedthrough head in a rigid mechanical manner, ensuring that the fiber end face is at a fixed distance from the window and is aligned stably, minimizing signal loss to the greatest extent. Optical Fiber Vacuum Feedthrough is a product that for high-precision and low-loss optical transmission solution specifically designed for uhv environments.