Vacuum bare fiber introducing device

Abstract

The invention relates to a bare optical fiber vacuum introduction device, comprising: a ferrule is fixed on a flange, and a first through hole is arranged at the place where the ferrule is fixed; the end of the ferrule far away from the flange is provided with a screw thread, and the end of the ferrule is provided with a thread The second through hole, the second through hole of the tube is connected with the first through hole of the flange; the sealing ferrule is elastic, with a vertical through hole, and the lower part shrinks gradually from top to bottom, and is a rotating body; the ferrule The tube nut fits with the thread of the tube, and the inside is a through hole; the upper part of the second through hole of the tube gradually opens from bottom to top, and cooperates with the sealing ferrule, the first through hole of the flange, the tube The centerlines of the second through hole, the vertical through hole of the seal ferrule, and the through hole of the tube nut coincide when assembled. The invention does not need optical fiber connectors and vacuum sealants, has low cost, simple structure, convenient installation and disassembly, is suitable for different types of bare optical fibers, ensures lossless transmission of optical fiber signals and maintains ultra-high vacuum inside the vacuum chamber.

Description

technical field [0001] The invention relates to the technical field of optical fiber vacuum introduction, in particular to a bare optical fiber vacuum introduction device. Background technique [0002] In modern physics experiments, ultra-high vacuum experimental equipment is becoming more and more common. In the process of laser cooling atomic experiments, it is sometimes necessary to introduce laser light into an ultra-high vacuum chamber through an optical fiber, so a fiber optic vacuum introduction device is needed. [0003] Vacuum flanges mainly have three specifications (CF, KF, ISO) according to the sealing form. 1. CF flange is a flange connection used in ultra-high vacuum. It is a metal static seal that can withstand high temperature baking. The applicable vacuum degree is up to 10 - 12 mbar. 2. KF flange is a kind of quick assembly and disassembly flange connection used in vacuum system. It is usually sealed by rubber ring, and the applicable vacuum degree is u...

AI Technical Summary

Problems solved by technology

The structure of this device is complicated, and loss will occur at the fiber connection. At the same time, it is difficult to connect the fiber to the connector on the vacuum side of the flange in the narrow vacuum chamber, and the fiber sealed in the stainless steel flange shell cannot be replaced. Units can only connect to specific types of fiber and are expensive

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