A collimator and in-line polarizer including the collimator

Abstract

The invention belongs to the technical field of optics, and provides a collimator. The collimator comprises a polarization-maintaining optical fiber and a multimode fiber or a core-free optical fiber welded to one end of the polarization-maintaining optical fiber, wherein the tail end of the multimode fiber or the core-free optical fiber is fused into a spherical micro lens; the center axis of the spherical micro lens is collinear with the center axis of the multimode fiber or the core-free optical fiber; the length from a vertex of the spherical micro lens to the melting point of the multimode fiber or the core-free optical fiber is equal to the focal length of the spherical micro lens. Compared with the conventional composition of an optical fiber head and a lens, the collimator disclosed by the invention is not required to be clamped or ground, and is not influenced by a clamping size, and even the size is smaller; in addition, the polarization-maintaining optical fiber is welded to the thicker multimode fiber or the core-free optical fiber, the output light beam can be expanded, the light spot on the spherical micro lens is greater than the diameter of the polarization-maintaining optical fiber, so that the collimator can bear the power higher than the power at the output end of the polarization-maintaining optical fiber, namely the power is higher than the bearing power of the conventional collimator, and the high-power resistance of an on-line polarizer can be improved.

Description

technical field [0001] The invention belongs to the technical field of optical devices, in particular to a collimator and an online polarizer including the collimator. Background technique [0002] With the technical development and maturity of supporting optical components, the technology of fiber optic sensing has also been greatly developed. Therefore, fiber optic sensors have been widely used in various industries in recent years. Important fiber optic sensors such as fiber optic gyroscopes and fiber optic hydrophones have begun to be used in military systems such as aviation, spaceflight and submarines. These military systems all have strict volume requirements for the fabricated devices, and the smaller the requirements, the better. As one of the main basic components of fiber optic gyroscopes and fiber optic hydrophones, the online polarizer also requires a sufficiently short size. [0003] The structure of a conventional collimator is as follows figure 1 As shown,...

AI Technical Summary

Problems solved by technology

The end face of the optical fiber head is also ground and polished by cold processing, also because of the grinding and clamping, the length cannot be made too short, which is the factor that restricts the overall length of the product

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