Hermite-Gauss mode beam splitter based on single polarization modulation device

A single-polarization, beam splitter technology, applied in the optical field, can solve the problems of immaturity, impracticality, complex structure of the beam splitter, etc., and achieve high efficiency.
CN112505935AInactive Publication Date: 2021-03-16XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2021-03-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an Hermite-Gauss mode beam splitter based on a single polarization modulation device. The splitter comprises a single polarization phase converter and a common-path polarization interference system, wherein the single polarization phase converter consists of two single polarization cylindrical lenses and only performs phase modulation on one of orthogonal polarization states. The planes of the two single-polarization cylindrical lenses are opposite and coaxially arranged, the curved surfaces of the lenses can be placed in a horizontal mode or a vertical mode, and the distance between the lenses meets the formula that d = 2sin (theta / 2) f. According to the common-path polarization interference system, two orthogonal polarization substrates are used for replacing twopaths of a traditional interferometer, and polarization projection is used for replacing path beam combination at an outlet. By changing the phase value and the placement mode of the single polarization phase converter, a phase difference directly related to horizontal or vertical parameters of the Hermite-Gauss mode is generated between two polarization components, different input modes finally appear from different channels by means of a common-path polarization interference system, and the purpose of distinguishing the HG modes is achieved.
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Description

technical field

[0001] The invention belongs to the field of optical technology, in particular to a Hermitian-Gaussian mode beam splitter based on a single polarization modulation device. Background technique

[0002] The Hermitian-Gaussian (HG) mode and the Laguerre-Gaussian (LG) mode are two kinds of laser transverse modes that are widely used in the field of optical technology. The ability to effectively discriminate between different modes. To achieve this goal, researchers have begun to build a variety of such devices, known as mode beam splitters. At present, the technology of LG mode beam splitter is relatively mature, but the research results of HG mode beam splitter are still very few.

[0003] There are mainly two kinds of existing work on the distinction of HG modes. The first one is based on the Mach-Zehnder interferometer and other path interferometer schemes. The practicability and stability of the interferometer in this method greatly limits all The number ...

Claims

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