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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.

Inactive Publication Date: 2021-03-16
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 of HG modes that can be distinguished and the quality of the experiment
Another solution is still immature. The basic principle is to convert HG light into LG light, and then achieve the purpose of beam splitting by combining the LG mode distinction method. Therefore, the structure of this HG mode beam splitter is complicated and complex, and Not practical
So far, there is no beam splitter that can be directly and perfectly suitable for HG mode

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0037] Such as image 3 As shown, a spatial light modulator is used to simulate the function of a single polarization phaser.

[0038] First, keep the incident HG mode as horizontally polarized, and the HWP with an overfast axis angle of 22.5° becomes linearly polarized light in the direction of 45°, which is irradiated vertically on the SLM, and the loaded grating is as follows Figure 4 and Figure 5As shown; using the back and forth reflection of the beam splitter, mirror and reflective spatial light modulator, the incident light passes through the SLM twice and shines on two different areas on the left and right respectively. Keeping the optical path collimated is equivalent to passing through two planes Opposite, coaxially placed lenticular lenses. In addition, the commonly used reflective phase-type spatial light modulator has the characteristic of only modulating a single polarization (for example, the Holoeye Pluto-VIS-016 only modulates the horizontal polarization),...

Embodiment 2

[0048] Such as Figure 6 As shown, a single-polarization cylindrical lens CL is used to complete the construction of the phase converter. Due to the polarization response characteristics of the single-polarization cylindrical lens, this single-polarization cylindrical phase converter modulates the phase of the left-handed circular polarization part, while the phase of the right-handed circular polarization part is modulated. The circular polarization part has no effect, thus realizing the function of phase manipulation on the single polarization substrate.

[0049] First, keep the incident HG mode as horizontally polarized, replace the two propagation paths of the traditional path interferometer with left-handed circular polarization and right-handed circular polarization, and then use the phase conversion formed by two single-polarization cylindrical lenses with opposite planes and placed in parallel The device introduces a discrete phase difference (m+1 / 2)θ or (n+1 / 2)θ relat...

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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.

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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Application Information

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IPC IPC(8): G02B27/28
CPCG02B27/283G02B27/286
Inventor 张沛刘青贾俊亮
Owner XI AN JIAOTONG UNIV
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