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Beam splitting method and device for obtaining M*N beam laser array

A laser array and laser beam technology, applied in optics, optical components, instruments, etc., can solve problems such as complex optical path structure, large energy loss, and difficult adjustment of beam splitting ratio, and achieve the effect of simplifying the adjustment process and low energy loss

Pending Publication Date: 2022-01-28
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a beam splitting method and device for obtaining an M×N beam laser array. The invention solves the problems of large energy loss before and after beam splitting, difficulty in adjusting the beam splitting ratio, and optical path structure existing in the existing beam splitting method and device. Issues such as complexity and low damage threshold of optical components are described in detail below:

Method used

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  • Beam splitting method and device for obtaining M*N beam laser array
  • Beam splitting method and device for obtaining M*N beam laser array
  • Beam splitting method and device for obtaining M*N beam laser array

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Effect test

Embodiment 1

[0125] The beam splitting method used to obtain the M×N beam laser array is as follows figure 1 As shown, where M represents the number of laser array rows after longitudinal beam splitting, and N represents the number of laser beams in each row after horizontal beam splitting. Since the number of laser beams in each row can be different, record the number of beams in the mth row as N m , where m=1,2,...,M. The longitudinal beam splitting unit 1 is composed of beam splitting mirrors (1,0) to (M,0) arranged in the vertical direction, and the beam splitting mirrors form an included angle of 45° with the horizontal plane along the beam propagation direction. The incident laser beam enters the beam-splitting mirror (1,0) of the longitudinal beam-splitting unit 1 along the horizontal direction. Mirrors (2,0) to (M,0) are reflected to form the second to Mth laser beams, and each laser beam is still transmitted along the horizontal direction after longitudinal beam splitting. The t...

Embodiment 2

[0131] This embodiment is a further extension of Embodiment 1, such as figure 2 shown. Embodiment 2 is based on Embodiment 1, and adjusts the relative positions of the longitudinal beam splitting unit and the lateral beam splitting unit so that the propagation direction of the laser array after beam splitting is the same as that of the incident laser beam, thereby adapting to different application scenarios. figure 2 The longitudinal beamsplitter unit 3 in the figure 1 The longitudinal beam splitting unit 1 has the same structure, and the incident laser light to be split is divided into M beams in the vertical direction, output along the same direction, and enter the transverse beam splitting unit 4. The transverse beam splitting unit 4 has the same structure as the transverse beam splitting unit 2 . The longitudinal beam splitting unit 3 outputs the m-th row of laser beams, which are incident on the beam splitting mirror (m, 1) of the transverse beam splitting unit 4, and...

Embodiment 3

[0136] This embodiment is a further limitation of the specific embodiments 1 and 2. The beam splitting mirror is a parallel plane mirror. When the transmittance ratio is not zero, it is a 45° partial reflector; when the transmittance ratio is zero, it is a 45° total reflector. The incident surface of the 45° beam splitting mirror is coated with a partial reflection or total reflection film, and the transmittance ratio of the film layer follows the calculation result of the corresponding formula; the non-incident surface is coated with an anti-reflection film layer to avoid Fresnel reflection from affecting the actual beam splitting ratio The effect of beam interference on the cross-field distribution of the beam after beam splitting.

[0137] The absorption rate of the optical component material to the laser energy is lower than 1%, the diameter of the beam splitting mirror is greater than 1.5 times the diameter of the incident light, and the damage threshold should not be low...

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Abstract

The invention discloses a beam splitting method and device for obtaining an M * N laser array, and the method comprises the steps: dividing an incident laser beam into M laser beams which are transmitted in the horizontal direction in the vertical direction, dividing each laser beam which is transmitted in the horizontal direction into N laser beams, and forming the laser array in which any two M * N laser beams are parallel to each other and have the same aperture, wherein the polarization state of the laser after beam splitting is the same as that of the laser before beam splitting; determining the energy of each laser beam in the laser array after beam splitting by designing the ratio of the transmissivity to the reflectivity of the incident surface film layer of the 45-degree beam splitting reflector. The device comprises a longitudinal beam splitting unit mirror bracket and a transverse beam splitting unit mirror bracket, each mirror bracket comprises a light beam incidence hole, a light beam transmission channel, a light beam output hole, element mounting surfaces and a base, and the optical element mounting surfaces are parallel in pairs; and the split laser is incident through the light beam incidence hole, propagates along the light beam transmission channel, is split by the beam splitting reflecting mirror and is output from the light beam output hole, so that a laser array is formed.

Description

technical field [0001] The invention relates to the field of high-power laser beam combination, in particular to a beam splitting method and device for obtaining M×N beam laser arrays. Background technique [0002] Repetitive frequency high power pulsed laser has important applications in scientific development, industrial production and national defense construction. The use of laser beam grouping technology to obtain high-power laser output can avoid the accumulation of waste heat inside the large-diameter laser crystal, thereby solving the problem of beam quality degradation caused by the thermal effect of the laser system, and avoiding the risk of damage to the laser system. The laser beam combination technology based on Brillouin amplification is to pump many beams of small-caliber low-power pump light energy by one Stokes light to obtain a single beam of high-energy laser output. In order to achieve the phase matching between the many beams of pump light and the Stoke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/14
CPCG02B27/145
Inventor 吕志伟崔璨王雨雷白振旭
Owner HEBEI UNIV OF TECH
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