Acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to laser heterodyne interferometer

A technology of laser heterodyne interferometry and laser emission system, which is applied to lasers, phonon exciters, optical devices, etc., can solve the problem of low measurement accuracy of laser heterodyne interferometers, avoid beam energy loss, and improve measurement accuracy , the effect of improving the transmission efficiency

Inactive Publication Date: 2010-12-15
HARBIN INST OF TECH
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Problems solved by technology

[0007] In order to solve the problem of low measurement accuracy of the laser heterodyne interferometer due to the polarization mixing error of the existing orthogonally polarized light source emission system, the present invention provides a 2μm polarized orthogonal laser emission system

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  • Acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to laser heterodyne interferometer
  • Acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to laser heterodyne interferometer
  • Acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to laser heterodyne interferometer

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specific Embodiment approach 1

[0020] Specific implementation mode one: according to the instructions attached figure 1 , 2 , 3, 4, 5 and 6 specifically describe this embodiment, a 2 μm polarization orthogonal laser emission system based on acousto-optic modulation applied to a laser heterodyne interferometer described in this embodiment, the emission system includes a 2 μm laser 1. The first fiber collimator 2-1, the second fiber collimator 2-2, the polarizer 3, the fiber beam splitter 4, the first acousto-optic frequency shifter 5, the second acousto-optic frequency shifter 6, Polarization controller 7, polarization beam splitting prism 8, first optical fiber 9-1, second optical fiber 9-2 and third optical fiber 9-3,

[0021] The 2 μm laser 1 outputs laser light with a wavelength of 2 μm to the signal receiving end of the first fiber collimator 2-1, and the first fiber collimator 2-1 outputs 2 μm collimated laser light to the signal receiving end of the polarizer 3 end, the polarizer 3 outputs P light t...

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is that: the transmission system described in this embodiment also includes a third fiber collimator 2-3 and a fourth fiber collimator 2-4, so The signal receiving end of the third optical fiber collimator 2-3 is connected to the signal output end of the third optical fiber 9-3, and the signal output end of the third optical fiber collimator 2-3 is connected to the first polarizing beam splitting prism 8. A signal receiving end 8-1 is connected; the signal receiving end of the fourth optical fiber collimator 2-4 is connected with the signal output end of the polarization controller 7, and the signal output end of the fourth optical fiber collimator 2-4 It is connected with the second signal receiving end 8-2 of the polarization beam splitting prism 8.

specific Embodiment approach 3

[0026] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the beam splitting ratio x:y=50:50 of the optical fiber beam splitter 4 described in this embodiment

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Abstract

The invention discloses an acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to a laser heterodyne interferometer, which relates to a polarized orthogonal laser source emitting system. The system solves the problem of low measurement precision of the laser heterodyne interferometer due to polarized mixing error of the conventional orthogonal polarized light source emitting system. The system comprises a 2mu m laser device, a plurality of fiber collimators, a polarization sheet, a fiber beam splitter, two acousto-optic frequency shifters, a polarization controller, a polarized beam splitter prism and a plurality of fibers, wherein the laser of the 2mu m laser device passes through the fiber collimators and the polarization sheet and then enters the fiber beam splitter, the input laser is split into two beams of P laser by the fiber beam splitter, one beam of P laser enters one acousto-optic frequency shifter through the fibers to perform frequency shift and then enters the polarized beam splitter prism, the other beam of P laser is subjected to frequency shift and then enters the polarization controller, the polarization controller converts the P laser into S laser and outputs the S laser to the polarized beam splitter prism, and the P laser and the S laser form an orthogonal polarized beam for emission at an emission port of the polarized beam splitter prism. The system is suitable for a light source system of the laser heterodyne interferometer.

Description

technical field [0001] The invention relates to a polarization orthogonal laser light source emission system, in particular to a 2 μm polarization orthogonal laser emission system applied to a laser heterodyne interferometer based on acousto-optic modulation. Background technique [0002] The traditional laser heterodyne interferometer system adopts free-space optical path structure. This kind of system has a huge structure. Due to the use of a large number of optical components, its cost is high, adjustment is difficult, and repeated calibration and adjustment are required. Secondly, although the traditional laser interferometer light source can also produce laser beams with orthogonal polarization, the wavelength of these beams is in the visible light band, which is not safe for human eyes, and its application field can no longer meet the needs of ultra-smooth optical element surfaces. measurement requirements. [0003] With the development of laser technology and optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/00G02B27/09G02B27/30G02F1/125G01B9/02
Inventor 王春晖高龙李彦超丛海芳曲杨
Owner HARBIN INST OF TECH
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