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Adaptive photoheterodyne method for detecting light refraction

A detection method and optical heterodyne technology, applied in the optical field, can solve the problems of not being in the best state of detection sensitivity, low signal-to-noise ratio, and difficult to adjust the optical path.

Inactive Publication Date: 2004-09-08
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention mainly solves the problems that the existing photorefractive adaptive optical heterodyne detection technology has a low signal-to-noise ratio, the detection sensitivity cannot be in the best state, and the optical path adjustment is difficult

Method used

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  • Adaptive photoheterodyne method for detecting light refraction
  • Adaptive photoheterodyne method for detecting light refraction
  • Adaptive photoheterodyne method for detecting light refraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The crystal PR size is 6×6×7mm 3, the optical axis is along the long axis direction. Adjust the polarization direction of the laser output beam, so that the polarization directions of the pump beams 2 and 8 symmetrically incident on the two surfaces of the crystal are e-light incident on the crystal. When the incident angle θ of the two pump beams 2 and 8 to ensure the coexistence of self-pumping and mutual pumping phase conjugation is adjusted from 30° to 70°, the value range of the incident position x of the two pumping beams 2 and 8 is 2.25mm ~ 4.75mm. Wherein, the optimum incident angle and the optimum incident position are respectively θ=48° and x=4.0mm.

Embodiment 2

[0025] The crystal PR size is 5×5×6mm 3 , the optical axis is along the long axis direction. Adjust the polarization direction of the laser output beam, so that the polarization directions of the pump beams 2 and 8 symmetrically incident on the two surfaces of the crystal are e-light incident on the crystal. The value range of the incident position x of the two pump beams 2 and 8 when the adjustment range of the incident angle θ of the two pump beams 2 and 8 that ensure the coexistence of self-pumping and inter-pumping phase conjugation is 40° to 60° 2.0mm to 4.25mm. Wherein, the optimum incident angle and the optimum incident position are respectively θ=54° and x=3.0mm.

Embodiment 3

[0027] The crystal PR size is 5.5×5.5×6mm 3 , the optical axis is along the long axis direction. Adjust the polarization direction of the laser output beam, so that the polarization directions of the pump beams 2 and 8 symmetrically incident on the two surfaces of the crystal are e-light incident on the crystal. When the phase conjugate coexistence of self-pumping and inter-pumping is guaranteed, when the adjustment range of the incident angle θ of the two pumping beams 2 and 8 is 35° to 65°, the value range of the incident position x of the two pumping beams 2 and 8 is 2.25 mm to 4.5 mm, wherein the optimum incident angle and optimum incident position are respectively θ=50°x=3.5mm.

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Abstract

A light-reflection adaptive photoheterodyne probing method features only use of a light-reflective crystal PR. The signal beam and laser beam as pump beams are simulteneously emitted into the PR. Regulating their incident positions and incident angles can make PR work in phase-conjugated self-pump and mutual-pump coexistance state to generate the reflelected self-bump and mutual-pump beams, which has consistent optical pathes and are collimated and front matched on the photosensitive surface of photodetector. Its advantages are high S / N ratio and sensitivity, simple structure and easy regulation.

Description

technical field [0001] The present invention relates to the field of optics, specifically a new type of photorefractive phase conjugation based on the principle of nonlinear optical photorefractive phase conjugation, utilizing the coexistence characteristics of self-pumping and mutual pumping phase conjugation in photorefractive crystals. A photorefractive adaptive photoheterodyne detection method. This method is mainly used in optical heterodyne detection in the fields of laser communication, radar, heterodyne spectroscopy, and laser gyroscope. Background technique [0002] As we all know, optical heterodyne detection technology has higher detection sensitivity than direct detection technology, so it has a wide range of applications in weak signal detection. However, according to the principle of optical heterodyne technology, in order to obtain effective optical heterodyne on the photosensitive surface of the detector, the signal light and the reference light must have wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00G01C19/00G01C19/62G01C19/72G01V8/10G02B27/28G02F1/335
Inventor 石顺祥许海平孙艳玲陈利菊李家立刘继芳
Owner XIDIAN UNIV