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Method and device for measuring small optical transverse displacement based on laser high-order transverse mode

A high-order transverse mode and measurement device technology, applied in the direction of measurement devices, optical devices, instruments, etc., can solve the problems of high requirements for measurement conditions, complex equipment, and insufficient sensitivity of optical lateral small displacement measurement, so as to improve measurement sensitivity, The effect of simple device and compact structure

Inactive Publication Date: 2014-05-14
SHANXI UNIV
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Problems solved by technology

[0012] The present invention provides a method and device for precisely measuring small optical lateral displacements in order to solve the technical problems of insufficient sensitivity of optical lateral small displacements or complex equipment and high requirements for measurement conditions.

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  • Method and device for measuring small optical transverse displacement based on laser high-order transverse mode
  • Method and device for measuring small optical transverse displacement based on laser high-order transverse mode
  • Method and device for measuring small optical transverse displacement based on laser high-order transverse mode

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[0031] A method for measuring small optical lateral displacements based on high-order transverse modes of lasers, comprising the following steps: (a) using a Hermitian Gaussian laser in an n-order mode as signal light 2, and using a Hermitian Gaussian laser in an n+1-order mode The laser is used as the local light 5, and the n≧1; (b) make the signal light 2 generate a lateral translation amount d; (c) based on the principle of balanced zero-beat detection, combine the local light 5 with the signal light after translation, that is, the light to be measured 4 are divided into two beams of light with equal intensity, and each beam of local light 5 after equalization coincides with a beam of light 4 to be measured after equal division to form two new beams of laser light; (d) collect two new beams of laser light respectively For the intensity signal of the laser, the intensity signal is converted into the corresponding electrical signal and then subtracted; the electrical signal ob...

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Abstract

The invention relates to measuring methods and devices in the field of laser precise measurement and quantum measurement, in particular to a method and device for measuring small optical transverse displacement based on a laser high-order transverse mode. The method for measuring the small optical transverse displacement based on the laser high-order transverse mode comprises the following steps that (a) an Hermite-Gaussian laser with an n-order mode and an Hermite-Gaussian laser with an n+1-order mode are used as signal light and local light respectively, wherein n is greater than or equal to 1; (b) the signal light is made to generate a horizontal movement quantity d; (c) the local light and the signal light which is moved horizontally, namely the light to be measured, are respectively divided into two light beams with the same intensity; (d) intensity signals of two new laser beams are collected respectively, electric signals obtained after subtraction are converted into corresponding power signals, the value of d can be obtained, and then information of an object to be measured can be deduced. By means of the method and device for measuring the small optical transverse displacement based on the laser high-order transverse mode, measuring sensitivity is high and can reach or exceed the sensitivity of measurement conducted through a one-order squeezed-state light field; besides, the device is simple and easy to control.

Description

technical field [0001] The invention relates to a measurement method and device in the field of laser precision measurement and quantum measurement, in particular to the precision measurement of small laser lateral displacements, more specifically to a measurement method and device for small optical lateral displacements based on laser high-order transverse modes. Background technique [0002] Optical small displacement measurement is a small displacement measurement technology based on sensitive interference of light. Many physical quantities can be converted into light displacement for indirect measurement. Because the measurement sensitivity of optical displacement is very high, it has been more and more popular in recent years. focus on. The order of magnitude of the optical small displacement is generally 1 Angstrom, that is, 10 -10 rice. [0003] Related research work before this includes: [0004] 1. In 2000, C. Fabre et al. published an article entitled "The Limit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
Inventor 郜江瑞孙恒信刘奎刘尊龙郭鹏亮张俊香
Owner SHANXI UNIV
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