|Table of Contents|

Research on Displacement Measurement of CurrentModulated Laser Self-mixing Grating Interference(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2020年03期
Page:
34-39
Research Field:
·物理学·
Publishing date:

Info

Title:
Research on Displacement Measurement of CurrentModulated Laser Self-mixing Grating Interference
Author(s):
Cai Wenkui; Shen Zhongjie; Zhao Huimin; Guo Dongmei
School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China
Keywords:
laser self-mixing interferometer; grating interferometer; displacement measurement; sinusoidal current modulation; Littrow configuration
PACS:
TN249
DOI:
10.3969/j.issn.1001-4616.2020.03.007
Abstract:
A self-mixing grating interferometry with current modulation is proposed to measure one-dimensional displacement in this paper. Through the design of the Littrow configuration,the grating diffracted light returns to the laser in the original direction along the incident direction,and laser self-mixing interference effect occurs when the reflected light mixes with the light inside the cavity. The interference phase changes with the grating’s movement in the grating vector direction because of grating Doppler effect. To improve measurement accuracy,through sinusoidally modulating driving current of a semiconductor laser,the output wavelength is also changed sinusoidally. The phase of the interference signal is also modulated,then Fourier analysis method is introduced to demodulate the phase and finally achieve the restoration of diffraction displacement. The mechanism of laser self-mixing interference and the design of Littrow configuration ensure the compactness and autocollimation of the entire optical system. The experimental results show that the displacement noise level of the measurement system is within 50 nm.

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Last Update: 2020-09-15