Abstract

In this paper, a vibration-displacement immunization model is proposed to measure the free spectral range of a resonant cavity by using a laser self-mixing velocimeter. The validity of this method is demonstrated by the experimental results, which can effectively get rid of low measurement accuracy related to the self-mixing vibration system due to the vibratory displacement. According to the periodic waveform separation characteristic of the self-mixing velocity signal, the free spectral range of a multilongitudinal mode diode laser is calculated to be 88.24 GHz. Moreover, the influences of different target velocities and signal sampling frequencies on the free spectral range have been analyzed in detail from the theoretical analysis. In the case of high signal sampling rate and low velocity, from which the undistorted velocity signal waveform at the integral order external cavity mode keeps stable, it is possible to obtain relatively accurate measured results.

© 2019 Optical Society of America

Simultaneous measurement of velocity and length of moving surfaces by a speckle velocimeter with two self-mixing laser diodes

Şahin Kaya Özdemir, Tatsuya Takasu, Shigenobu Shinohara, Hirofumi Yoshida, and Masao Sumi
Appl. Opt. 38(10) 1968-1974 (1999)

Correlation-based speckle velocimeter with self-mixing interference in a semiconductor laser diode

Şahin Kaya Özdemir, Satoshi Ito, Shigenobu Shinohara, Hirofumi Yoshida, and Masao Sumi
Appl. Opt. 38(33) 6859-6865 (1999)

Effect of external cavity length on self-mixing signals in a multilongitudinal-mode Fabry–Perot laser diode

Liang Lv, Huaqiao Gui, Jianping Xie, Tianpeng Zhao, Xiyao Chen, Anting Wang, Feng Li, DeYong He, Jun Xu, and Hai Ming
Appl. Opt. 44(4) 568-571 (2005)

Secondary envelope extraction based on multiple Hilbert transforms for laser self-mixing micro-vibration measurement

Xiangyu Cui, Chunsheng Li, Yuhan Geng, Weijie Ge, Lingling Kan, and Zihua Zhang
Appl. Opt. 58(34) 9392-9397 (2019)

Equivalent wavelength self-mixing interferometry for displacement measurement

Zhen Huang, Chengwei Li, Songquan Li, and Dongyu Li
Appl. Opt. 55(25) 7120-7125 (2016)