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Chin. Phys. B, 2018, Vol. 27(2): 024201    DOI: 10.1088/1674-1056/27/2/024201
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Sub-external cavity effect and elimination method in laser self-mixing interference wave plate measurement system

Haisha Niu(牛海莎)1, Yanxiong Niu(牛燕雄)1, Jianjun Song(宋建军)2
1. School of Instrument Science and Optoelectronic Engineering, Beihang University, Beijing 100191, China;
2. School of Mechanical Engineering, Nantong University, Nantong 226019, China
Abstract  Laser self-mixing interference (SMI) wave plate measurement method is a burgeoning technique for its simplicity and efficiency. But for the non-coated sample, the reflected light from the surface can seriously affect the measurement results. To analyze the reason theoretically, a self-consistent model for laser operation with a sub-external and an external cavity is established, and the sub-external cavity formed by the sample and a cavity mirror is proved to be the main error source. A synchronous tuning method is proposed to eliminate the sub-external cavity effect. Experiments are carried out on the synchronously tuning double external cavities self-mixing interference system, and the error of the system is in the range of -0.435°~0.387° compared with the ellipsometer. The research plays an important role in improving the performance and enlarging the application range of the laser self-mixing interference system.
Keywords:  self-mixing interference      non-coated wave plate measurement      self-consistent model  
Received:  06 September 2017      Revised:  10 October 2017      Accepted manuscript online: 
PACS:  42.25.Hz (Interference)  
  42.30.Lr (Modulation and optical transfer functions)  
  42.25.Lc (Birefringence)  
  06.30.Ka (Basic electromagnetic quantities)  
Corresponding Authors:  Yanxiong Niu     E-mail:  niuyx@buaa.edu.cn
About author:  42.25.Hz; 42.30.Lr; 42.25.Lc; 06.30.Ka

Cite this article: 

Haisha Niu(牛海莎), Yanxiong Niu(牛燕雄), Jianjun Song(宋建军) Sub-external cavity effect and elimination method in laser self-mixing interference wave plate measurement system 2018 Chin. Phys. B 27 024201

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