中国物理B ›› 2018, Vol. 27 ›› Issue (2): 24201-024201.doi: 10.1088/1674-1056/27/2/024201
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Sub-external cavity effect and elimination method in laser self-mixing interference wave plate measurement system
Haisha Niu(牛海莎), Yanxiong Niu(牛燕雄), Jianjun Song(宋建军)
- 1. School of Instrument Science and Optoelectronic Engineering, Beihang University, Beijing 100191, China;
2. School of Mechanical Engineering, Nantong University, Nantong 226019, China
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
摘要： 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.
中图分类号: (Interference)
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