| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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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.
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Received: 06 September 2017
Revised: 10 October 2017
Accepted manuscript online:
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PACS:
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42.25.Hz
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(Interference)
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42.30.Lr
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(Modulation and optical transfer functions)
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42.25.Lc
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(Birefringence)
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06.30.Ka
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(Basic electromagnetic quantities)
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Corresponding Authors:
Yanxiong Niu
E-mail: niuyx@buaa.edu.cn
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| 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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