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Proceedings Paper

Automatic online laser resonator alignment based on machine vision: analysis
Author(s): Lizhi Dong; Wenjin Liu; Ping Yang; Shuai Wang; Xing He; Bing Xu
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Paper Abstract

In order to maintain sufficient performance of a laser, proper alignment of the resonator is very important. We present online laser resonator alignment based on machine vision. In this method, a camera detects the displacement of the laser beam spot on the rear mirror from a reference location, and the displacement of this spot is used to indicate the misalignment of the cavity mirrors. The resonator could be automatically aligned using the displacement as feedback. We give a detailed analysis of the relation between tilt of resonator mirrors and the beam spot location on the rear mirror by calculating the modes of the resonator. Both a stable symmetric confocal resonator and a positive branch confocal unstable resonator are investigated. Calculation results show that the displacement of the beam spot on the rear mirror continuously grows with tilt of the resonator mirrors, and the direction of the displacement can well reflect the direction of the misalignment, indicating that the displacement can effectively denote resonator misalignment.

Paper Details

Date Published: 22 June 2015
PDF: 6 pages
Proc. SPIE 9530, Automated Visual Inspection and Machine Vision, 95300L (22 June 2015); doi: 10.1117/12.2184585
Show Author Affiliations
Lizhi Dong, Institute of Optics and Electronics (China)
Wenjin Liu, Institute of Optics and Electronics (China)
Ping Yang, Institute of Optics and Electronics (China)
Shuai Wang, Institute of Optics and Electronics (China)
Univ. of Chinese Academy of Sciences (China)
Xing He, Institute of Optics and Electronics (China)
Univ. of Chinese Academy of Sciences (China)
Bing Xu, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 9530:
Automated Visual Inspection and Machine Vision
Jürgen Beyerer; Fernando Puente León, Editor(s)

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