A birefringent cavity He－Ne laser and optical feedback
Liu Gang (刘刚), Zhang Shu-Lian (张书练), Li Yan (李岩), Zhu Jun (朱钧)
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
Abstract Strong modes competition makes only one of o-light and e-light oscillate in a birefringent dual-frequency laser when the angle between the crystalline axis and the laser beam is nearly zero. When the oscillated mode is in a different part of the gain curve, the detected intensity curves of o-light and e-light are quite different in the existence of optical feedback. The curves are divided into five cases. Three cases of the experimental results can be used for direction discrimination. The polarization characteristics of the birefringent cavity He－Ne laser are also discussed without optical feedback.
Received: 17 October 2003
Revised: 13 February 2004
Accepted manuscript online:
PACS:
42.55.Lt
(Gas lasers including excimer and metal-vapor lasers)
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 85103, 68978018, 59275237, 69286001, 69778010, 59775088, 50127501, 60178010).
Cite this article:
Liu Gang (刘刚), Zhang Shu-Lian (张书练), Li Yan (李岩), Zhu Jun (朱钧) A birefringent cavity He－Ne laser and optical feedback 2004 Chinese Physics 13 855
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