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	Using a cat's eye cavity to improve displacement self-sensing laser
	Wenhua Du ; Yan Li ; Shulian Zhang ; Suo, R. ; Xinjun Wan
	2010-05-10 ; 2010-05-10
关键词	Practical Experimental/ displacement measurement gas lasers laser cavity resonators laser mirrors measurement by laser beam/ cat eye cavity displacement self-sensing laser laser device half-intracavity He-Ne laser birefringence element orthogonally polarized components cavity mirrors optical axis cavity length laser beam polarization retroreflector flat cavity mirror anti-misalignment cavity-cat eye cavity misalignment loss flat-concave cavity optical stability cavity stability mode competition displacement measurement HeNe/ A4262E Metrological applications of lasers A4255F Inert gas lasers A4260D Laser resonators and cavities A0630C Spatial variables measurement B4360E Metrological applications of lasers B4320C Gas lasers B4320L Laser resonators and cavities B7320C Spatial variables measurement/ HeNe/bin He/bin Ne/bin
中文摘要	A displacement self-sensing laser with a resolution of /i lambda //8 was invented by us a few years ago. This simple laser device mainly consists of a half-intracavity He-Ne laser with a birefringence element in the cavity, outputting a beam with two orthogonally polarized components. One of its cavity mirrors can move along the optical axis of the laser to change the cavity length. When this mirror is pushed (or pulled) by an item to be measured, the polarization of the laser beam varies once every /i lambda //8 variation of the cavity length. Though the displacement self-sensing laser has many outstanding functions, its measuring range was badly limited by inevitable misalignment resulted from sway of the cavity mirror in motion. The limited range prevents the sensor from going into actual application. This paper gives a solution to the problem, using a cat's eye retroreflector to replace the flat cavity mirror of the displacement self-sensing laser to construct an anti-misalignment cavity-cat's eye cavity (CEC). The misalignment loss in the CEC is theoretically analyzed and compared with that in a flat-concave cavity, and then the experiment to test the optical stability of CEC is carried out. Furthermore, the performance of the displacement self-sensing laser based on the CEC is also investigated. Results indicate that the misalignment tolerance of the CEC is much higher than that of the flat-concave cavity, i.e. the cavity stability is greatly improved. The measuring range of the displacement self-sensing laser can be up to 12mm with a resolution of 79.097nm and linearity better than 0.005%. [All rights reserved Elsevier].
语种	英语 ; 英语
出版者	Elsevier ; Switzerland
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/24662]
专题	清华大学
推荐引用方式 GB/T 7714	Wenhua Du,Yan Li,Shulian Zhang,et al. Using a cat's eye cavity to improve displacement self-sensing laser[J],2010, 2010.
APA	Wenhua Du,Yan Li,Shulian Zhang,Suo, R.,&Xinjun Wan.(2010).Using a cat's eye cavity to improve displacement self-sensing laser..
MLA	Wenhua Du,et al."Using a cat's eye cavity to improve displacement self-sensing laser".(2010).

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