Anisotropic optical feedback of single frequency intra-cavity He--Ne laser |
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Authors: | Zhou Lu-Fei Zhang Bin Zhang Shu-Lian Tan Yi-Dong and Liu Wei-Xin |
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Affiliation: | The State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China; Department of Optics Science and Technology, National University of Defense Technology, Hunan 410073, China |
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Abstract: | This paper presents the anisotropic optical feedback of a single
frequency intra-cavity He--Ne laser. A novel phenomenon was
discovered that the laser output an elliptical polarized frequency
instead of the initial linear polarized one. Two intensities with a
phase difference were detected, both of which were modulated in the
form of cosine wave and a fringe shift corresponds to a $\lambda /2$
movement of the feedback mirror. The phase difference can be
continuously modulated by the wave plate in the external cavity.
Frequency stabilization was used to stabilize the laser frequency so
as to enlarge the measuring range and improve the measurement
precision. This anisotropic optical feedback system offers a
potential displacement measurement technology with the function of
subdivision of $\lambda/2$ and in-time direction judgment.
The three-mirror Fabry--Perot cavity model is used to present the
experimental results. Given the lack of need of lasing adjustment,
this full intra-cavity laser can significantly improve the
simplicity and stability of the optical feedback system. |
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Keywords: | optical feedback single
frequency mode competition displacement measurement |
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