Output response in orthogonal directions of a He–Ne laser caused by birefringent-external-cavity feedback |
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Authors: | P Zhang S-L Zhang Y-D Tan Z-Q Zhao and Z-L Zeng |
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Institution: | (1) State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing, 100084, China; |
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Abstract: | The output responses of phase, amplitude, and polarization of light intensity of a He–Ne laser with the birefringent external
cavity are presented. All phenomena are observed in two orthogonal directions related to the birefringent element’s orientation,
and are studied under weak optical feedback. Experiments are carried out in five available detecting positions. It is found
that laser intensities are modulated in the two orthogonal directions simultaneously, with a phase difference dominated by
the phase retardation of the birefringence element. The modulation amplitudes are different in the two directions. A special
polarization phenomenon is also observed and discussed. This research may provide a potential novel measuring principle for
transparent birefringent materials. |
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Keywords: | |
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