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Influence of Optical Feedback from Birefringence External Cavity on Intensity Tuning and Polarization of Laser |
| FEI Li-Gang;ZHANG Shu-Lian;WAN Xin-Jun |
| The State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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FEI Li-Gang, ZHANG Shu-Lian, WAN Xin-Jun 2004 Chin. Phys. Lett. 21 1944-1947 |
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Abstract The characteristics of intensity tuning and polarization of He-Ne laser with optical feedback are studied. When the internal cavity length of the laser with birefringence optical feedback is tuned, not only does output intensity vary with laser frequency, but also the polarization periodically hops between two orthogonal directions. If the phase difference of birefringence is π/2, two polarization states alternately oscillate and have equal bandwidths within the longitudinal mode spacing. The times of polarization flipping in the longitudinal mode bandwidth is proportional to the ratio of external cavity length to internal cavity length. The experimental results are explained, and the potential uses are also discussed.
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| Keywords:
42.55.Lt
42.60.Jf
42.25.Lc
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Published: 01 October 2004
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| PACS: |
42.55.Lt
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(Gas lasers including excimer and metal-vapor lasers)
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42.60.Jf
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(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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42.25.Lc
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(Birefringence)
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