Strong optical feedback in birefringent dual frequency laser |
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Authors: | Mao Wei and Zhang Shu-Lian |
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Institution: | The State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments, Tsinghua University, Beijing 100084, China |
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Abstract: | Strong optical feedback in a birefringent dual frequency He--Ne laser with a
high reflectivity feedback mirror has been investigated for the first time.
The output characteristics of two orthogonally polarized modes are
demonstrated in two different optical feedback cases: one is for both modes
being fed back and the other is for only one of the modes being fed back.
Strong mode competition can be observed between the two modes with strong
optical feedback. And when one mode's intensity is near its maximum, the
other mode is nearly extinguished. When both modes are fed back into the
laser cavity, the mode competition is stronger than when only one mode is
fed back. The difference in initial intensity between the two orthogonally
polarized modes plays an important role in the mode competition, which has
been experimentally and theoretically demonstrated. |
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Keywords: | strong optical feedback intensity modulation dual frequency laser mode competition |
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