Strong optical feedback in birefringent dual frequency laser
Mao Wei (毛威), Zhang Shu-Lian (张书练)
The State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments, Tsinghua University, Beijing 100084, China
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.
Received: 31 May 2005
Revised: 29 September 2005
Accepted manuscript online:
PACS:
42.55.Lt
(Gas lasers including excimer and metal-vapor lasers)
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