The feedback phenomenon of orthogonally polarized dual frequency laser has not been explained theoretically. This paper gives a model based on Lamb’s semi-classical gas-laser theory for the first time. The intensity reflectivity of the feedback mirror, the polarization characteristics of the dual frequency laser and external cavity length are considered besides the parameters studied before. The intensities of o-light and e-light are tuned by feedback mirror. The intensity alternation, leaning of curves and height difference of the two equal–intensity points etc. are discovered in the region of moderate optical feedback level. The experiments are done and the results are in good agreement with the theoretical model.
© 2005 Optical Society of America
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