1School of Science, Changchun University of Science and Technology, Changchun 130022, China
2State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
This Letter proposes a method to balance the gain and loss of the orthogonally polarized emissions of dual wavelengths in a solid laser cavity. By adjusting the tilt angle of the uncoated glass plate inserted into the cavity, the gain and loss of the orthogonally polarized emission lines with small intervals can be balanced to equalize the oscillation thresholds of the orthogonally polarized dual wavelengths. We select the birefringent crystal Nd:LiYF (Nd:YLF) as the gain media, and theoretically analyze the simultaneous oscillation conditions of dual wavelengths with - and -polarized emissions from a four-level transition ( and ) in . A simple linear cavity structure is adopted in the experiment, and stable CW orthogonally polarized dual-wavelength laser outputs of 1047, and 1053, 1321, and 1313 nm are obtained.