Orthogonally polarized dual-wavelength Tm,Ho:(LuLiF4/YLiF4) laser with high power-stability and tunable power-ratio

An orthogonally polarized dual-wavelength laser with high power-stability and wide power-ratio tunability, based on the combined Tm,Ho:LuLiF4 and Tm,Ho:YLiF4 dual crystals, has been first reported. Output power equalization of two orthogonal polarizations was realized at various pump powers. At the maximum total output power of 578 mW, the root mean square instabilities were 0.8 % and 0.6 % for the S-polarized 2067.3 nm and P-polarized 2065.5 nm lasers, respectively. The ratio of output powers between S-polarized laser and P-polarized laser could be tuned from 0.009 to 78.54 by controlling the axial position of pump laser waist. Moreover, the orthogonal polarization dual-wavelength single longitudinal mode laser was also successfully realized. Under 1.54 W absorbed pump power, the maximum output powers of 69.3 mW and 74.6 mW were obtained for the S-polarized 2053.5 nm laser and P-polarized 2068.0 nm laser, respectively.