Oscillation conditions of cw simultaneous dual-wavelength Nd:YAG laser for transitions ⁴F_3/2-⁴I_9/2 and ⁴F_3/2-⁴I_11/2

The operating condition of a cw simultaneous dual-wavelength Nd:YAG laser for both ^4F_3/2-^4I_9/2 (quasi-three-level system) and ^4F_3/2-^4I_11/2(four-level system) transitions is studied. According to this condition, the cw simultaneous dual-wavelength at 1.06μm and 946 nm in Nd:YAG crystal has been realized experimentally through an adaptive coating design of the cavity mirrors. A total power output of 2.5W of the dual-wavelength at 946nm and 1.06μm has been achieved with an optical conversion efficiency 14.3%. The experimental results are in good agreement with the theoretical analysis.