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• Two stimulated polariton scattering effects are combined. • A tunable dual-wavelength laser with two Stokes cavities is realised. • The independent oscillation of two Stokes waves enables precise control of output wavelengths. We demonstrate a tunable dual-wavelength laser with two Stokes cavities by combining two stimulated polariton scattering (SPS) effects. The 1064 nm laser is initially generated through diode-side-pumping a Nd:YAG laser crystal. Subsequently, the first Stokes wave is obtained using a MgO:LiNbO 3 crystal, and its wavelength can be continuously tunable. Once the first Stokes wave within the cavity reaches a sufficient strength, it can further interact with MgO:LiNbO 3 to produce cascaded SPS. The second Stokes wave is also continuously tunable by adjusting the angle between two Stokes cavities. This dual-wavelength laser offers flexible tunability as two Stokes waves oscillate in separate cavities. The optimal wavelengths of this dual-wavelength laser were 1073.7 nm and 1083.1 nm, with maximum output power of 560 mW and 610 mW respectively at a pump power of 52 W. The cascaded SPS offers a promising approach to extend the laser spectrum through the utilization of diverse laser crystals and nonlinear crystals. [ABSTRACT FROM AUTHOR]

The present work successfully demonstrated a passively Q-switched solid-state 1 µm Nd:GSAG laser using a few layer molybdenum disulfide (MoS 2) saturable absorber. Controllable dual wavelengths of 1059.94 nm and 1062.3 nm were achieved in the experiment. We obtained the shortest pulse width of 217 ns and the highest pulse repetition frequency of 51.2 kHz. The pulse energy and peak power are 9.5 μJ and 43.7 W, respectively. To our knowledge, this is the first time that dual wavelengths with a controllable intensity ratio have been obtained in a Q-switched solid-state laser based on a MoS 2 saturable absorber at 1 μm. The results demonstrate that MoS 2 is a highly reliable optical modulator for dual wavelength laser applications. [ABSTRACT FROM AUTHOR]