The influence of output mirror transmittance on the output characteristics of a dual-wavelength twin-pulse laser under intra-cavity gain-switching pump operation

Abstract

In this study, we report a dual-wavelength twin-pulse laser operating at 912 nm and 1064 nm under the intracavity gain-switching pump, utilizing Nd:GdVO₄ and Nd:YVO₄ as laser gain media in conjunction with a Cr⁴⁺:YAG saturable absorber. We have established the rate equations for the laser based on intracavity gain-switched pumping and performed simulation analysis to investigate the impact of output coupler transmittance on the laser's output characteristics. In the experiments, simulation results served as key parameters for guidance. Ultimately, we utilized an output mirror with a transmittance of 2% at 912 nm and 5% at 1064 nm. At a maximum pump power of 36.8 W, we achieved a maximum repetition rate of 30.1 kHz, with pulse widths of 48.6 ns for the 912 nm laser and 38 ns for the 1064 nm laser. The experimental results are in good agreement with the simulation results.