Single longitudinal mode Nd:YVO4 laser with mode selection based on pre-laser Q-switching and dual Fabry-Perot etalons

Lasers operating in a single longitudinal mode exhibit narrow spectral linewidths and excellent stability, making them highly valuable for practical applications in fields such as nonlinear optics, quantum computing, and gas detection. This paper reports a 1064 nm pulsed Nd:YVO₄ single longitudinal mode laser based on the combined mode selection of pre-laser Q-switching and dual Fabry-Perot (F-P) etalons. A rate equation model for combined mode selection is being established, and the particle number variation during the laser output process is being simulated. Pre-laser Q-switching mode selection experiments are conducted. Additionally, combined mode selection experiments integrating pre-laser Q-switching with dual F-P etalons are performed. In the combined mode selection experiment, a single longitudinal mode output at 1064.1 nm is obtained with a repetition frequency of 10 kHz, achieving a peak output power of 0.862 W. The laser exhibits a pulse duration of 36.03 ns and a spectral linewidth of 58.5 MHz. The findings from the experiment align well with the outcomes predicted by the simulation. This provides a stable, low-cost and easy-to-operate technical solution for future research on single longitudinal mode lasers.