Research on single longitudinal mode laser based on F-P etalon and Q-switched delay

Single longitudinal mode laser has been widely used in optical measurement and communication by virtue of high monochromaticity, high coherence, and high beam quality. In this paper, two Fabry-Perot resonators, F1 and F2, with thickness of 1.65 mm and 10 mm respectively and Q-switched delaying were used to select single longitudinal. The results show that when the incident angle for F1, F2 is 0.5° and 0.9° respectively, and the electro-optic Q switched delaying is properly extended, the laser can output with single longitudinal mode at a repetition rate of 10 Hz, which the output energy is 1.03 mJ, pulse width is 13.2 ns, the power stability is better than 3% in 4 h test.