A high-beam-quality passively Q-switched 2 μm solid-state laser with a WSe2 saturable absorber. (May 2020) - Li, Linjun
Highlights: A passive Q-switched operations of a Tm:YAP laser with a WSe2 saturable absorber was firstly demonstrated. A 11.3-µJ pulse energy and a 28.9-W peak power were achieved from a PQS WSe2 -based Tm:YAP laser. A pulse width of about 392.7 ns from PQS WSe2 -based Tm:YAP laser was achieved in the experiment. Abstract: In this paper, using the new WSe2 nanosheets as the saturable absorber (SA), a passively Q-switched (PQS) Tm:YAP laser was faultlessly realized. A 1.29-W average output power at 1988.3 nm and a 392.7-ns pulse duration were obtained with a 12.3% optical conversion efficiency, and a 11.3-µJ pulse energy and a 28.9-W peak power were gained with a 12.5-W pump power. In addition, the beam quality factors of Tm:YAP laser in X and Y directions were less than 1.2 under continuous wave (CW) and PQS mode.