6.11 mJ Q-switched Tm: YAG laser end pumped by pulse laser diode at room temperature

The 2 m laser is in the atmosphere window and the eye-safety wavelength regions. Therefore, it is expected to have potential application in wide range of fields. The lasers can be a light source of Coherent Doppler Wind Lidars and Differential Absorption Lidars. In order to develop a laser light source of Coherent Doppler Wind Lidars, a pulse LD end pumped Q-switched Tm:YAG laser was developed by using a plano-concave cavity with a acousto-optical (AO) Q-switch. The center wavelength of the output laser was measured to be 2 014.9 nm. In the repetition frequency of 100 Hz, a maximum single energy of 6.11 mJ after Q-switching operation and the narrowest pulse width of 324.7 ns were achieved at room temperature, whose slop efficiency was 13.56%. The Mx2 was 1.31 and the My2 was 1.35.