LD end-pumped acousto-optic Q-switched 1319 nm/1338 nm dual-wavelength Nd:YAG laser

• Laser characteristics under acousto-optic Q-switched operation of 1319 nm/1338 nm were studied.
• Maximum pulse output power of 5.2 W, maximum peak power of 3.96 kW, and minimum pulse width of 65.6 ns.
• The duty ratio of ultrasonic signal should be proper. The duty ratio could not be too high to block the laser oscillation.

Laser characteristics of acousto-optic Q-switched operation of 1319 nm/1338 nm dual-wavelength composite Nd:YAG laser were studied. Maximum output power of 5.77 W was achieved in CW operation. Under Q-switched operation, the maximum peak power of 3.96 kW and minimum pulse width of 65.6 ns was obtained at repetition frequency of 20 kHz with the duty ratio of 96%. The influence of the duration of the ultrasonic field acted on the Q-switch to the output characteristics of dual-wavelength composite Nd:YAG laser had been reported first time.