20 W, 15 ns High-repetition-rate and high-beam-quality MOPA laser by spherical aberration self-compensation at 1342 nm.

Ye, Zhibin; Li, Xiaoran; Jiang, Shu; Wu, Fei; Huang, Meng; Hu, Hanmin; Qi, Yunxuan; Liu, Bin; Yan, Hengfeng

A master oscillator power amplifier (MOPA) pulsed laser operating at 1342 nm is demonstrated. It consists of an acousto-optical (A-O) Q-switched oscillator and two-stage Nd: YVO4 power amplifiers. The spherical aberration self-compensation technique is used in the second stage amplifier to obtain high-beam-quality laser output. The maximum average output power of 20.4 W is obtained with the oscillator power of 2.0 W and the total pump light power of 184.08 W, corresponding to an optical-optical efficiency of 11.08%. The repetition rate and pulse width are 100 kHz and 14.8 ns, respectively. The beam quality factor is Mx2=1.45 and My2=1.34. According to our knowledge, this is the maximum output power with a pulse width of ten-nanoseconds level and repetition rate of one-hundred-kilohertz level by an A-O Q-switch at the wavelength of 1342 nm.

POWER amplifiers; PULSED lasers; QUALITY factor; LASERS; Q-switched lasers

Applied Physics B: Lasers & Optics, 2024, Vol 130, Issue 7, p1

0946-2171

Academic Journal

10.1007/s00340-024-08269-y