Author Affiliations
Abstract
1 Center for Photonics and Electronics, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
2 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
A 21.2 kW, 1.94 times the diffraction-limit quasi-continuous-wave laser is presented in this Letter based on a multi-stage, power-scalable Yb:YAG master-oscillator-power-amplifier (MOPA) system under adaptive optics (AO) control. The output laser of the MOPA system is a rectangular beam with a length-width ratio of 2:1, a 200 μs pulse duration, and a 1000 Hz repetition rate. With the AO control system, the beam quality of the laser is improved from 4.20 to 1.94 times the diffraction limit. To our knowledge, this is the best quality laser in the 20 kW class except for combined lasers.
diode-pumped lasers ytterbium lasers adaptive optics Chinese Optics Letters
2020, 18(6): 061402
1 School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
2 School of Automation, Beijing Institute of Technology, Beijing 100081, China
This study experimentally investigated a Yb: YAG pulse laser amplifier with a high amplification gain and a high signal-to-noise ratio (SNR). The highest amplification gain of 172 and highest pulse energy of 131 mJ were obtained with the highest SNR of 24.9 dB from a volume gain of 10 mm × 10 mm × 1 mm. The output beam quality values of M2x = 1.91 in the slow axis and M2y =1.58 in the fast axis were also achieved.
laser amplifiers laser amplifiers ytterbium lasers ytterbium lasers diodepumped lasers diodepumped lasers signal-to-noise ratio (SNR) signal-to-noise ratio (SNR) Frontiers of Optoelectronics
2017, 10(1): 51
