CHENG Yong,TAN Chaoyong,LIU Xu,CHEN Xia,ZHU Mengzhen,WEI Jingsong.Conduction cooled narrow linewidth sub-nanosecond multi-beam laser[J].Optoelectronics Letters,2021,17(9):518-522 Conduction cooled narrow linewidth sub-nanosecond multi-beam laser Author Name Affiliation CHENG Yong  Ordnance NCO Academy, Army Engineering University, Wuhan 430075, China  TAN Chaoyong  Ordnance NCO Academy, Army Engineering University, Wuhan 430075, China  LIU Xu  Ordnance NCO Academy, Army Engineering University, Wuhan 430075, China  CHEN Xia  Ordnance NCO Academy, Army Engineering University, Wuhan 430075, China  ZHU Mengzhen  Ordnance NCO Academy, Army Engineering University, Wuhan 430075, China  WEI Jingsong  Ordnance NCO Academy, Army Engineering University, Wuhan 430075, China  Abstract:       A conduction cooled high peak power, narrow linewidth, and sub-nanosecond multi-beam laser as an excellent candidate for non-scanning lidar is demonstrated. This laser is based on master oscillator power amplifier (MOPA) scheme which consists of a pulse pumped Nd:YAG/Cr4+:YAG microchip laser as the master oscillator and a high efficient grazing incidence Nd:YVO4 slab amplifier, and the output beam is expanded to 100 mm diameter by a 50× low aberration Galileo beam expander and then divided into a 50×2 staggered arrangement multi-beam array by a diffractive laser splitter. The laser operates at 1 064.28 nm with a spectral linewidth about 20 pm, which generates 1 mJ, 0.78 ns pulses at 7 kHz rate. The fluctuation of output power is less than ±2% when it works continuously for 1 h. The energy uniformity of the 100 sub-beams is up to 90%, the divergence of each sub-beam is about 20 μrad, and the total transmission efficiency of the diffractive laser splitter is more than 85%. Hits: 734 Download times: 72 View Full Text    Download reader