Conduction cooled narrow linewidth sub-nanosecond multi-beam laser

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/Cr 4+ :YAG microchip laser as th...

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Bibliographic Details
Published in:Optoelectronics letters 2021-09, Vol.17 (9), p.518-522
Main Authors: Cheng, Yong, Tan, Chaoyong, Liu, Xu, Chen, Xia, Zhu, Mengzhen, Wei, Jingsong
Format: Article
Language:English
Subjects:
Conduction cooling
Laser arrays
Laser cooling
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Power amplifiers
Transmission efficiency
YAG lasers
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Summary: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/Cr 4+ :YAG microchip laser as the master oscillator and a high efficient grazing incidence Nd:YVO 4 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%.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-021-0167-6