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%.
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This work has been supported by the National Science and Technology Major Project of China (No.2014ZX01005-101-003), the National Natural Science Foundation of China (No.61705268), and the Science and Technology Innovation Project of Army Engineering University (No.KYWHJQZL2002).
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Cheng, Y., Tan, C., Liu, X. et al. Conduction cooled narrow linewidth sub-nanosecond multi-beam laser. Optoelectron. Lett. 17, 518–522 (2021). https://doi.org/10.1007/s11801-021-0167-6
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DOI: https://doi.org/10.1007/s11801-021-0167-6