Optimum Amplifier Design for Space Solar-Pumped Laser

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  • OOSAWA Kento
    Graduate Program of Electrical and Electronic Engineering, Graduate School of Engineering, University of Fukui,

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  • 宇宙太陽光励起レーザーの増幅システム最適化設計

Abstract

A laser space solar power system (L-SSPS) supplies solar power in space to the earth by the laser beams at the giga-watt level in total. The amplifier of this system is required to output a large diameter beam and have good thermal resistant. Since an active-mirror amplifier meets these requirements, we calculated the 8-pass amplification of an active-mirror amplifier for continuous optical loss. In space, the laser medium must operate at high temperature. We assumed the temperature of the laser medium was 400 K for achieve higher more than 80% extraction efficiency. We chose the medium thickness was 0.3 cm and the number of slabs were 187, 20.21% laser efficiency was achieved. The optimized laser output strength was 3.1 kW/cm 2 per unit. We analyzed the effect of the optical wave front distortion caused by the pump distribution and determined the optimum overall amplifier design.

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