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.
