The high energy spaceborne all-solid-state lasers based on fluid-loop cooling system

Abstract

We demonstrate a 532.2 nm high-power all-solid-state pulse laser with a repetition rate of 85 Hz, a single pulse energy of 215.8 mJ. The lasers spot size is (3.8, 3.6) mm, and the divergence angle is (0.57, 0.69) mrad. The stable working state of this laser last for 402 s and the pointing stability of the output beam is better than 50 μrad. A fluid loop system based on phase-change energy-storage heat exchanger is designed in this paper in order to solve several key problems induced by the heat dissipation. The laser is working normally in orbit, and it lays the foundation for the development of spaceborne all solid-state laser with high-energy, high-repetition rate.