Analysis of output characteristics introduced by non-uniform coolant in direct-liquid-cooled multi-disk laser

摘要

The near field of the probe beam after passing through the gain module is measured. The "streamer effect" is first discovered in the experiment, which is characterized as continuity in the flow direction and non-uniformity in the lateral direction with high spatial frequency. To explain the "streamer effect", a fluid-solid coupling model and an unstable resonator oscillation model of the direct-liquid-cooled thin-disk laser are established. The simulation results show that the non-uniformity of the coolant along the width of the flow channel gives rise to the streamer effect. A feasible cooling channel to achieve a high uniformity coolant is proposed and experimentally verified. M CW pumping of 9.6 kW, the influence of coolant on the output beam quality can be controlled at beta2.