Research on Nd∶YAG solid-state laser with extracavity rotatory pumping
Thermal management in solid-state lasers is still a challenge in the development of high-energy laser systems.Introducing relative motion between the pump beam and the gain medium in the laser system is an efficient thermal management scheme.The temperature distribution of Nd∶YAG crystal was analyzed by means of finite element numerical simulation for static pumping,rotating gain medium pumping and pump-beam rotating pumping.Rotated at 800 r/min with standard heat-sinking cooling the disk temperature increased by only 16℃reaching a maximum temperature of～36℃,which is much lower than～142℃at static pumping.Experimentally,we designed and demonstrated a Nd∶YAG laser with the extracavity rotatory pumping,and obtained a 12.2 W output of 1064 nm with a slope efficiency of 37.2%,which is greater than the 35.1%at static pumping.The experimental results were coinciding with the theoretical simulation.The study shows that the solid state laser with extracavity rotatory pumping displays greatly enhanced thermal control.
extracavity rotatory pumpingNd∶YAG lasersthermal effectfinite element analysis
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