Transient temperature rise in a repeat pulse pumped solid-state laser tube
The 3-dimensional transient temperature distribution in a tube YAG laser pumped by repeat pulses was studied by experiment and simulation. The result shows that the transient temperature in the tube increases with the number of pump pulses like a saw-toothed curve at the beginning of pumping, and the position of the maximum transient temperature shifts from the inner surface to the inside of the tube. After about 490 pulses, the transient temperature in the tube changes repeatedly with the same frequency of the pump pulse, and the position of the maximum transient temperature occurs at a fixed point. At this time, the temperature inside the tube is higher than that at the inner-or outer-surface of the tube, and the temperature at the inner surface is higher than that at the outer surface.