N51-type Nd-doped phosphate laser glass is recently developed at Shanghai Institute of Optics and Fine Mechanics, China, especially for high-power laser applications. One multiphysics model is utilized to simulate the thermal recovery process of a single large-sized N51 amplifier, 810×460×40 mm3 slab with 12 mm thick edge cladding. The change of the average temperature with time, as well as the temperature at five points located at the center, long and short edge side, corner of the laser slab, and center of the edge cladding, are numerically simulated and discussed. On the thermal recovery, the slab equilibration time and the self-equilibration time are determined by the average temperature and the maximum temperature difference with a function of recovery time, respectively. For the whole slab, the temperature distribution, temperature gradient distribution, and thermal stress distribution during the thermal recovery process after a single but strong pumping are also numerically simulated by the transient-analysis method. Based on these numerical data of the N51 laser slab, it is suggested that N51 would be applied in high power laser systems with a better thermal recovery performance, as well as a higher stimulated emission cross section.
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