Pulsed laser diode dual-end pumped double-end bonded Tm:YAG transient thermal effect analysis

Based on heat transfer differential equations, by using integral transform we got the internal temperature distribution of pulse LD dual-end pumped Tm: YAG crystal and the thermal focal length of crystal was obtained by the temperature field. At pumped power of 11W and repetition rate of 100Hz, the maximum temperature inside crystal is 27.68°C. As repetition frequency varying from 100Hz to 200Hz, the maximum temperature inside crystal is increasing to 28.24°C. In the case of duty cycle unchanged, as the repetition rate increases, the thermal focal length is distributed in a saw-tooth pattern and gradually becomes shorter, eventually it tends to be periodical distribution. The theoretical analysis of the thermal focal of pulse LD dual-end pumped Tm: YAG crystal is demonstrated by the comparison between the theoretical results and the experimental results. (paper)