Microscale heat transfer in thermally stimulated nonlinear optical materials

Richard A. Whalen; Gregory J. Kowalski

doi:10.1117/12.363866

4 October 1999 Microscale heat transfer in thermally stimulated nonlinear optical materials

Richard A. Whalen, Gregory J. Kowalski

Proceedings Volume 3798, Power-Limiting Materials and Devices; (1999) https://doi.org/10.1117/12.363866
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The significance of microscale heat transfer mechanisms during short pulsed laser radiation of thermally stimulated nonlinear optical material is investigated. Significant differences occur between the temperature predictions of the diffusion equation and microscale model. The temperature response effects the index of refraction gradient and results in large differences in the predicted instantaneous transmittance values of the laser beam. The results show that the percentage difference error in the calculated average transmittance value for the two models will decrease from over 30% initially, to less than eight percent after four times the material relaxation time, (tau) , has passed. The material relaxation time is related to the sonic velocity in the material. The results demonstrate that the microscale heat transfer mechanism dominates for times less than 4(tau) . The diffusion or Fourier heat transfer mechanism should be used only when the laser pulse duration is much longer than the material relaxation time.

Citation Download Citation

Richard A. Whalen and Gregory J. Kowalski "Microscale heat transfer in thermally stimulated nonlinear optical materials", Proc. SPIE 3798, Power-Limiting Materials and Devices, (4 October 1999); https://doi.org/10.1117/12.363866

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