Simulations of the exciplex pumped alkali laser using temperature-dependent energy pooling reactions

D. L. Carroll

doi:10.1117/12.2652920

7 November 2022 Simulations of the exciplex pumped alkali laser using temperature-dependent energy pooling reactions

D. L. Carroll

Proceedings Volume 12347, XXIII International Symposium on High Power Laser Systems and Applications; 1234704 (2022) https://doi.org/10.1117/12.2652920
Event: XXIII International Symposium on High Power Laser Systems and Applications, 2022, Prague, Czech Republic

Abstract

Parametric measurements of pulsed output energy from the four-level Cs-Ar exciplex pumped alkali laser (XPAL) as a function of input pump energy and temperature show a strong dependence on temperature. The data shows a D₂ line laser performance increase with temperature towards a peak efficiency, followed by a decrease as temperature is increased beyond the peak performance point. The efficiency was highest with Cs-Ar in the temperature range 493 – 513 K. Prior simulations of Cs-Ar XPAL measurements indicated that energy pooling from the 6p ²P_3/2 state of Cs was significant at higher temperature and it was hypothesized that the addition of temperature-dependent reaction rates may be important. This paper presents BLAZE Multiphysics™ simulations using temperature-dependent energy pooling reaction rates baselined to available experimental rate data. These calculations show that the temperature-dependent energy pooling rates explain the rise and fall of Cs-Ar XPAL performance with temperature with reasonable accuracy. Longer pulse simulations are also presented that show a significant increase in optical-to-optical efficiency, but also exhibit a faster decay at higher cell temperatures due to the increased impact from energy pooling. Estimates of temperature-dependent energy pooling reaction rates are presented for Rb and K.

Citation Download Citation

D. L. Carroll "Simulations of the exciplex pumped alkali laser using temperature-dependent energy pooling reactions", Proc. SPIE 12347, XXIII International Symposium on High Power Laser Systems and Applications, 1234704 (7 November 2022); https://doi.org/10.1117/12.2652920

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