Thermal effect of cryogenic Yb:YAG total-reflection active-mirror laser

H. Furuse; J. Kawanaka; N. Miyanaga; T. Saiki; M. Fujita; K. Imasaki; K. Takeshita; S. Ishii; Y. Izawa

doi:10.1117/12.840599

17 February 2010 Thermal effect of cryogenic Yb:YAG total-reflection active-mirror laser

H. Furuse, J. Kawanaka, N. Miyanaga, T. Saiki, M. Fujita, K. Imasaki, K. Takeshita, S. Ishii, Y. Izawa

Proceedings Volume 7578, Solid State Lasers XIX: Technology and Devices; 75780I (2010) https://doi.org/10.1117/12.840599
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

We report total-reflection active-mirror laser experiments by using a cryogenic Yb:YAG composite ceramic. The composite ceramic has no high reflection coating on the bottom surface, and is cooled with liquid nitrogen directly. We obtained 273 W output power with optical efficiency of 65% and slope efficiency of 72% against the absorbed pump power. The laser power and optical efficiency will be improved more when the pump power increases further. To investigate thermal effects of the laser material in more detail, we have measured the thermal lens focal length and the temperature of Yb:YAG. We observed thermal lensing effect of f ~ 2000 mm, and the maximum temperature of 150 K for 400 μm-thick Yb:YAG sample. We have also studied the theoretical analysis of thermal distribution in the composite ceramic.

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H. Furuse, J. Kawanaka, N. Miyanaga, T. Saiki, M. Fujita, K. Imasaki, K. Takeshita, S. Ishii, and Y. Izawa "Thermal effect of cryogenic Yb:YAG total-reflection active-mirror laser", Proc. SPIE 7578, Solid State Lasers XIX: Technology and Devices, 75780I (17 February 2010); https://doi.org/10.1117/12.840599

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