Enhancement of laser cooling efficiency in rare-earth-doped oxide at elevated high temperature

Yuta Nakayama; Yukihiro Harada; Takashi Kita

doi:10.1117/12.2545460

24 February 2020 Enhancement of laser cooling efficiency in rare-earth-doped oxide at elevated high temperature

Yuta Nakayama, Yukihiro Harada, Takashi Kita

Proceedings Volume 11298, Photonic Heat Engines: Science and Applications II; 112980B (2020) https://doi.org/10.1117/12.2545460
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

We demonstrated an enhancement of the ideal laser-cooling efficiency in Yb-doped yttrium aluminum garnet, (Yb:Y)AG, and Er-doped yttrium aluminum garnet, (Er:Y)AG, ceramic discs above 300 K. The temperature-dependent photoluminescence (PL) spectrum indicates that the phonon-assisted energy transfer from the narrowband, resonant state into the inhomogeneously distributed energy states is enhanced with increasing the temperature. The enhanced ideal cooling efficiency of the (Yb:Y)AG ceramic disc and the (Er:Y)AG ceramic disc at 470 K is 1.7 times higher than that at 300 K. The enhanced ideal cooling efficiency of (Er:Y)AG at 470 K marked 4.0% which is 1.8 times higher than that of (Yb:Y)AG.

Citation Download Citation

Yuta Nakayama, Yukihiro Harada, and Takashi Kita "Enhancement of laser cooling efficiency in rare-earth-doped oxide at elevated high temperature", Proc. SPIE 11298, Photonic Heat Engines: Science and Applications II, 112980B (24 February 2020); https://doi.org/10.1117/12.2545460

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