Laser cooling in materials with high concentration of erbium

Zameer Hasan; Zhengle Qiu; Jonathan Lynch

doi:10.1117/12.879414

9 February 2011 Laser cooling in materials with high concentration of erbium

Zameer Hasan, Zhengle Qiu, Jonathan Lynch

Proceedings Volume 7951, Laser Refrigeration of Solids IV; 79510E (2011) https://doi.org/10.1117/12.879414
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Laser cooling of solids has many potential applications in communications, surveillance and medical science, etc. This paper reviews our recent work on laser refrigeration of solids in stoichiometric hexa-chloroelpasolite crystals with high concentrations of erbium. Our results are one to two orders of magnitude improvements over any previously reported cooling in erbium based materials. We have seen bulk crystal cooling by as low as 6 degrees Celsius below room temperature in elpasolite crystals. The high efficiency and low temperatures of cooling have been attributed to a high concentration of erbium, as high as 80% by formula, in the crystal. This cooling has been achieved by pumping near the IR transition at 870 nm which is the weakest transition of erbium. We report cooling in the 1.5 micron transition as well, using a diode laser to pump this transition. The result is cooling by only a fraction of a degree from room temperature.

Citation Download Citation

Zameer Hasan, Zhengle Qiu, and Jonathan Lynch "Laser cooling in materials with high concentration of erbium", Proc. SPIE 7951, Laser Refrigeration of Solids IV, 79510E (9 February 2011); https://doi.org/10.1117/12.879414

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