Novel materials for laser refrigeration

Markus P. Hehlen

doi:10.1117/12.809091

12 February 2009 Novel materials for laser refrigeration

Markus P. Hehlen

Proceedings Volume 7228, Laser Refrigeration of Solids II; 72280E (2009) https://doi.org/10.1117/12.809091
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

The status of optical refrigeration of rare-earth-doped solids is reviewed, and the various factors that limit the performance of current laser-cooling materials are discussed. Efficient optical refrigeration is possible in materials for which hω_max < E_p/8, where hω_max is the maximum phonon energy of the host material and E_p is the pump energy for the rare-earth dopant. Transition-metal and OH- impurities at levels >100 ppb are believed to be the main reason for the limited laser-cooling performance in current materials. The many components of doped ZBLAN glass pose particular processing challenges. Binary fluoride glasses such as YF3-LiF are considered as alternatives to ZBLAN, and the crystalline system KPb₂Cl₅ :Dy³⁺ is identified as a prime candidate for high-efficiency laser cooling.

Citation Download Citation

Markus P. Hehlen "Novel materials for laser refrigeration", Proc. SPIE 7228, Laser Refrigeration of Solids II, 72280E (12 February 2009); https://doi.org/10.1117/12.809091

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