Intracavity-enhanced optical refrigeration of Yb:YLF crystal to cryogenic temperatures

Mohammadreza Ghasemkhani; Alexander R. Albrecht; Seth D. Melgaard; Denis V. Seletskiy; Jeffrey G. Cedeberg; Mansoor Sheik-Bahae

doi:10.1117/12.2080343

10 March 2015 Intracavity-enhanced optical refrigeration of Yb:YLF crystal to cryogenic temperatures

Mohammadreza Ghasemkhani, Alexander R. Albrecht, Seth D. Melgaard, Denis V. Seletskiy, Jeffrey G. Cedeberg, Mansoor Sheik-Bahae

Author Affiliations +

Proceedings Volume 9380, Laser Refrigeration of Solids VIII; 938003 (2015) https://doi.org/10.1117/12.2080343
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

Laser cooling of solids has great potential to achieve an all-solid-state optical cryo-cooler. The advantages of compactness, no vibrations, no moving parts or fluids, and high reliability have motivated intensive research. Increasing the pump power absorption is essential to reach lower temperatures. Here, using a high power broadly tunable InGaAs/GaAs vertical external-cavity surface-emitting laser (VECSEL) we demonstrate how we have increased the pump power absorption in an intra-cavity geometry cooling a 10% Yb:YLF crystal. We also discuss the progress, advantages, and challenges of laser cooling inside a VECSEL cavity, including the VECSEL active region design, cavity design, and cooling sample choice for optimal cooling. A novel method to increase the absorption of the pump power in the crystal has also been proposed.

Citation Download Citation

Mohammadreza Ghasemkhani, Alexander R. Albrecht, Seth D. Melgaard, Denis V. Seletskiy, Jeffrey G. Cedeberg, and Mansoor Sheik-Bahae "Intracavity-enhanced optical refrigeration of Yb:YLF crystal to cryogenic temperatures", Proc. SPIE 9380, Laser Refrigeration of Solids VIII, 938003 (10 March 2015); https://doi.org/10.1117/12.2080343

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