11 March 2013 Progress towards cryogenic temperatures in intra-cavity optical refrigeration using a VECSEL
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Proceedings Volume 8638, Laser Refrigeration of Solids VI; 863805 (2013) https://doi.org/10.1117/12.2005098
Event: SPIE OPTO, 2013, San Francisco, California, United States
Abstract
We report on the use of a high power InGaAs quantum well vertical external-cavity surface-emitting laser (VECSEL) emitting at a wavelength of 1020 nm for intra-cavity cooling of a 5% Yb-doped YLF crystal to 148 K from room temperature. Similar crystals have now reached temperatures below the NIST-defined cryogenic temperature of 123 K when pumped outside a laser cavity. We 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.
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Alexander R. Albrecht, Mohammadreza Ghasemkhani, Jeffrey G. Cederberg, Denis V. Seletskiy, Seth D. Melgaard, Mansoor Sheik-Bahae, "Progress towards cryogenic temperatures in intra-cavity optical refrigeration using a VECSEL", Proc. SPIE 8638, Laser Refrigeration of Solids VI, 863805 (11 March 2013); doi: 10.1117/12.2005098; https://doi.org/10.1117/12.2005098
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