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Laser cooling under ambient conditions in Yb3+:KYW
Author(s): Laura B. Andre; Long Cheng; Alexander J. Salkeld; Luis H. C. Andrade; Sandro M. Lima; Junior R. Silva; Stephen C. Rand
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Paper Abstract

We report the first observation of laser cooling in 1%Yb3+:KYW and discuss factors that limit the cooling efficiency. Cooling by 10 K from room temperature at atmospheric pressure was achieved in this crystal at a wavelength of 1025 nm using 8 W from a seeded fiber amplifier. The temperature of the sample was measured using a calibrated differential luminescence thermometry method and was verified with a thermal camera. Infrared imagery and 3-D modeling were used to analyze the impact of thermal conduction, thermal convection, black-body radiation, and background impurities. The simulated results agree with experimental measurements confirming that the chief limitation of laser cooling at room temperature and atmospheric pressure is thermal conduction from sample supports. Best results were obtained for samples mounted on silica aerogel. Theoretical improvement of cooling efficiency in vacuum by exploiting impurity absorption saturation is also discussed.

Paper Details

Date Published: 1 March 2019
PDF: 8 pages
Proc. SPIE 10936, Photonic Heat Engines: Science and Applications, 109360E (1 March 2019); doi: 10.1117/12.2507325
Show Author Affiliations
Laura B. Andre, Univ. of Michigan (United States)
Long Cheng, Univ. of Michigan (United States)
Alexander J. Salkeld, Univ. of Michigan (United States)
Luis H. C. Andrade, Univ. Estadual de mato Grosso do Sul (Brazil)
Sandro M. Lima, Univ. Estadual de mato Grosso do Sul (Brazil)
Junior R. Silva, Univ. Estadual de mato Grosso do Sul (Brazil)
Stephen C. Rand, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 10936:
Photonic Heat Engines: Science and Applications
Denis V. Seletskiy; Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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