Laser cooling under ambient conditions in Yb3+:KYW

Laura B. Andre; Long Cheng; Alexander J. Salkeld; Luis H. C. Andrade; Sandro M. Lima; Junior R. Silva; Stephen C. Rand

doi:10.1117/12.2507325

1 March 2019 Laser cooling under ambient conditions in Yb³⁺:KYW

Laura B. Andre, Long Cheng, Alexander J. Salkeld, Luis H. C. Andrade, Sandro M. Lima, Junior R. Silva, Stephen C. Rand

Proceedings Volume 10936, Photonic Heat Engines: Science and Applications; 109360E (2019) https://doi.org/10.1117/12.2507325
Event: SPIE OPTO, 2019, San Francisco, California, United States

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.

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Citation Download Citation

Laura B. Andre, Long Cheng, Alexander J. Salkeld, Luis H. C. Andrade, Sandro M. Lima, Junior R. Silva, and Stephen C. Rand "Laser cooling under ambient conditions in Yb³⁺:KYW", Proc. SPIE 10936, Photonic Heat Engines: Science and Applications, 109360E (1 March 2019); https://doi.org/10.1117/12.2507325

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