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Efficient optical refrigeration in Yb3+:YLiF4 at cryogenic temperatures via pulsed excitation

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Abstract

A theoretical cooling scheme based on pulsed excitation is presented to facilitate efficient optical refrigeration at cryogenic temperatures. The mechanism of optical refrigeration with pulsed excitation is described by a simplified cooling model founded on a density matrix. Simulated results show that for the Yb3+:YLiF4 crystal with doping concentration of 10% and background absorption of 104cm1, optical refrigeration via picosecond pulsed excitation is competitive at a temperature of lower than 100 K due to its high cooling efficiency and may advance the cooling temperature to the boiling point of nitrogen.

© 2018 Optical Society of America

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