Abstract

We report a theoretical scheme for realizing efficient and enhanced laser cooling in ${\mathrm{Ho}}^{3+}$-doped solids, based on ground-state absorption (GSA) of ${{}^5\mathrm{I}}_8\to {{}^5\mathrm{I}}_7$ at around 2.07 μm and excited-state absorption (ESA) of ${{}^5\mathrm{I}}_5\to {{}^5\mathrm{F}}_5$ at around 2.28 μm. The upconversion-quenching-induced heat that usually is found in ${\mathrm{Ho}}^{3+}$ optical refrigeration can be significantly alleviated by using the copumping scheme, so the cooling power density and the cooling efficiency are greatly improved. The scheme works at temperatures above 133 K, and can shorten the time needed to reach the minimum attainable temperature of the cooling system. Besides, the dopant concentration is allowed to be promoted to around 1%. The copumping scheme can also be applied to other multilevel (such as ${\mathrm{Tm}}^{3+}$ and ${\mathrm{Er}}^{3+}$) optical refrigeration systems to improve the cooling performance.

© 2014 Optical Society of America

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