New materials for optical cooling |
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| Authors: | S.R. Bowman C.E. Mungan |
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| Affiliation: | (1) Photonics Technology Branch, Naval Research Laboratory, Washington, DC 20375-5320, USA (E-mail: bowman@ccf.nrl.navy.mil), US;(2) Department of Physics, U.S. Naval Academy, Annapolis, MD 21402, USA, US |
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| Abstract: | Well-characterized solid-state laser materials are evaluated for performance in optical refrigeration as well as radiation-balanced laser systems. New figures-of-merit are developed and applied to ytterbium-doped materials. Superior performance is predicted for high-cross-section tungstate materials. Photothermal deflection experiments on samples of Yb3+-doped KGd(WO4)2 confirm anti-Stokes fluorescence cooling. This is the first observation of optical cooling in a crystal. Received: 1 February 2000 / Revised version: 15 June 2000 / Published online: 13 September 2000 |
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| Keywords: | PACS: 42.55.Rz 42.70.Hj |
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