New Materials for Optical Cooling
NAVAL RESEARCH LAB WASHINGTON DC PHOTONICS TECHNOLOGY BRANCH
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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 KGdWO42 confirm anti-Stokes fluorescence cooling. This is the first observation of optical cooling in a crystal.
- Lasers and Masers