Abstract
We report the first observation of anti-Stokes fluorescence cooling in a thulium-doped solid with pump excitation at . At a pump wavelength of and incident average power of , a :ZBLANP ( ) sample cooled to from room temperature for a single pass of the pump beam. This corresponds to an absorbed pump power of and a peak temperature change per absorbed power of from room temperature.
- Received 28 June 2000
DOI:https://doi.org/10.1103/PhysRevLett.85.3600
©2000 American Physical Society