Abstract
In vacuo laser cooling of a solid from 301 to 236 K has been demonstrated. The sample consists of a cladded, multimode optical fiber fabricated from the fluorozirconate glass ZBLANP; the fiber’s waveguiding core is doped with 1 wt. % ions. Cooling of the host glass results from anti-Stokes fluorescence of following optical pumping in the long-wavelength tail of the ion’s absorption spectrum . Measurement of the time constant for equilibration of the sample temperature is in excellent agreement with an analytic calculation of this quantity.
© 1999 Optical Society of America
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