Refrigeration – Processes
Patent
1995-09-25
1997-04-01
Wayner, William E.
Refrigeration
Processes
62264, 62467, F25B 2100, F25D 2300
Patent
active
056155581
ABSTRACT:
A device and method for laser cooling of a solid to extremely low temperature is disclosed, the device including an active cooling structure having a high purity surface passivated direct band gap semiconductor crystal of less than about 3 microns thick and a transparent hemispherical body in optical contact with the crystal. The crystal is itself cooled when illuminated with a laser beam tuned to a frequency no greater than the band gap edge frequency of the crystal. Cooling is caused by emission of photons of higher energy than photons entering the crystal, the additional energy being accounted for by process of absorption of thermal phonons from the crystal lattice.
REFERENCES:
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Cornell Eric A.
Renn Michael J.
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