Anti-Stokes luminescence in heavily doped semiconductors as a mechanism of laser cooling |
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Authors: | P G Eliseev |
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Institution: | (1) Centre for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, NM 87106, USA |
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Abstract: | The anti-Stokes luminescence is a mechanism of the optical refrigeration in semiconductor light sources. The heavily doped
semiconductors are considered as a material for the laser cooling. The limitation of this mechanism appears to be connected
with a transition from the non-degenerate to degenerate occupation. This transition occurs at higher pumping rate (along with
the transition to the optical gain and lasing) and at lower temperature. Thus, the limit for the laser cooling can be indicated.
The minimal obtainable temperature is about 60–120 K depending on the doping level. The laser cooling of a semiconductor is
impeded by the difficulty of extracting the spontaneous emission from a radiating body that is characterized by large angle
of the total internal reflection. |
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Keywords: | optical refrigeration laser cooling semiconductors anti-Stokes luminescence |
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