Abstract
The basic mechanism for laser refrigeration is illustrated in Fig. 1. Laser light tuned close to the band edge in a semiconductor is absorbed and “cold” carriers at the bottom of their respective bands are created. The carriers are heated as they equilibrate thermally with the lattice on a picosecond timescale. On a longer timescale, the carriers recombine and emit light which is blue shifted relative to the incoming laser light, the excess energy being extracted from the lattice. This method of optically injecting carriers into heterostructures has major advantages over cooling methods proposed earlier1 employing semiconductor diodes.
© 1995 Optical Society of America
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