We describe a mechanism for cooling semiconductors via laser excitation, radiative recombination, and efficient coupling of the emitted light. Preliminary experimental results on lattice matched InGaAs/InP with an indexmatching silicon lens are presented. The external radiative efficiency of the structure is approximately 49% at room temperature, a record high for spontaneous emission at this technologically important wavelength (1.6 µm coincides with a major optical communications band). While this efficiency is well below that required for refrigeration, extrapolation to 77K bodes well for laser cooling in this device.

© 1998 Optical Society of America

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