Abstract

Among a variety of schemes for nonclassical ligh generation, the generation of sub-Poissonian photon-states with semiconductor lasers or light-emitting-diodes (LEDs) has been attracting much attention, primarily from engineering point of view. In general, sub-Poissonian photon state has been generated with the help of a high-impedance constant-current source^1-3 or series-coupled configuration.^4,s On the other hand, generation of sub-Poissonian photon state from a single p — n junction device driven by a constant-voltage source has been believed to be impossible. In this talk, we shall present our experimental results, manifesting substantial noise suppression of output photon fluxes below Standard quantum limit (SQL) level from a single LED surprisingly without recourse to high-impedance circuit at room temperature. The observed squeezing is interpreted semiquantitatively in terms of our new model including effects of microscopic backward pump process.

© 1999 Optical Society of America