Abstract

It has been shown by Imamoglu, Field and Harris¹ that electromagnetically induced transparency can be used to achieve laser action without inversion. We have analyzed the quantum noise properties of the laser without inversion and shown that the intensity fluctuations in the laser output may be reduced 50% below the shot noise limit². In recent work Makuta, Marmet and Stoicheff³ have shown that a resonantly enhanced second order susceptibility with reduced absorption at the second reduced harmonic wavelength may be achieved by electromagnetically induced transparency induced with a dc-electric field. We have calculated the photon statistics of the second harmonic light and found that near 100% amplitude squeezing can be achieved in the output at the second harmonic. We have shown that driven A model atoms in an optical cavity can reduce the amplitude fluctuation of a strong coherent input light field into the cavity by almost 100% without significantly depleting the input signal.

© 1993 Optical Society of America