In this paper we investigate the effect of two incoherent steps on the statistical properties of cascade lasers without and with inversion. It is demonstrated that the noise in the intensity difference may be reduced 50% below the shot noise. A simple physical explanation of the mechanism for squeezing is given.

Acta Physica Sinica (Overseas Edition)Dec 1, 19980 citations

Squeezed Cascade Two-Quantum-Beat Lasers

Xiangming Hu, Jin-sheng Peng

Noise squeezing of intensity difference between the pair of sum modes may be generated in a cascade laser of Λ and V quantum-beats. The best achievable squeezing is up to 50% below the shot noise limit. This new kind of squeezed lasers has potential for quantum communications and precision measurements.

Chinese Physics LettersSep 1, 19993 citations