THE THEORY OF ATOM LASERS

Lorenzo M. Narducci, Eduardo Jaime Quel, Jorge R. Tredicce

PAN SHAO-HUA, 中国科学院物理研究所

The semiclassical laser theory proposed by Lamb for two-level system is extended to the case of dye lasers. Mode coupling equations are deduced, and a discussion is given.

Tobias Kramer, Mirta Rodríquez Pinilla, Christian Bracher

Yvan Castin, Maxim Olshanii, Jean Dalibard

A. Crubellier

The essential characteristics of superradiance are described by using two simple models, the Dicke model and the semi-classical model. The main extensions to realistic situations are also presented and the possibility of superradiance theory being a starting point of a general approach of X-ray coherent emission is discussed.

Xiangming Hu, Wang Dexin, 华中师范大学物理系,武汉,430070

In this paper, a two-photon laser by optical pumping, with two-photon losses, is studied by means of the Langevinian theory, the langevinian equation is obtained. Then the steady-state average photon number, the frequency pulling, the linewidth and the dynamical Stark effect are obtained. From the analysis of the gain, it is shown that, for the incoherent pumping, only the two-step process of single-and two-photon gives contribution. And for the coherent pumping, in addition, the one-step process of single and two-photon also contributes. And two processes are confined by the negative-feedback and saturation. The linewidth is independent of the steady state average photon number.