Systematic description of laser phase by linearized Ito equations.
We show that well above threshold the use of linearized Ito quantum stochastic differential equation allow a systematic description of all quantum stochastic properties of laser light including the phase properties. This is accompanied by the use of mixed field-atom operators which are phase independent and around whose finite mean values we may linearize. As a consequence wee are able to derive an equation for an operator describing the phase properties of the laser light
Experimental and theoretical study of linewidth narrowing in Brillouin fiber ring lasers
In Brillouin fiber lasers, the phase fluctuations of the pump laser are transferred to the emitted Stokes field after being strongly reduced. The result is a linewidth narrowing that we study both experimentally and theoretically. We derive simple expressions to connect the linewidths of the waves interacting in the fiber, and we show that the magnitude of the narrowing effect depends only on the acoustic damping rate and the cavity loss rate. We successfully compare these theoretical predictions with experimental results obtained by recording the response of a Brillouin fiber ring laser to frequency modulation of the pump field.
Role of pumping statistics in maser and laser dynamics: Density-matrix approach.
We discuss in detail the influence that the statistical properties of the pump source have on maser and laser dynamics. We derive a general master equation for the radiation field that is valid for a wide range of different pump mechanisms. If the pump noise is eliminated, we find that the photon number noise in a micromaser and a laser can be significantly reduced below the shot-noise level. In contrast, the phase fluctuations for both maser and laser are unaffected by the noise contribution of the pump.