Squeezed-reservoir lasers

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Abstract
The effects of squeezing the reservoir coupled to the atoms of a laser are compared with the effects of squeezing the electromagnetic vacuum modes entering the laser cavity. The analysis includes the semiclassical theory, a calculation of the phase diffusion rate and the laser linewidth in the rotating-wave van der Pol model of the laser, and squeezing spectra calculated from a linearized theory without adiabatic elimination of the atoms. It is demonstrated that good squeezing is achievable in the laser output if an appropriate classical field driving the atoms is added.