Generalized coherent states and the statistics of two-photon lasers

Yuan, Hong-Chun, Xu +3 more

Hong‐Chun Yuan, Xue-xiang Xu, Hong-Yi Fan

В. Н. Горбачев, Andrew I. Trubilko

When pumping produces atomic coherence on working levels or atomic polarization two-level atom can generate the light without inversion. In such systems one- and two-photon generation of the light is considered for the laser and micromaser operation. Using Lamb-Scully model generalized for coherent pumping statistics of the light is considered. Two-photon laser operation is found to be phase squeezed and perfect noise reduction can be achieved. In maser a set of steady state of subpoissian photon statistics is found. For these states the noise reduction up to 60 percent can be obtained if inversion is zero. Phase squeezing in micromaser is found.

Muhammad Suhail Zubairy

Wilhelm Becker, Muhammad Suhail Zubairy

A fully quantized theory of the free-electron laser in the small-signal regime is presented which allows for a calculation of the photon statistics. For an initial vacuum, we find photon antibunching if the electron momentum is below resonance. We conjecture that, in general, the free-electron laser preserves coherent states only in the absence of gain.

M. P. Sharma, P. R. P. Silva