Abstract

We explain in simple terms the behavior of two-photon lasers and describe recent results that have lead to the realization of the first continuous-wave two-photon optical laser. We stress the differences between one- and two-photon lasers to develop an appreciation of their dynamics and the difficulties associated with achieving two-photon lasing. It will be shown that the fundamental light-matter interactions give them a unique threshold behavior and that competing nonlinear optical processes make it difficult to achieve lasing. Finally, we describe a new class of driven-atom gain media that are ideally suited for constructing two-photon lasers.

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