D. J. Gauthier, Q. Wu, S. E. Morin, and T. W. Mossberg
Though the possibility of two-photon laser action was first discussed over 25 years ago, it has been realized only under a very limited set of circumstances and never, in the optical regime, under continuous-wave conditions. This is unfortunate, since the two-photon laser has been predicted to display a number of interesting properties such as bistable operation, unique threshold behavior, and, in some cases, squeezing.
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