Large-signal theory of phase-conjugate backscatterings

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Abstract
The large-signal characteristics of conversion efficiency and gain saturation for phase-conjugate backscattering processes are discussed in detail to explain the large deviation of the simple small-signal theory from many experimental observations. As characterized by the nature of the inherent feedback in backward-traveling-wave interactions, complete power conversion from the pump to signal can often be accomplished. The understanding of this unique feature will provide new concepts for many high-power laser applications including, for example, power transmission to space vehicles and military applications concerning missiles.