Abstract

We have studied phase pulling and phase locking of an injected Stokes pulse in a transient Raman amplifier both theoretically and experimentally. Our experimental results show that the phase of the injected Stokes pulse is pulled into synchronism with the pump phase (apart from a constant offset) when either the Raman amplification is low (of the order of 1–10) or the process is driven into saturation. However, when the amplification is moderate to high (10³ or greater in our experiments) but the pump is not depleted, no evidence of phase pulling is observed. Under certain conditions a rapid phase change of π is observed near the beginning of the Stokes pulse. The observations of phase pulling at low gain and under saturated conditions are in agreement with the simple plane-wave transient theories of stimulated Raman scattering. The rapid π phase changes can also be explained within the context of these theories in terms of absorption of the injected Stokes pulse, followed by growth of a Stokes pulse with the opposite sign. The failure to observe phase pulling under conditions of high, unsaturated gain is not currently explained by the simple theories and may be an indication of more complicated processes.

© 1990 Optical Society of America

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