Abstract
A split step whole beam method is used here to model photorefractive two-beam coupling. The technique is a more powerful alternative to the commonly used two-beam coupling model. The split step method is sufficiently general to allow the modeling of many phenomena such as beam funning, the fidelity of two-beam coupling image amplifiers, the fidelity of externally and self-pumped phase conjugators, effects of reduced spatial coherence in high gain beam1 coupling, and pulse length effects in photorefractive coupling of femtosecond pubes.2 In this paper we use the model for cw, mode-locked, and reduced spatial coherence coupling. The beams have arbitrary spatial profiles in the plane of interaction but are uniform perpendicular to the plane of interaction. The 2-D restriction is made so that the method could be tested using limited computing facilities. The procedure for two-beam coupling of continuous wave beams involves the following steps:
© 1992 Optical Society of America
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