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Optics Letters

Threshold couplings of phase-conjugate mirrors with two interaction regions

Milivoj R. Belić, Milan S. Petrović, Oliver Sandfuchs, F. Kaiser

Published Mar 1, 1998• 5 citations
Publisher

Abstract

Using the grating-action method, we determine the threshold coupling strengths of three generic examples of phase-conjugate mirrors with two interaction regions: the cat conjugator, the mutually incoherent beam coupler, and the interconnected ring mirror.
DOI
10.1364/ol.23.000340

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We present theoretical and experimental studies of mutually pumped phase conjugation when a seed beam is injected that is the conjugate of one of the pumping beams. Good agreement exists between the theoretical and the experimental functional dependencies of the conjugate reflectivities on seed-beam intensity. However, the calculated gain is lower than that measured by two-beam coupling by nearly a factor of 2. We found that the seed-to-pump intensity ratio needs to exceed approximately 10−6, greater than 100 times the scattering, before the phase of the grating in the mutually pumped phase conjugator will follow the phase of the seed beam when it is varied by a moving mirror.