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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Phase Conjugation By Brillouin Enhanced And Rayleigh Wing Induced Four Wave Mixing

A. M. Scott

Published Aug 23, 1983• 0 citations
Publisher

Abstract

It is shown that Brillouin enhanced 4 wave mixing can produce high reflection coefficients under certain conditions, and that this may be maximised by the presence of a non zero phase mismatch. However Rayleigh-Wing induced 4 wave mixing (which is associated with the optical Kerr effect) shows no such enhancement, and any phase mismatch only causes a further decrease in the reflectivity.

DOI
10.1117/12.934212

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Bandwidth effects on Brillouin enhanced four-wave mixing

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Annual Meeting Optical Society of America•Jan 1, 1992•0 citations
It is shown that Brillouin enhanced 4 wave mixing can produce high reflection coefficients under certain conditions, and that this may be maximised by the presence of a non zero phase mismatch. However Rayleigh-Wing induced 4 wave mixing (which is associated with the optical Kerr effect) shows no such enhancement, and any phase mismatch only causes a further decrease in the reflectivity.
It has previously been shown that Brillouin enhanced four-wave mixing can lead to large phase conjugate reflectivities for moderate laser powers.1,2 However, in the geometry considered by previous workers the pumps have equal frequency and hence the conjugate signal is shifted in frequency with respect to the probe. We have conducted an experimental and theoretical study of Brillouin-enhanced four-wave mixing for the different case in which the two pump waves differ in frequency by twice the Brillouin frequency of the four-wave mixing medium, and in which the probe wave frequency is halfway between those of the pump waves. In this case, the phase conjugate wave has the same frequency as the probe. Reflectivities > 100 % have been measured. Experimental results are compared to those of a theory that includes the effects of phase mismatch, pump depletion, and the finite response time of the medium.
Brillouin enhanced four-wave mixing (BEFWM) is a judicious combination of SBS and FWM processes. Very high phase conjugate reflectivity (>106) has been reported. Various conditions have been presented that lead to these high reflectivities, but all those discussions are based on a single mode laser. Here we report the experimental results of BEFWM with a multimode laser. The laser mode spacing is 0.15 GHz, which is larger than the linewidth of the acoustic phonon (0.1 GHz), so we can neglect the gratings that are not resonant with the acoustic frequency. We observed that the phase conjugate reflectivity is smaller for the multimode pump. Assume there is no coupling between modes through BEFWM and each mode interacts with the nonlinear medium independently. It has been shown that the reflectivity will decrease as the input pump power decreases. Thus the reflectivity of a single mode pump is higher than the resultant reflectivity from a multimode pump. Further examination of the temporal profiles of the probe and phase conjugate pulses in the multimode case shows that the pulse modulation depth is decreased in the phase conjugate pulse.