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Nonlinear Optics
Published in F.J. Duarte, Tunable Laser Optics, 2017
Optical phase conjugation is a technique that is applied to correct laser beam distortions, either intracavity or extracavity. A proof of the distortion correction properties of phase conjugation was provided by Yariv (1977) and is outlined here. Consider a propagating beam, in the +z direction, represented by E(r,t)=A1(r)e-i(ωt-kz)+...
Technology and applications of spatial light modulators
Published in John P. Dakin, Robert G. W. Brown, Handbook of Optoelectronics, 2017
Phase conjugation, whereby a phase-aberrated wave-front is “cleaned up”, is an attractive way of correcting phase aberrations of optical beams. There have been several attempts to use the PA LCLV technology, through its capability of real-time phase conjugation, to demonstrate such an action first by using nematic LCs [252,253] and later by using FLC modulators [254]. More recent use of SLM technology for real-time aberration correction appears in references [255,256].
A novel scheme of cascaded four-wave mixing for phase-sensitive amplification in nonlinear optical fibre
Published in Journal of Modern Optics, 2018
Abhishek Anchal, Pradeep Kumar Krishnamurthy, Pascal Landais
In this paper, we proposed and verified a novel scheme of phase-sensitive amplifier (PSA) using cascaded FWM in highly nonlinear fibre. The two phase-conjugate waves generated in first HNLF are used to pump FWM in second HNLF, which results in generation of frequency-shift-free optical phase conjugation. The signal and conjugate waves are combined to obtain constructive or destructive interference depending upon signal phase and hence the phase-sensitive amplification is obtained. Frequency-shift-free operation helps to amplify the signal without frequency conversion by PSA.