Study of dynamical effects using phase conjugation of light waves

Reddy Kothakapu Nireekshan, Venu Achanta Gopal, Subhasish Dutta Gupta

Coherent perfect absorption has been one of the important research directions in optics in recent years because of its ability to absorb all the incident light. It has been extended to nonlinear regime to show multistability and gap solitons in nonlinear periodic structures. We study yet another nonlinear effect, namely, phase conjugation in a Kerr nonlinear composite slab when the counter propagating pump waves are completely absorbed by means of coherent perfect absorption. The theory is developed under the undepleted pump approximation, when the pump waves can be decoupled from the signal and the phase conjugated waves. Dynamical phase matching is also incorporated. The coupling constant and the phase conjugated reflectivity are shown to undergo a substantial increase. They also exhibit multivalued response. Both downward and upward switching are shown to be possible. The effect can be used for efficient switching of the phase conjugated reflectivity in photonic circuits and can find several application in photonic logic gates.

Nikolai F. Pilipetsky, V. I. Popovichev, V. V. Ragulsky

Tsutomu Hoshimiya, Naohiro Tanno

N. F. Andreev, V. I. Bespalov, M. A. Dvoretskii +1 more

The method of the four-wave phase conjugation of weak light signals with a large coefficient of transformation of the pump wave energy into the conjugated wave is studied.

Boris Ya Zel'dovich, N. F. Pilipetskiǐ, Vladimir V. Shkunov

Hong-Chang Kung, Hon Fai Yau, Hsiao Yi Lee +5 more

We have demonstrated experimentally the simultaneous self-conjugation of extraordinarily and ordinarily polarized light waves (lambda=514 nm), with the polarization state preserved, in a Ce:BaTiO(3) crystal. Conjugate o waves originate from coupling between o and e waves by means of a circular photogalvanic effect. The conjugator also takes advantage of the Ce:BaTiO(3) crystal, for which it is easy to generate an extraordinary conjugate beam by photorefractive backscattering. This beam of light is necessary for double phase conjugation.