Transient Phase Conjugation and Beam Combination by Degenerate Two Wave and Four Wave Mixing in Isotropic Media

A. Brignon, J.-P. Huignard

石垣 金, Hak Kyu Lee, 相洙 李

Michail G. Galushkin, Sergei A. Dimakov, R. N. Onoshko +2 more

K. S. Syed, Graham J. Crofts, R.P.M. Green +1 more

We study theoretically the properties of transient degenerate four-wave mixing in an isotropic, homogeneously saturable gain medium with interacting beams of arbitrary strength and polarization state. In particular we investigate the ability of the interaction to exhibit vectorial phase conjugation when orthogonally circularly polarized pump beams are used. This mechanism allows the correction of both phase and polarization distortions introduced to an optical beam. Numerical simulations are compared with experiments that use a flashlamp-pumped Nd3+:YAG amplifier and demonstrate good vector phase-conjugate fidelity for both weak and strong probe beams of arbitrary polarization state.

Henk F. Arnoldus, Thomas F. George

Santosh Kumar Saha

We derive expressions for the third-order nonlinearities responsible for the optical phase conjugation via backward degenerate four-wave mixing using various combinations of left and right circularly polarized beams in isotropic media. The effects of polarization conjugation and the nulling effect of phase conjugate waves are also discussed in an isotropic medium.