Amplification of counterpropagating waves in a nonlinearly absorbing cubic crystal

O. P. Zaskal'Ko, A. A. Zozulia, N. N. Panaioti +1 more

N. S. Vorob’ev, Anatoly B. Grudinin, E. M. Dianov +4 more

O. P. Varnavskiǐ, Valerie V. Golovlev, A. N. Kirkin +2 more

Aleksander Błȩdowski, Wieslaw Z. Krolikowski

The anisotropic four-wave mixing in the scheme recently proposed by S.I. Stepanov and M.P. Petrov (Opt. Commun. vol.53, p.64-8, 1985) is studied. The main feature of this interaction arrangement is that the same phase hologram (index grating) has opposite contrasts for orthogonally polarized, counterpropagating waves. The coupled nonlinear equations, in the case of transmission and reflection gratings, for the pi /2 photorefractive phase shift are exactly solved, and their properties are discussed in detail. The numerical evidence of the effects of bistability and self-oscillation is included.>

A. K. Popov, Vladimir M. Shalaev

Optical parametric amplification controlled by the auxiliary electromagnetic field enables transparency, amplification, and oscillation with no cavity in strongly absorbing negative-index metamaterials. The opposite directions of the wave vector and the Poynting vector in such materials result in extraordinary optical properties, including "backward" phase matching and the generation of entangled pairs of left- and right-handed counterpropagating photons.

Renato E. de Araújo, Alain Gomes