Nearly-Resonant Gain Grating in Atomic Media

R. Soulard, A. Brignon, Jean‐Pierre Huignard +1 more

Non-degenerate two-wave mixing in inverted laser materials is investigated both theoretically and experimentally. A complete model of two-wave mixing in gain media in the presence of an athermal refractive index grating is presented and application to beam-combining is investigated in pumped Nd3+ and Yb3+ laser materials. Experimental results are presented for a Nd:yttrium aluminum garnet crystal fiber.

Pedro Sancho

A. P. Chu, Kent S. Johnson, Mara Goff Prentiss

Nikolai V. Kukhtarev, T. I. Semenets

It is shown that detuning from resonance in resonant media may cause wavefront reversal (WFR) accompanied by rotation. This effect is due to parametric diffraction from phase gratings of the population difference. In resonance, WFR may be found without phase distortions as a result of diffraction from gain gratings in the inverted medium. An analysis is made of the initial stage of the WFR kinetics and the possibility of observing inhomogeneities in WFR is studied.

Anatoli V. Andreev

Abstract : The mathematical algorithms and programs for the study of the resonant light-matter interactions in the multi-component and multilevel media and photonic bandgap structures have been developed. The optimal component distribution in the two-component media have been found to get a pulse of a superradiative emission of the highest intensity. The mathematical algorithms and programs for the study of the femtosecond pulse propagation in an extended medium of the two-level atoms have developed. The regime of the inversionless superradiance in the two-component superradiative medium has been investigated. The theory of the superradiance by an ensemble of the two-level atoms embedded in the dielectric host was developed. It was shown that the near dipole-dipole interaction of dense collection of two-level atoms is enhanced by the presence of the host material, decreasing the pulse temporal width and increasing the peak pulse intensity of superradiative emission. The theory of nonlinear light-matter interaction in multidimensional resonant photonic crystals under Bragg diffraction condition has been developed. It was obtained the analytical and numerical solutions describing the novel kinds of nonlinear solitary waves: the Laue soliton, O-field, propagating and standing gap solitary waves. It has been described the spatio-temporal nonlinear dynamics of coherent field in periodic resonant structures with arbitrary modulation of atomic density and gain gratings.

Nicholas Proite, Daniel Sikes, Deniz D. Yavuz