A A Borshch

Optical bistability and hysteresis in phase conjugation by degenerate six-photon mixing

Abstract First observation of non-cavity optical bistability and hysteresis in the phase conjugation by degenerate six-photon mixing in CdS crystals together with some analytical consideration is reported.

Phase conjugation by the degenerate six-photon mixing in semiconductors

Abstract The first observation is reported of phase conjugation (PC) with two times gain in six-photon mixing realized in a semi- conductor ZnSe crystal during two-photon absorption. Compensation of the influence of self-action effects on PC by the pump waves misalignment is demonstrated. A theory of six-photon mixing with illustration by scattering diagrams is developed.

Nonlinear refraction in nanocrystalline silicon carbide films

Nonlinear refraction in nanocrystalline SiC films, which have been obtained using the method of direct deposition of carbon and silicon ions with an energy of 100 eV at substrate temperatures from 900 to 1150°C, has been investigated. It has been shown that the films exhibit a large third-order nonlinear susceptibility χ(3) ∼ 10−6 esu (at λ = 1064 nm and τp = 10 ns).

Giant nonlinear refraction in Gold Island films

Giant nonlinear refraction has been experimentally observed in gold island films. The real part of the third-order nonlinear susceptibility χ(3)(ω: ω,-ω, ω) reaches a value of about 10−4 CGS units. The mechanism of nonlinearity of the refractive index can be associated with the resonance enhancement of the factor of the local optical field at the pump wavelength due to the excitation of surface plasmons, as well as with the contribution of the heating of conduction electrons in an ensemble of metal particles.