NON-LINEAR OPTICAL ENVIRONMENT Russian patent published in 2005 - IPC

FIELD: the invention refers to optics.

SUBSTANCE: it may be used for protection of photo receiving devices from laser blinding by radiation of excessive intensity and at creation of non-linear optical limiters of radiation designed for protection of eyesight apparatus from damaging by laser radiation, for making low-threshold of optical switches. The purpose of the invention is in decreasing of energy threshold of the beginnings of non-linear -optical response of the environment. The non-linear -optical environment contains inorganic crystalline nanoparticles placed in transparent environment with linear optical characteristics. The nanoparticles consist of a nucleus not holding a shell having absorbing centers for example admixtures or defects. The shell and the nanoparticles are made of the same material. At impacting of laser radiation on non-linear-optical environment, photo generation of non-equilibrium electrons begins in the shell of the nanoparticle having defects out of an impurity zone into a conducting band. The changing of concentration of carriers lead to appearance of non-linear addition to the refraction index and absorbing of the shell. At photo generation of carriers a gradient of their concentration originates between the shell and the nucleus and as a result their diffusion begins deep into the nucleus. At that the thickness of the layer containing non-linear addition to the refraction index and absorption grows. As a result dielectric permittivity of a nanoparticle changes and that leads to changing of the section of its absorption and dispersion.

EFFECT: non-linear optical effect becomes apparent in limiting radiation.

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