Non-coherent stimulation of all-optically created nonlinear polarizability in glass

Abstract

In presented investigation the non-coherent stimulation of all-optically created nonlinear polarizability in glass are considered. It is demonstrated that the nonlinear polarizability in the synthesized phosphate glass in form of all-optically induced periodic second-order susceptibility pattern with very small amplitude, which were preliminarily written by using the bi-frequency powerful laser light, can be increased up to some orders of magnitude under the action of non-coherent monochromatic radiation from the side of the sample. The optical increase of the small susceptibility pattern takes place independent of the polarization and direction of propagation of the optical amplifying radiation. The observed phenomenon is not be explained only by nonlinear wave’s interaction in glass and also may be related to the microscopic asymmetry processes of the optical transitions between active centers in band gap of the amorphous medium that leads to the appearance and growth of the small periodical electrical charges separations all-optically induced inside the sample. The possible processes which may be responsible for the observed effects in studied phosphate glass are discussed. The investigations are interesting due to the possibility in future for the creating of new photo-electronic elements on the base of all-optically created nonlinear polarizability in glasses, potentially perspective for laser physics and, in particular, also for bio-photonics. The work was created as part of Russian State Task FWGW-2025-0019.

Speaker

Liubov I. Vostrikova
Rzhanov Institute of Semiconductor Physics SB RAS, IT department of NSUEM
Russia

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