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Infrared second-order nonlinear optical effect in Sb2Te3-SrBr2-PbCl2 glass

Gruhn W.

Optica Applicata

2005

Vol. 35, nr 3

329-336

A phenomenological and microscopic theory of IR picosecond nonlinear optical response in glass is developed for the middle IR spectral range (5-15 um). Both IR-induced second harmonic generation (SHG) as welt as linear electrooptic effect (LEOE) were observed. The observed effects are explained within a framework of fifth-order nonlinear optical susceptibilities. A model that reproduces the basic features of the experimental data, in which are discovered the optical nonlinearities caused by photoinduced electron-phonon anharmonic interactions, is proposed. The role of the IR induced phase matching conditions in the observed phenomena is discussed.