Dielectric behaviour of composite solid state laser matrices containing perylene chromophores

Abstract

The dielectric relaxation spectra of dye containing silica gel-PMMA and bulk PMMA composites, recorded by means of the TSDC dielectric technique in the temperature range 10–320 K, have demonstrated a variety of overlapping thermally-induced current bands associated with different modes of dielectric relaxation, which are rather characteristic of the polymeric component. Molecular interactions between the inorganic (SiO₂) and polymeric (PMMA) phases have been shown to reflect in the activation energies of the polymer's β-relaxation mode. In the present study, the effect is unambiguously illustrated in the energy spectrum analysis of the partial discharge curves and the matermatical analysis based upon the varying heating rates procedure introduced by Solunov and Ponevsky.

Key Words:

• Organic—inorganic composites
• Solid-state dye lasers
• Dielectric relaxation