Abstract
Experimental and theoretical investigations of light self-trapping waveguides in a bulk polymeric medium based on polymethylmethacrylate (PMMA) with photosensitive phenanthrenequinone (PQ)-molecules are examined. Self-channeling was generated for the first time in this nonlinear bulk PQ-PMMA media with a thickness up to several millimeters and 0.1 mol. % PQ-concentration. The experimental formation of volume waveguide structures with a length of 2 - 3 cm at different laser wavelengths (405 nm, 488 nm, and 514.5 nm) was demonstrated. The calculations based on a model for the laser beam propagation in the bulk PQ-PMMA medium with competitive nonlinearities are in a good agreement with the experiments.
Highlights
The effects of the formation of localized spatial structures due to self-interaction of light beams in nonlinear optical media, especially nonlinear photopolymeric materials, have attracted widespread attention [1,2,3]
The calculations based on a model for the laser beam propagation in the bulk PQ-PMMA medium with competitive nonlinearities are in a good agreement with the experiments
In this work we have significantly increased the geometric dimensions of polymeric samples and used PQ-PMMA layers with a new preparation procedure
Summary
The effects of the formation of localized spatial structures due to self-interaction of light beams in nonlinear optical media, especially nonlinear photopolymeric materials, have attracted widespread attention [1,2,3]. To avoid the decrease of the refractive-index modulation caused by a lower dye concentration, one can use light sources with higher spectral frequencies, switching from green to blue excitation wavelengths (from 514.5 nm to 488 nm or even to 405 nm, which corresponds to the maximum of the PQ-absorption band). This allows to generate a change of the refractive index ∆n (up to 10−4) required for the nonlinear self-trapping formation through the bulk PQ-PMMA sample even at concentrations of PQ as low as 0.1 mol.%
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