Tailoring the Random Lasing Properties by Controlled Phase Separation Process in PMMA:PVK Dye-Doped Polymeric Blends

Abstract

This article describes the random lasing (RL) phenomenon obtained in a dye-doped, polymeric double-phase system composed of PMMA and PVK polymers. It shows how relative concentrations between mentioned macromolecules can influence lasing parameters of the resulting blends, including obtained emission spectra and threshold conditions. We describe the influence of lasers’ composition on their morphologies and link them with particular RL properties. Our studies reveal that the disorder caused by phase separation can support the RL phenomenon both in the waveguiding and quasi-waveguiding regimes. Changing the relative concentration of polymers enables one to switch between both regimes, which significantly influences threshold conditions, spectral shift, number of lasing modes, and ability to support extended and/or localized modes. Finally, we show that a simple phase separation technique can be used to fabricate efficient materials for RL. Moreover, it enables the tailoring of lasing properties of materials in a relatively wide range at the stage of the laser material fabrication process in a simple way. Therefore, this technique can be seen as a fast, cheap, and easy to perform way of random lasers fabrication.

Improvement in optical absorption and emission characteristics of polymethyl methacrylate in solution cast polymethyl methacrylate/polyvinyl carbazole polyblends

“…18 Cyprych et al studied the influence of rhodamine 6G dye doping on PMMA/PVK double phase system on the parameters of random lasing phenomena improvement to support the localised modes in this phase separated system fabricated by simple spin coating technique. 19 However, the literature reports are deficit of the detailed study of the optical and structural characteristics of the PMMA/PVK system. Therefore, the present work reports the role of PVK concentration in optically transparent PMMA polymer i.e.…”

“…18 Cyprych et al studied the influence of rhodamine 6G dye doping on PMMA/PVK double phase system on the parameters of random lasing phenomena improvement to support the localised modes in this phase separated system fabricated by simple spin coating technique. 19…”