Investigations of photophysical and generation properties of active elements based on dyes in aliphatic polyurethane matrix

A new polymer matrix based on aliphatic polyurethane was proposed and investigated for the development of laser active media for the tunable dye lasers. The polymer matrix was synthesized by the prepolymer method. The prepolymer, obtained from hexamethylene diisocyanate and oligodiethyleneglycol adipinate, was hardened by trimethylolpropane. The production method of the laser sandwich-like active media based on xanthene and pyrromethene dyes was described; their spectral, photophysical and generation characteristics were investigated. Significant increase in the beam strength of the polymer matrix, the growth in efficiency and stability of the active elements are observed due to the peculiarities of aliphatic polyurethane chemical structure. The main reason for the high photostability and operation lifetime of laser polyurethane-based active elements was shown to be the absence of reactive radicals.