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Photothermal analysis of polymeric laser materials excited at different pump rates

AuthorsDuchowicz, Ricardo; Scaffardi, Lucía B.; Costela, A. ; Garcia-Moreno, I. ; Sastre Muñoz, Roberto ; Acuña, A. Ulises
KeywordsPhotothermal analysis
Polymeric dye laser materials
Issue Date2003
PublisherOptical Society of America
CitationApplied Optics, Vol. 42, Issue 6, pp. 1029-1035 (2003)
AbstractThe photothermal properties and heat diffusion of polymeric lasers, made up from solutions of Rhodamine 6G in solid matrices of poly(2-hydroxyethyl methacrylate) with different amounts of the cross-linking monomer ethylene glycol dimethacrylate and copolymers of 2-hydroxyethyl methacrylate and methyl methacrylate have been studied through photothermal deflection spectroscopy. The heat load that is due to the pumping process was quantified as a function of the pump excitation repetition frequency (0.25-10 Hz), determining the time-dependent temperature changes at different locations within the laser matrix. A theoretical model, which reproduces these changes with high accuracy, was developed on the basis of the heat-diffusion equation of optically dense fluids. The observed thermal effects became important for impairing the laser stability at pump repetition frequencies higher than 1 Hz. In addition, the irreversible optical changes produced in the laser matrices at high pump fluence values (>1 J/cm2) were also analyzed. These effects originate, most likely, from a two-step photothermal mechanism.
Publisher version (URL)http://dx.doi.org/10.1364/AO.42.001029
Appears in Collections:(IQFR) Artículos
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