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Title: | Photothermal analysis of polymeric laser materials excited at different pump rates |
Authors: | Duchowicz, Ricardo; Scaffardi, Lucía B.; Costela, A. CSIC ORCID; Garcia-Moreno, I. CSIC ORCID; Sastre Muñoz, Roberto CSIC; Acuña, A. Ulises CSIC | Keywords: | Photothermal analysis Polymeric dye laser materials |
Issue Date: | 2003 | Publisher: | Optical Society of America | Citation: | Applied Optics, Vol. 42, Issue 6, pp. 1029-1035 (2003) | Abstract: | The 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 http://www.opticsinfobase.org/viewmedia.cfm?uri=ao-42-6-1029&seq=0 |
URI: | 10261/11758 | DOI: | 10.1364/AO.42.001029 | ISSN: | 0003-6935 |
Appears in Collections: | (IQFR) Artículos |
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