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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 6 — Feb. 20, 2003
  • pp: 1029–1035

Photothermal analysis of polymeric dye laser materials excited at different pump rates

Ricardo Duchowicz, Lucía B. Scaffardi, Angel Costela, Inmaculada García-Moreno, Roberto Sastre, and Alberto Ulises Acuña  »View Author Affiliations


Applied Optics, Vol. 42, Issue 6, pp. 1029-1035 (2003)
http://dx.doi.org/10.1364/AO.42.001029


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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.

© 2003 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.2050) Lasers and laser optics : Dye lasers
(160.3380) Materials : Laser materials
(160.5470) Materials : Polymers
(300.6430) Spectroscopy : Spectroscopy, photothermal
(350.5340) Other areas of optics : Photothermal effects

History
Original Manuscript: May 15, 2002
Revised Manuscript: October 9, 2002
Published: February 20, 2003

Citation
Ricardo Duchowicz, Lucía B. Scaffardi, Angel Costela, Inmaculada García-Moreno, Roberto Sastre, and Alberto Ulises Acuña, "Photothermal analysis of polymeric dye laser materials excited at different pump rates," Appl. Opt. 42, 1029-1035 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-6-1029

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