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Title

Photophysical characterization of pyrromethene 597 laser dye in cross-linked silicon-containing organic copolymers

AuthorsTyagi, A.; Agua, D. del ; Penzkofer, A.; García Ballesteros, Olga; Sastre, Roberto; Costela, A. ; Garcia-Moreno, I.
KeywordsPyrromethene dye PM597
Solid-state laser dye characterization
Polymer matrices
Ground-state absorption cross-sections
Stimulated emission cross-sections
Excited-state absorption cross-sections
Fluorescence quantum distributions
Fluorescence quantum yields
Fluorescence lifetimes
Degrees of photo-degradation
Optical dye concentration determination
Issue Date2007
PublisherElsevier
CitationChemical Physics 342 : 201–214 (2007)
AbstractSamples of the dipyrromethene–BF2 dye PM597 incorporated in copolymers of 3-trimethoxysilylpropyl 2-methylprop-2-enoate (TMSPMA, number of polymerizable CC double bonds: j = 1) with 2-(2-methylprop-2-enoyloxy)ethyl 2-methylprop-2-enoate (EGDMA, j = 2), [2-(hydroxymethyl)-3-prop-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate (PETA, j = 3), and [3-prop-2-enoyloxy- 2,2-bis(prop-2-2-enoyloxymethyl)propyl]prop-2-enoate (PETRA, j = 4) are characterized. The fluorescence quantum distributions, fluorescence quantum yields, degrees of fluorescence polarization, and fluorescence lifetimes are measured. The radiative lifetimes are calculated from fluorescence lifetime and quantum yield. Absorption coefficient spectra are determined from transmission measurements. Absolute absorption cross-section spectra and dye concentrations are obtained by calibration to the radiative lifetimes and to saturable absorptions. Excited-state absorption cross-sections at 527 nm are determined by saturable absorption measurements. The photo-degradation is studied under cw laser excitation conditions and quantum yields of photo-degradation are extracted. The excited-state absorption cross-sections were found to be rather small, and the photo-stability turned out to be high (up to 3 million excitation cycles before degradation) making this class of dipyrromethene dye-doped polymers attractive active laser media. Structural and thermomechanical properties of the materials have been determined by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetry, densitometry, and refractometry. They improve with increasing inter-crossing (copolymerization of TMSPMA with PETA and PETRA). The laser properties of the PM597 doped copolymers were evaluated by transverse pumping with 6 ns laser pulses at 532 nm. The best laser materials resulted to be the 7:3 and 9:1 TMSPMA-monomer copolymers. 2007 Elsevier B.V. All rights reserved.
Publisher version (URL)http://dx.doi.org/10.1016/j.chemphys.2007.10.002
URIhttp://hdl.handle.net/10261/51914
DOI10.1016/j.chemphys.2007.10.002
ISSN0301-0104
Appears in Collections:(IQFR) Artículos
(ICTP) Artículos
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