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Proceedings Paper

Population kinetics of the fluorescing MNa center state in CaF2 upon fs laser excitation at 392 nm and 262 nm
Author(s): C. Karras; C. Mühlig; W. Paa; H. Stafast; W. Triebel; T. Zeuner
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Paper Abstract

We report on femtosecond (fs) laser experiments yielding the time constants τrel for the non-radiative relaxation from optically excited high energy MNa** states to the fluorescent MNa* state in CaF2 samples. The values obtained with the third and second harmonics of the fs laser amount to τrel (262 nm) = (3.0 ± 0.3) ps and to τrel (392 nm) = (1.0 ± 0.1) ps for the two selected MNa** states at 4.7 eV (262 nm) and 3.2 eV (392 nm) excitation energy, respectively. These time constants were derived from depletion processes of the fluorescence at 740 nm (MNa* state) using fs laser pulses of the NIR fundamental wavelength (785 nm) at variable delay relative to the UV fs laser pulses. In addition, photobleaching of the MNa centers upon UV fs laser irradiation is observed and simulated by assuming a constant fraction of MNa bleaching per pulse for a given laser fluence. This fraction ranges from 0.14% per pulse at 392 nm and 0.28mJ/cm2 to about 1% per pulse at about 6 mJ/cm2.

Paper Details

Date Published: 29 November 2010
PDF: 8 pages
Proc. SPIE 7842, Laser-Induced Damage in Optical Materials: 2010, 78421R (29 November 2010); doi: 10.1117/12.867256
Show Author Affiliations
C. Karras, IPHT Jena (Germany)
C. Mühlig, IPHT Jena (Germany)
W. Paa, IPHT Jena (Germany)
H. Stafast, IPHT Jena (Germany)
Friedrich-Schiller-Univ. (Germany)
W. Triebel, IPHT Jena (Germany)
T. Zeuner, IPHT Jena (Germany)

Published in SPIE Proceedings Vol. 7842:
Laser-Induced Damage in Optical Materials: 2010
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; M. J. Soileau, Editor(s)

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