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On the origin of the acoustic signals generated in KDP by pulsed UV laser excitation

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Martínez Matos, Óscar and Torchia, Gustavo Adrián and Bilmes, Gabriel M. and Tocho, Jorge Omar and Ranea Sandoval, Héctor Francisco (2005) On the origin of the acoustic signals generated in KDP by pulsed UV laser excitation. Applied Physics B-Lasers and Optics, 80 (04-05). pp. 535-539. ISSN 0946-2171

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Official URL: http://dx.doi.org/10.1007/s00340-005-1739-z


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Abstract

The origin of the acoustic signals that are generated in the bulk of a KDP crystal during irradiation with short UV laser pulses is determined. The generation of these signals by excitation with moderate or high optical fluences is linked to the evolution of the population of point defects that is generated in the crystal by absorption of two UV photons. These defects are bleached due to their efficient linear absorption of UV radiation, and their non-radiative relaxation is shown to be the origin of the acoustic signals. The rate constants for the different processes involved in both the linear and the non-linear interactions were determined from the experiments presented here. Characteristic values for the quantum efficiency for the generation of defects, η_F = 0.95 ± 0.05, and for the quantum efficiency for bleaching of defects, η_B = 0.065 ± 0.005, were obtained for 266-nm laser radiation. The model developed for the intensity of the acoustic signals reproduces the experimental facts with very good accuracy.


Item Type:Article
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© Springer-Verlag 2005.
Thisworkwas partially supported by FOMEC, CONICET, ANPCYT, UNCPBA, and UNLP. OEM is a Fellow of FOMEC; GMB is a member of the Carrera del Investigador Científico CIC-BA; JOT and HFRS are both members of the Carrera del Investigador Científico CONICET.

Uncontrolled Keywords:Potassium Dihydrogen Phosphate, Gamma-Irradiated Kh2po4, Optical-Absorption, Crystals, Luminescence, Nh4h2po4, Centers, ADP
Subjects:Sciences > Physics > Optics
ID Code:25242
Deposited On:09 May 2014 11:30
Last Modified:09 May 2014 11:30

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