INVESTIGADORES
TORCHIA Gustavo Adrian
artículos
Título:
On the origin of the acoustic signals generated in KDP by pulsed UV laser excitation
Autor/es:
O. MARTINEZ-MATOS. G.A. TORCHIA, G.M. BILMES, J.O. TOCHO AND H. RANEA-SANDOVAL
Revista:
APPLIED PHYSICS B - LASERS AND OPTICS
Referencias:
Año: 2005 vol. 80 p. 535 - 539
ISSN:
0946-2171
Resumen:
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
UVradiation, 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, çF = 0.95 ± 0.05, and for the quantum
efficiency for bleaching of defects, çB = 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.çF = 0.95 ± 0.05, and for the quantum
efficiency for bleaching of defects, çB = 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.çB = 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.