https://doi.org/10.1140/epjd/e2003-00042-8
Photorefractive ac-enhanced nonlinear response of sillenites: Low- and high-contrast effects
1
Physics Department of the University, 49069
Osnabrück, Germany
2
International Institute for Nonlinear
Studies, Koptyg Ave 1, 630090, Novosibirsk, Russia
Corresponding author: a oleg.filippo@uni-osnabrueck.de
Received:
13
September
2002
Revised:
27
December
2002
Published online:
11
February
2003
Analytically and numerically we investigate the
dependence of the first Fourier harmonics of the space-charge
field, induced in an AC-biased sillenite crystal by a
light-interference pattern, on the light contrast m. It is shown
that within the whole contrast range, 0 < m < 1, these
dependences are controlled by the only scalar parameter – the
space-charge wave quality factor Q. In the low-contrast limit,
, this factor defines the degree of enhancement
of the nonlinear response while for larger contrasts it
characterizes strong saturation effects. The data obtained are
compared with the results of the previous studies of the
AC-response. The possibilities of experimental detection of
predicted dependences and their possible implications are
discussed.
PACS: 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation / 78.20.Bh – Theory, models, and numerical simulation
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
