https://doi.org/10.15407/spqeo5.03.268
Semiconductor Physics, Quantum
Electronics & Optoelectronics. 2002. V. 5, N 3. P. 268-283.
PACS: 42.70.N, 77.90.+k
Dynamics of photoinduced instability in ferroelectric photorefractive crystals caused by space recharging trap waves
Taras Shevchenko Kyiv University, Radiophysic
Department, 64 Volodymyrs'ka str., 01033 Kyiv, Ukraine.
E-mail: vvo@mail.univ.kiev.ua, morozo@iop.kiev.ua.
Abstract.
In the paper we theoretically consider the dynamics of the inner field
generated by recharging trap waves propagation and spatial-temporal features
of the photoinduced light scattering caused by these phenomena in the
ferroelectric photorefractive crystals with two donor levels under steady
illumination by laser beam. The transverse instability of the interacting
light beams plays an important role and both the photovoltaic current
from each donor level and the diffusion mechanisms of carrier transfer
are taken into account in the proposed theory. For the first time it has
been shown that, under the definite relation between the photoionization
velocities and anti-collinear Glass vectors of the donor levels, among
all possible scenarios of transverse instabilities the boundary circle
will be realized in the perfect crystal. Due to this phenomenon the periodical
photoinduced light scattering appears in the system. The great attention
has been paid to the generalization of the results in the form of master
equation for the inner field dynamics and to the description of the optical
autowaves generation in ilmenites. All the main theoretical results are
in a good agreement with the available experimental data.
Keywords: photorefractive
crystals, recharging waves, optical autowaves, master equation.
Paper received 08.04.02; accepted for publication
10.12.02.
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