A. I. Gracheva, R. V. Romashkob, c, *, Yu. N. Kulchinb, c, S. S. Golikc,
E. Nippolainend, and A. A. Kamshilind
a Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia
b Optoelectronics Department, Institute of Automation & Control Processes, FEB RAS, Vladivostok, 690041 Russia
c School of Natural Sciences, Far Eastern Federal University, Vladivostok, 690950 Russia
d Department of Applied Physics, University of Eastern Finland, P. O. Box 162 7, FIN- 70211 Kuopio, Finland
*e-mail: romashko@iacp.dvo.ru, rorovl@mail.ru
Received December 11, 2011; published online May 11, 2012
Abstract—We demonstrate excitation of the linear photogalvanic current in a Bi12TiO20 crystal by two orthog-
onally polarized femtosecond laser pulses with detecting the electrical current via charge accumulation on the
sample electrodes. Such a setup was used to implement an interferometric autocorrelation technique for char-
acterization of ultrashort light pulses. Integration of the detected current in femtosecond time domain leads to
vanishing of a bipolar component of the photogalvanic current which arises due to a pulse chirping. The advan-
tage of the proposed technique is that it produces the electric field correlation function directly without the need
for data processing using a compact, robust, and non-expensive detector in the form of a photoconductive cell
of a non-centrosymmetric crystal.
DOI: 10.1134/S1054660X12060047
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