Interaction of laser radiation with matter. Laser plasma

UV laser-induced current in germanosilicate fibres with built in electrodes

A. O. Rybaltovskii^a, V. N. Bagratashvili^b, P. V. Chernov^a, P. G. Kazanskii^c, V. Pruneri^c, S. I. Tsypina^b, Yu. S. Zavorotnyi<sup>a

a</sup> Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University
^b Institute of Laser and Information Technologies, Russian Academy of Sciences, Troitsk, Moscow Region
^c Optoelectronics Research Centre, University of Southampton, UK

Abstract: The nature of photocurrents is studied in germanosilicate single-mode fibres with built in electrodes. It is shown that irradiation by excimer KrF laser pulses at electric field strengths up to 1.6 MV cm^-1 causes a charge formation and transfer in the core of the fibre and the injection of photoelectrons from metal electrodes to the fibre cladding. Both effects facilitate the flow of electric current through the sample. The dependences of the photocurrent on the electric field strength, the energy density in the laser pulse, the fibre temperature, and the impurity hydrogen in the fibre core are obtained.

PACS: 42.81.Cn, 72.20.Ht, 72.40.+w

Received: 11.09.2000

 English version: Quantum Electronics, 2001, 31:3, 236–240

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