Yu. S. Zavorotny*, A. O. Rybaltovskii*, P. V. Chernov*, V. N. Bagratashvili**, V. K. Popov**,
S. I. Tsypina**, and L. Dong**
* Skobel’tsyn Research Institute of Nuclear Physics, Moscow State University, Vorob’evy gory, Moscow, 119899 Russia
** Research Center of Technological Lasers, Russian Academy of Sciences,
ul. Pionerskaya 2, Troitsk, Moscow oblast, 142092 Russia
Received June 4, 1997
Abstract—The effect of molecular hydrogen on the photoinduced decay of germanium oxygen-deficient cen-
ters in the germanosilicate glass network is studied in detail. The UV absorption, photoluminescence, and ESR
spectra are obtained for bulk glass samples and optical fibers with different concentrations of germanium and
hydrogen under high- and low-intensity excitations of a singlet–triplet system of germanium oxygen-deficient
center levels. The data obtained provide the basis for the model that reduces the role of hydrogen to passivating
the products of the germanium oxygen-deficient center decay during two-photon ionization upon high-intensity
irradiation. Upon low-intensity irradiation, the single-photon photochemical reactions occur between excited
germanium oxygen-deficient centers and hydrogen molecules.
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