Table of Contents
Laser Chemistry
Volume 12, Issue 3-4, Pages 211-222
http://dx.doi.org/10.1155/LC.12.211

UV Laser Decay of Oxygen-Deficient Centers in Silica Glasses

1Science-Research Center for Technological Lasers of Rus. Ac. Sci., Moscow Region, Troitsk 142092, Russia
2Institute of General Physics of Rus. Ac. Sci., ul. Vavilova 38, Moscow 117924, Russia
3Institute of Nuclear Physics of Moscow State University, Leninskie Gory, V-234, Moscow 119899, Russia

Copyright © 1992 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Oxygen-deficient centers decay with simultaneous formation of color centers in IR and UV grade silica glasses under KrF laser irradiation was studied. The nonexponential dependence of the ODC photodecay in silica glass on the UV irradiation dose (number of laser pulses) was observed. Postpulse long-time temporal behaviour of recombination luminescence and laser induced photoconductivity was analyzed for the two types of glasses in time scale up to 0.5 ms. Long time fluorescence tail is attributed to migration of electrons through the shallow traps before recombination and recovery of ODC. The models of postpulse recombination which can explain the observed nonexponential behaviour of ODC decay (geminal and homogeneous) are discussed. The principle part of impurities caused electron traps in the postpulse ODC recombination is shown.