OSCILLATOR-STRENGTHS OF UV ABSORPTION AND LUMINESCENCE FOR OXYGEN-DEFICIENT CENTERS IN GERMANOSILICATE FIBERS

The time-resolved measurements of triplet and singlet luminescence fro m germanium oxygen-deficient centers (GODC's) in germanosilicate fiber s excited by short UV laser pulses are used to determine the cross sec tion of UV absorption of GODC's at lambda = 248 nm (sigma = 5 x 10(-18 ) cm(2)), the oscillator strength of UV absorption (f(abs) = 0.027), a nd UV luminescence (f(lum) = 0.031). The basis for these measurements is the direct luminescence detection of lifetimes of electronically ex cited states of GODC's, the saturation of triplet luminescence signals , and the analysis of the rate equations that govern the laser photoex citation and relaxation processes in GODC's. (C) 1995 Optical Society of America.