The time-resolved measurements of triplet and singlet luminescence from germanium oxygen-deficient centers (GODC’s) in germanosilicate fibers excited by short UV laser pulses are used to determine the cross section of UV absorption of GODC’s at λ = 248 nm (σ = 5 × 10-18 cm2), the oscillator strength of UV absorption (fabs = 0.027), and UV luminescence (flum = 0.031). The basis for these measurements is the direct luminescence detection of lifetimes of electronically excited states of GODC’s, the saturation of triplet luminescence signals, and the analysis of the rate equations that govern the laser photoexcitation and relaxation processes in GODC’s.
© 1995 Optical Society of America
V. N. Bagratashvili, V. K. Popov, S. I. Tsypina, P. V. Chernov, and A. O. Rybaltovskii, "Oscillator strengths of UV absorption and luminescence for oxygen-deficient centers in germanosilicate fibers," Opt. Lett. 20, 1619-1621 (1995)