Effective room-temperature luminescence in annealed chromium-doped silicate optical fibers

Abstract

The influence of annealing at 1000 °C on the absorption and luminescence spectra of chromium in aluminosilicate and gallium silicate fibers at temperatures of 77 and 300 K is investigated. The spectra of initially weak luminescence with a maximum at 1100 nm and a quantum yield of approximately ${10}^{-5}$ at 300 K shift to the 790–880-nm range in annealed fibers. After annealing the quantum yield increases by as much as 10%. The luminescence lifetime is found to be approximately 20 μs. The luminescence changes are explained by a rearrangement of the nearest environment and recharge of chromium ions $({\mathrm{Cr}}^{4+}$ to ${\mathrm{Cr}}^{3+}).$ The results obtained hold promise for the creation of tunable and ultrashort pulse fiber lasers.

© 2003 Optical Society of America

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