Abstract
Two-photon absorption (TPA) coefficients of hydrogen-loaded germanosilicate fiber are measured in the range of 440–500 nm with a tunable dye laser pumped by a frequency-tripled Q-switched YAG laser. The fiber is standard telecommunication fiber loaded with 100-atm hydrogen. The measured TPA coefficients had a maximum value of 3×10 −4 cm/MW at 480 nm. The wavelength of 480 nm corresponds to twice the absorption wavelength of germanium-related oxygen-deficient centers (GODCs). The maximum TPA coefficient was two times that of non-loaded fibers. The mechanism of the increase by hydrogen loading is discussed with two different models, which involve parity change in electronic states of a GODC induced by a hydrogen molecule and absorption by combination of a hydrogen molecule and a GODC in the excited triplet state.
Published Version
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