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Highly nonlinear near-resonant photodarkening in a thulium-doped aluminosilicate glass fiber

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Abstract

Permanent photoinduced optical attenuation has been observed in Tm3+-doped aluminosilicate glass fibers on exposure to near-resonance mode-locked 1064-nm radiation at 300 K. The rate of this darkening was observed to follow a 4.7 ± 0.4 power dependence on the 1064-nm intensity. The result shows that absorption of infrared light of moderate intensity can lead to photoionization in rare-earth-doped glass, provided that a multiphoton stepwise excitation channel exists.

© 1993 Optical Society of America

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