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Photodegradation of near-infrared-pumped Tm3+-doped ZBLAN fiber upconversion lasers

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Abstract

Photodegradation has been observed in Tm3+-doped ZBLAN fiber lasers pumped with laser diodes at 1135 nm. After upconversion lasing at 482 nm, the fiber develops color centers that absorb strongly at wavelengths below ~650 nm, affecting further upconversion lasing. The rate of damage formation is strongly dependent on the pump power level and on the thulium concentration. The color centers are bleached by intense blue light but recover with thermal excitation and can be removed by thermal annealing at temperature near 100 °C.

© 1996 Optical Society of America

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