Abstract

Ultraviolet upconversion signals at 293, 351, and 366  nm were observed from thulium-doped fluorozirconate fiber pumped with a 458-nm Ar+ laser. The upconversion signal’s intensity was enhanced 5× when the fiber was simultaneously pumped with a 458-nm Ar+ laser and a 585-nm dye laser. There is evidence of the formation of defect centers under simultaneous excitation by visible and near-infrared lasers (458 and 750  nm), and there is no evidence of color-center formation when both of the exciting beams are in the visible (458 and 585  nm).

© 2001 Optical Society of America

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