Abstract

When an erbium-doped fluoride fiber was pumped with a red dye laser beam that resonantly excites the ${{}^{4}F}_{9/2}$ state, we detected efficient violet upconversion emission from the ${{}^{2}P}_{3/2}$ state that is much stronger than the green upconversion emission from the ${{}^{4}S}_{3/2}$ state. Such unusual violet emission was found to be due to a three-photon excitation process.

© 1997 Optical Society of America

Site-selective energy upconversion in CaF₂:Ho³⁺

S. Ray Bullock, B. R. Reddy, P. Venkateswarlu, and S. K. Nash-Stevenson
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High-power continuous-wave upconversion fiber laser at room temperature

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Green Er³⁺:YLiF₄ upconversion laser at 551 nm with Yb³⁺ codoping: a novel pumping scheme

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Low-noise operation of fluoride-based erbium-doped fiber amplifiers with ⁴I_11/2-level pumping

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Opt. Lett. 22(16) 1235-1237 (1997)