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1 1999

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Infrared-to-visible upconversion in silica and fluorozirconate (ZBLAN) based erbium doped optical fibers. Er3 : ZBLAN optical fiber upconversion laser.

Kaczmarek F., Jendrzejczak A.

Optica Applicata

1999

Vol. 29, nr 3

371-381

Infrared-to visible upconversion has been observed by many authors in a variety of rare-earth doped crystals, glasses and optical fibers (see, e.g., review paper of JOUBERT [1]). We report on the studies of this process in erbium doped silica and fluoroziconate (ZBLAN) optical fibers. Fluorescence quenching in silica fibers appeared to be so strong that the efficiency for upconversion is very low. On the other hand, erbium doped fluorozirconate fiber exhibits extraordinary strong fluorescence in the 'green'. We report on a novel optical resonator configuration for an upconversion laser, pumped at 805 nm by a laser diode. The upconversion laser operated at 544 nm in a single mode. We came to the conclusion that the excited state absorption process is responsible for the upconversion observed.