Abstract
Infrared to visible frequency up-conversion fluorescence spectroscopy in
erbium-doped chalcogenide glass samples excited at 1.06 and 1.54 mu m,
is experimentally investigated. For 1.06 mu m pumping, two-photon
absorption and phonon-assisted energy transfer account for the
excitation of the H-2(11/2), S-4(3/2) and F-4(9/2) emitting levels,
yielding intense green emission at 530 and 555 nm and low intensity
light at 670 nm, respectively. For excitation at 1.54 mu m, much higher
up-conversion efficiencies were obtained with the red emission signal
around 670 nm presenting higher intensity than the green fluorescence
signals. At this excitation wavelength the population of the H-2(11/2),
S-4(3/2) and F-4(9/2) excited-state emitting levels is accomplished via
energy-transfer and phonon-assisted decays. Saturation of the
up-conversion efficiency for 1.54 mu m pumping was also observed. (C)
1998 Elsevier Science B.V. All rights reserved.
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