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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 17, Iss. 12 — Dec. 1, 2000
  • pp: 2055–2067

Laser-relevant spectroscopy and upconversion mechanisms of Er3+ in Ba2YCl7 pumped at 800 nm

R. Burlot-Loison, M. Pollnau, K. Krämer, P. Egger, J. Hulliger, and H. U. Güdel  »View Author Affiliations


JOSA B, Vol. 17, Issue 12, pp. 2055-2067 (2000)
http://dx.doi.org/10.1364/JOSAB.17.002055


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Abstract

We present a comprehensive spectroscopic study of the possible room-temperature green laser transition  2H9/2 4I13/2 in Ba2YCl7:3%Er3+. Because of the low phonon energies, 270 cm-1 in Ba2YCl7, the otherwise multiphonon-quenched  4I9/2 and  2H9/2 levels are metastable and can serve as intermediate pump and upper laser levels, respectively, for a green upconversion laser excited at 800 nm. Polarized spectra of ground-state and excited-state absorption at 800 nm and of emission at 560 nm are measured, and the corresponding absorption and emission cross sections are derived. Luminescence-decay measurements provide lifetime data. Despite the large number of metastable levels of Er3+ in a low-phonon host material, luminescence spectra and intensity-versus-power measurements reveal that the energy dissipation into levels other than those required for the operation of the laser transition (i.e.,  4I15/2 4I9/2 2H9/2 4I13/2) is small at low dopant concentrations. At higher concentrations, an energy-transfer upconversion process populates the lower laser level and counteracts inversion. The theoretical pump threshold of the proposed upconversion-laser transition under cw and pulsed excitation is derived.

© 2000 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(160.5690) Materials : Rare-earth-doped materials
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6360) Spectroscopy : Spectroscopy, laser

Citation
R. Burlot-Loison, M. Pollnau, K. Krämer, P. Egger, J. Hulliger, and H. U. Güdel, "Laser-relevant spectroscopy and upconversion mechanisms of Er3+ in Ba2YCl7 pumped at 800 nm," J. Opt. Soc. Am. B 17, 2055-2067 (2000)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-17-12-2055


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