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Proceedings Paper

Upconversion processes, luminescence kinetics, and cw diode-pumped 2.8-um laser action in Er-doped double-fluoride crystals
Author(s): Alexandra M. Tkachuk; I. A. Mironov; V. M. Reiterov; Georgii E. Novikov; O. A. Orlov; Hans-Joachim Pohl; Rudolf W. Steiner; Martin Edelmann; V. P. Gapontsev
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Paper Abstract

We studied theoretically and experimentally the luminescence decay from excited erbium levels and laser action at 2.8 micrometers of lithium-yttrium double-fluoride LiYF4:Er3+ (YLF:Er3+) crystals. Experimental studies of the luminescence decay curves were carried out using selective laser excitation at 4I13/2 level by Q-switch pulsed Yb-Er glass laser ((lambda) pumpequals1.53micrometers ). The spectroscopic model was developed to simulate the population kinetics of excited Er levels, emitting in VIS and IR spectral regions including the 3micrometers laser transition levels in YLF:Er3+ crystals. The rate equations for the six lowest energy levels of YLF:Er3+ were numerically solved for short pulse excitation. It is shown the theoretical and experimental results are in good agreement. Single mode CW laser action at 2.8-micrometers was demonstrated in YLF:Er3+ and Ba Y2F8:Er3PLU crystals under LD pumping for the first time. Output power as high as 0.32 W and slope efficiencies about 20% were obtained with YLF:Er3+ (10%) laser rod in longitudinal pump scheme. No spike structure was observed in output beam. The dependence's of output power versus absorbed pump power were studied in laser rods with erbium concentrations10 at. % using LD pumping module (Model DL-5M) with fiber output.

Paper Details

Date Published: 23 March 2001
PDF: 9 pages
Proc. SPIE 4350, Laser Optics 2000: Solid State Lasers, (23 March 2001); doi: 10.1117/12.420948
Show Author Affiliations
Alexandra M. Tkachuk, S.I. Vavilov State Optical Institute (Russia)
I. A. Mironov, S.I. Vavilov State Optical Institute (Russia)
V. M. Reiterov, S.I. Vavilov State Optical Institute (Russia)
Georgii E. Novikov, Institute of Laser Physics (Russia)
O. A. Orlov, Institute of Laser Physics (Russia)
Hans-Joachim Pohl, Vitcon (Germany)
Rudolf W. Steiner, Univ. Ulm (Germany)
Martin Edelmann, Univ. Ulm (Germany)
V. P. Gapontsev, IPG Laser GmbH (Germany)

Published in SPIE Proceedings Vol. 4350:
Laser Optics 2000: Solid State Lasers
Vladimir I. Ustugov, Editor(s)

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