Upconversion processes, luminescence kinetics, and cw diode-pumped 2.8-um laser action in Er-doped double-fluoride crystals

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

doi:10.1117/12.420948

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23 March 2001 Upconversion processes, luminescence kinetics, and cw diode-pumped 2.8-μm laser action in Er-doped double-fluoride crystals

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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Proceedings Volume 4350, Laser Optics 2000: Solid State Lasers; (2001) https://doi.org/10.1117/12.420948
Event: Laser Optics 2000, 2000, St. Petersburg, Russian Federation

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 ⁴I_13/2 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:Er^3PLU 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.

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Alexandra M. Tkachuk, I. A. Mironov, V. M. Reiterov, Georgii E. Novikov, O. A. Orlov, Hans-Joachim Pohl, Rudolf W. Steiner, Martin Edelmann, and V. P. Gapontsev "Upconversion processes, luminescence kinetics, and cw diode-pumped 2.8-μm laser action in Er-doped double-fluoride crystals", Proc. SPIE 4350, Laser Optics 2000: Solid State Lasers, (23 March 2001); https://doi.org/10.1117/12.420948

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