Energy Transfer and Population of 4S3/2 and 4F9/2 Erbium Levels in Er3+:Na0.4Y0.6F2.2 Laser Crystals under Direct and Upconversion Selective IR Excitation

S. E. Ivanova; A. M. Tkachuk; M.-F. Joubert; Y. Guyot; V. P. Gapontsev

doi:10.1364/ASSP.2005.80

Advanced Solid-State Photonics (TOPS)
OSA Trends in Optics and Photonics (Optica Publishing Group, 2005),
paper 80
•https://doi.org/10.1364/ASSP.2005.80

Energy Transfer and Population of ⁴S_3/2 and ⁴F_9/2 Erbium Levels in Er³⁺:Na_0.4Y_0.6F_2.2 Laser Crystals under Direct and Upconversion Selective IR Excitation

S. E. Ivanova, A. M. Tkachuk, M.-F. Joubert, Y. Guyot, and V. P. Gapontsev

Advanced Solid-State Photonics 2005

Vienna Austria
6–9 February 2005
ISBN: 1-55752-792-X

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S. E. Ivanova, A. M. Tkachuk, M. -. Joubert, Y. Guyot, and V. P. Gapontsev, "Energy Transfer and Population of 4S3/2 and 4F9/2 Erbium Levels in Er3+:Na0.4Y0.6F2.2 Laser Crystals under Direct and Upconversion Selective IR Excitation," in Advanced Solid-State Photonics (TOPS), C. Denman and I. Sorokina, eds., Vol. 98 of OSA Trends in Optics and Photonics (Optica Publishing Group, 2005), paper 80.

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Abstract

Energy transfer processes in Er³⁺:Na_0.4Y_0.6F_2.2 laser crystals under selective laser diode pumping have been studied theoretically and experimentally. Concentration and pump power dependences of the intensity of luminescence from the ⁴S_3/2 and ⁴F_9/2 levels are investigated. It is shown, that under LD excitation at ⁴I_11/2 level (λ_exc= 975 nm) and certain conditions of pumping and erbium concentration the ⁴F_9/2 level is populated due to complicated excitation pathway including ESA from ⁴I_11/2 and ⁴I_13/2 levels and upconversion energy transfer steps, while relaxation from the ⁴S_3/2 level is ineffective for population of the ⁴F_9/2 level. The relative intensity of red (⁴F_9/2 level) and green (⁴S_3/2 level) luminescence can be controlled by means of excitation power, doping concentration and temperature.

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