Population of excited erbium levels in Er3+:Na0.4Y0.6F2.2 (Er:NYF) laser crystals

[摘要] We have studied theoretically and experimentally the population dynamics of six radiative erbium levels in concentration series of Er3+:NYF crystals. The radiative transition probabilities were calculated by the Judd-Ofelt method; the nonradiative transition probabilities were estimated; energy transfer (ET) microparameters (for migration, selfquenching (SQ), and upconversion (UC) processes) in studied crystals were estimated theoretically using the method of quantum-mechanical model calculation. The rate equations for the six lowest energy levels of erbium in Er3+:NYF crystals, including the 3 mum laser transition levels, were numerically solved for the case of excitation by nanosecond pulse at lambda(pump) = 1.53 mum. The theoretical and experimental results for Er3+:NYF crystals are in good agreement. Single mode CW laser action was achieved in Er:NYF crystal at 2.8 mum with InGaAs LD pumping of the I-4(11/2) level. Output power about 72 mW with slope efficiency similar to4% was achieved in longitudinal pump scheme. (C) 2004 Elsevier B.V. All rights reserved.

[发布日期] 2004-10-20

[效力级别]  Proceedings Paper

[关键词] time-resolved optical spectroscopies;luminescence;nonlinear optics