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Journal of Luminescence

Pump-probe measurement of the avalanche up-conversion gain in Tm3+ : YLF

Veronique François, F. Pellé, Philippe Goldner, David J. Simkin

Published Jul 1, 1995• 13 citations
Publisher
DOI
10.1016/0022-2313(95)00059-y

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Analysis of intrinsic optical bistability in Tm: YSGG laser crystal pumped under avalanche excitation at around 1um

WU Li-hua, Yu Chung Huang

Intrinsic optical bistability (IOB) in Tm: YSGG (yttrium-scandium-gallium garnet) laser crystal pumped at 1um avalanche wavelength is predicted theoretically and studied numerically. The nonlinear rate equations of Tm: YSGG are given based on the nonlinear energy transfer processes. From the rate equations, the analytical formula of avalanche threshold condition is deduced in the steady-state approximation. Both the intrinsic bistability effect of population concentrations at Tm3+ levels versus pumping power and the influence of system parameters on IOB avalanche threshold are studied numerically. The results show that the avalanche threshold power of IOB can be changed by adjusting experimentally adjustable parameters such as the Tm3+ −dope concentration.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 4, 2013•0 citations
New efficient mechanisms of long-wavelength excitation of short-wavelength luminescence in a system of rare-earth impurity ions are proposed. The model studied involves a multilevel system of electronic states of a rare-earth ion interacting with the long-wavelength emission that is in resonance with one or several transitions between the excited levels. The concentration of impurity ions is assumed to be sufficiently high, so that the interionic cross-relaxation and the up-conversion play a significant role. Moreover, the model includes processes similar to photon avalanche, in which the photoinduced excitation of a single ion is converted into lower-level excitations of several ions, each of them reentering the process after photon absorption. Numerical solutions of the system of balance equations for a multilevel system are obtained with calculated and semiempirical parameters of self-quenching and up-conversion. It is shown that, in a system of Tm 3+ impurity ions, short-wavelength luminescence at λ≥0.29 μm can be efficiently excited by radiation at λ≅1.11 or 0.649 μm with a moderate intensity.
Intrinsic optical bistability (IOB) in Tm: YSGG (yttrium-scandium-gallium garnet) laser crystal pumped at 1um avalanche wavelength is predicted theoretically and studied numerically. The nonlinear rate equations of Tm: YSGG are given based on the nonlinear energy transfer processes. From the rate equations, the analytical formula of avalanche threshold condition is deduced in the steady-state approximation. Both the intrinsic bistability effect of population concentrations at Tm3+ levels versus pumping power and the influence of system parameters on IOB avalanche threshold are studied numerically. The results show that the avalanche threshold power of IOB can be changed by adjusting experimentally adjustable parameters such as the Tm3+ −dope concentration.