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Proceedings Paper

Intrinsic optical bistability in Tm-doped laser crystal pumped at 648nm avalanche wavelength
Author(s): Li Li; Xinlu Zhang; Lixue Chen
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Paper Abstract

Intrinsic optical bistability and dynamic hysteresis phenomenon, induced by nonlinear excitation and energy level coupling, are predicted theoretically in single Tm-doped laser crystal pumped at 648nm avalanche wavelength. Taking into account the dominant energy transfer processes including excited state absorption, cross relaxation, energy transfer up-conversion and decay of the metastable level Tm3+ 3F4, the analytical formula of avalanche threshold condition are deduced in the steady-state approximation. Based on the theory of microscopic coupled rate equations, intrinsic optical bistability and influence of system parameters on hysteresis loop are studied numerically in detail by using a four-order Runge-Kutta technique. The numerical results predict that intrinsic optical bistability of near 2 micrometer fluorescence emission relevant to Tm 3F43H6 transition is achievable experimentally in single Tm-doped laser crystal. For realization of low threshold optical bistability and notable bistable hysteresis loop, it is beneficial to properly increase Tm3+-doped concentration and suppress energy transfer up-conversion. Furthermore, the interesting results obtained numerically show that laser-induced thermal effect is not the indispensable factor for occurrences of intrinsic optical bistability in rear-earth-doped crystal. Cooperation of nonliear excitation and energy level coupling can essentially lead to intrinsic optical bistability in rear-earth-doped system.

Paper Details

Date Published: 21 November 2007
PDF: 7 pages
Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67814Z (21 November 2007); doi: 10.1117/12.742447
Show Author Affiliations
Li Li, Harbin Engineering Univ. (China)
Harbin Institute of Technology (China)
Xinlu Zhang, Harbin Engineering Univ. (China)
Lixue Chen, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 6781:
Passive Components and Fiber-based Devices IV
Ming-Jun Li; Jianping Chen; Satoki Kawanishi; Ian H. White, Editor(s)

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