Tm~(3+)/Yb~(3+)共掺激光晶体的本征光学双稳特性分析与参数优化
Characteristics of intrinsic optical bistability and parameter optimization in Tm~(3+)/Yb~(3+) codoped laser crystal
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摘要: 理论研究了650 nm激光雪崩抽运Tm~(3+)/Yb~(3+)共掺激光晶体的本征光学双稳态.基于系统的非线性耦合速率方程理论,数值分析了Tm~(3+)/Yb~(3+)离子能级布居数的本征光学双稳性、系统参数对光学双稳态的影响和双稳迟滞回线的动态变化.数值结果给出了光子雪崩机制下Tm~(3+)/Yb~(3+)共掺激光晶体的可见与红外光谱发光的本征光学双稳态;指出了通过优化Tm~(3+)/Yb~(3+)离子浓度比,选取低声子能晶体基质和采用晶体冷却技术,以及调谐抽运光与Tm~(3+)离子激发态跃迁能隙满足共振频率匹配,可以有效地增强本征光学双稳效应;通过微调谐抽运光波长和控制抽运光强变化速率,可以实现动态调控的本征光学双稳态.Abstract: Intrinsic optical bistability (IOB) in Tm~(3+)/Yb~(3+) codoped laser crystal under 650 nm laser excitation is theoretically studied.Based on the theory of nonlinear coupled rate equations, we numerically analyze IOB evolutions of the populations at Tm~(3+)/Yb~(3+) energy levels, and the influence of system parameters on IOB and the dynamic operation of bistable hysteresis loop.The simulation result shows the fluorescence IOB in visible-infrared spectra of Tm~(3+)/Yb~(3+) codoped laser crystal under photon avalanche pumping scheme.It is found that IOB phenomena can be largely enhanced by optimizing the Tm~(3+)/Yb~(3+) concentration ratio, choosing low phonon-energy crystal host and using crystal cooling technology, and also by tuning the pump laser to match the resonant frequency of Tm~(3+) excited-state absorption transition, Through tuning the pump laser wavelength and adjusting the rate of change in pump intensity, the controllable IOB switching can be achieved.
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