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摘要: 理论研究了650 nm激光雪崩抽运Tm3+/Yb3+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Tm3+/Yb3+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Tm3+/Yb3+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Tm3+/Yb3+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Tm3+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 Tm3+/Yb3+ 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 Tm3+/Yb3+ 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 Tm3+/Yb3+ codoped laser crystal under photon avalanche pumping scheme. It is found that IOB phenomena can be largely enhanced by optimizing the Tm3+/Yb3+ 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 Tm3+ 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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