节点文献
Tm掺杂激光晶体荧光双稳特性研究
Study on Fluorescence Bistability in Tm-doped Laser Crystals
【作者】 王冉；
【导师】 张新陆；
【作者基本信息】 哈尔滨工程大学 ， 光学， 2009， 硕士
【摘要】 研究基于稀土离子掺杂激光晶体的本征光学双稳态对实现全固态光开关和双稳波长切换等光学功能器件等方面具有重要的潜在应用价值。目前,探索和研究在新型稀土离子掺杂介质中产成光学双稳态的具体物理机理已经成为非线性光学领域的一个重要的研究方向。本论文利用速率方程理论,研究基于Tm3+离子掺杂激光晶体的本征光学双稳态,包括单掺Tm3+,Tm3+/Ho3+双掺和Tm3+/Yb3+双掺等掺杂体系。分别建立了系统的速率方程模型,数值分析单掺Tm3+本征光学双稳动力学,以及Tm3+/Ho3+双掺和Tm3+/Yb3+双掺激光晶体的本征光学双稳态。研究结果表明：对于单掺Tm激光晶体,可以观察到双稳现象,改变系统参数可以获得显著的本征光学双稳态,并预言了红外与可见蓝光的发光转换现象；对于Tm3+/Ho3+双掺激光晶体,在一定条件下也会存在双稳态行为；对于Tm3+/Yb3+双掺激光晶体,存在明显的光学双稳行为,改变系统参数可以有效地增强本征光学双稳效应。讨论了掺杂离子浓度的优化,晶体基质的选取,以及双稳迟滞回线的动态调控。
【Abstract】 Researches on intrinsic optical bistability based on rare-earth-ion-doped laser crystals are very interesting in various optical functional devices such as all-solid-state optical switch and bistable wavelength switching. Presently, the specific physical mechanism of optical bistability generating from the novel rare-earth ion-doped medium has become an important research direction in the nonlinear optics field.In the present paper, the intrinsic optical bistability based on Tm3+-doped laser crystals including Tm3+doped, Tm3+/Ho3+doped and Tm3+/Yb3+doped has been studied by utilizing the rate equation theory. The rate equation models have been built and the intrinsic optical bistability kinetics in Tm3+-doped, Tm3+/Ho3+ doped and Tm3+/Yb3+doped laser crystals have been analyzed numerically. The theoretical results indicates that for Tm3+doped laser crystal, the bistability can be observed, and the obvious intrinsic optical bistability can be obtained by changing system parameters, and luminescence switch phenomenon between infrared and blue fluorescences has been predicted. For Tm3+/Ho3+codoped laser crystal, the bistable behavior can also exist under certain conditions. While for Tm3+/Yb3+ codoped laser crystal, the optical bistable behavior is much stronger, and the intrinsic optical bistability can be enhanced by changing system parameters. In addition, the optimization of doped-ion concentration, selection of crystal mediums and dynamical control of bistable hysteresis loop are discussed in the paper.