Er:YAG 4 I 11/2 - 4 I 13/2 激光跃迁的动力学过程研究

Yoshinobu Maeda

Optical signal inverter and memory were demonstrated through a purely optical approach in a simple structure composed of a laser diode and an Er-doped YAG crystal.The intensity of an output laser transmitted through the Er:YAG was suddenly decreased by increasing the injection current to put the oscillation wavelength of the laser close to the central absorption peak of the Er:YAG at 787.6nm.In addition, the transmission of the Er:YAG versus injection current characteristics showed hysteresis and optical bistability.These effects were caused by the red shift and the hysteresis of the wavelength of the laser diode against the injection current.With the use of these effects, the optical signal inverter and memory were realized at a response time of 100ps.

于亚勤, 李玫, 张思远

B. I. Galagan, Boris I. Denker, Vyacheslav V Osiko +1 more

It is shown that, as the temperature of an Yb, Er:YAG crystal is increased from room temperature to 400–600°C, the efficiency of energy accumulation on the 4 I 13/2 level of the Er 3+ ion increases by several times upon optical pumping through Yb 3+ ions. Under these conditions, up to 60% of erbium ions can be excited, which gives promise that lasing at a wavelength of 1.54 μm can be achieved in the Yb, Er:YAG crystal in the three-level scheme.

Mali Gong, 翟刚, 时顺森 +6 more

测量了Ｃｒ＾４＋：ＹＡＧ材料的可饱和吸收特性，用多种数据分析方法处理了实验结果，Ｃｒ＾４＋：ＹＡＧ的基态吸收截面σｇｓ＝１１×１０＾－１９ｃｍ＾２，激光发态吸收截面σｇｓ＝１．２×１０＾－１９ｃｍ＾２。

李晓奇, 王金伟

本文研究掺Er3＋光纤系统中的光学双稳和多稳,定性分析了双稳态的形成机理.通过理论衍生公式对系统特性进行拟合,在改变相干场的拉比频率和耦合方式的情况下,对系统的双稳与多稳能进行有效的控制.

Seyyed Hossein Asadpour, HAMID RAHIMPOUR SOLEIMANI

We study the absorption-dispersion process and group index of weak probe field in a four-level Er 3+ :YAG crystal. We find that the Er 3+ ion concentration and incoherent pumping field can influence the absorption-dispersion process and group index of weak probe field. Moreover, our results show that Er 3+ ion concentration plays a major role in lasing without inversion and absorption with inversion.