增益饱和在啁啾脉冲放大中的影响

研究了增益饱和在啁啾脉冲放大中的影响，发现由于增益饱和在存在，压缩后脉冲的信噪比会下降，而且展宽器附加的色散也会降低输出的信噪比，这种降低对应着一定的光谱畸变。通过对展宽／压缩器作用的分析，提示了啁啾脉冲放大中光谱与光强的内在联系，提出利用非共振放大来修正光谱畸变提高放大压缩后的信噪比。     

二极管激光侧面泵浦腔内倍频Nd：YAG板条激光器研究

用准连续６０Ｗ的二极管激光列阵侧面泵浦“之”字形Ｎｄ：ＹＡＧ板条激光器，当泵浦功率为４５Ｗ，脉宽为４００μｓ时，得到３．５ｍＪ的激光输出。用ＫＤ＊Ｐ电光开关调Ｑ，得到１８ｎｓ（ＦＷＨＭ）、２ｍＪ的脉冲激光输出，用ＫＴＰ晶体作腔内倍频，得到１５ｎｓ、０．８５ｍＪ的二次谐波激光输出。在腔内无调Ｑ元件且腔长小于５ｃｍ时，于近阈值处得到单频绿光输出，而当泵浦功率稍大，腔内有数个纵模振荡时，观察到激光的反相态，并用数值模拟的结果对此作了解释。     

Projective synchronization of hyperchaotic system via periodically intermittent control

We further study the projective synchronization of a new hyperchaotic system. Different from the most existing methods, intermittent control is applied to chaotic synchronization in the present paper. We formulate the intermittent control system that governs the dynamics of the projective synchronization error, then derive the sufficient conditions for the exponential stability of intermittent control system by using Lyapunov stability theory, and finally establish the periodically intermittent controller according to the stability criterion by which the projective synchronization is expected to be achieved. The analytical results are also demonstrated by several numerical simulations.     

啁啾脉冲放大中的脉宽限制

给出脉冲展宽／压缩比与线性啁啾量之间的关系式，然后通过对放大过程中脉冲宽度和啁啾量变化情况的分析，得到了啁啾脉冲放大后最窄脉冲宽度的解析表达式，与实际报道的实验的比较表明该理论是简明而极其有效的。     

Impulsive control for synchronization of nonlinear Rossler chaotic systems

This paper reports that an impulsive control theory for synchronization of nonlinear R?ssler chaotic systems is developed. A new framework for impulsive synchronization between such chaotic systems is presented, which makes the synchronization error system a linear impulsive control system. Therefore, it is easy to derive the impulsive synchronization law. The proposed impulsive control scheme is illustrated by nonlinear R?ssler chaotic systems and the simulation results demonstrate the effectiveness of the method.     

输出2TW/45fs的掺钛蓝宝石超短脉冲强激光系统

建立了一套基于啁啾脉冲放大技术,输出峰值功率达到2.8TW的掺钛蓝宝石激光系统。压缩脉冲的中心波长为785nm,能量为120mJ,脉冲宽度43.3fs,能量稳定性±5%,输出的光束质量M~2<1.5,脉冲重复频率10Hz,运转稳定可靠。整套激光系统实现了小型化,占用的光学平台不足10m²。     

Projective synchronization of a hyperchaotic system via periodically intermittent control

We further study the projective synchronization of a new hyperchaotic system. Different from the most existing methods, intermittent control is applied to chaotic synchronization in the present paper. We formulate the intermittent control system that governs the dynamics of the projective synchronization error, then derive the sufficient conditions for the exponential stability of intermittent control system by using the Lyapunov stability theory, and finally establish the periodically intermittent controller according to the stability criterion by which the projective synchronization is expected to be achieved. The analytical results are also demonstrated by several numerical simulations.     

激光二极管泵浦的全固体锁模激光器

报道了用国产激光二极管泵浦Ｎｄ：ＹＶＯ４激光器连续锁模的实验结果。在泵浦功率为１２２．４ｍＷ时获得稳定的锁模序列，脉冲宽度４３ｐｓ（ＦＷＨＭ），输出功率７ｍＷ，实验中在较低的泵浦强度下观察到了弛豫振荡的振幅调制现象，并导出了含有自相位调制时锁模宽度的自恰解。     

二介质激光放大器工作特性的数值模拟

从简明的物理模型出发，首次从理论上模拟了二介质激光放大器的工作特性，表明它能够同时满足输出高能量，超短脉冲放大的要求。对实验中可能遇到的问题进行了模拟，并提出了解决的方法。     

旁轴近似描述的耦合系统模式耦合效率研究

从泵浦光与腔模的空间匹配函数出发，讨论了泵浦光的发散角、焦点位置等因素对激光系统效率的影响。发现在旁轴近似下，匹配函数的最大值随泉浦光发散角的增大而增大，在考虑到像散的影响后，得到泵浦光发散角的参考值。