噪声之间的耦合对一维激光场的影响

本文从理论上对加性噪声和倍增噪声之间有耦合作用的一维激光模型进行了分析，求出定态时激光强度分布函数的解析形式．同噪声之间不存在耦合的激光模型相比较，噪声之间的耦合增强了激光强度的涨落．     

非线性激光场中量子噪声之间的耦合效应

用二维气体激光模型对量子噪声的实部和虚部存在耦合的激光场进行了理论分析，通过福克－普朗克方程导出了定态激光光场强度和位相的分布函数，算出了定态激光强度和位相的平均值，方差和偏斜度，与量子噪声的两个分量为独立随机变量的激光场相比，噪声间的耦合极大地改变了激光场强度和位相的涨落，并引起了激光场强度与位相之间的耦合。     

倍增噪声和饱和效应对环形激光场动力学性质的影响

用一椎近似的方法求得了同时存在倍增噪声和饱和效应的双向环形激光场含时几率密度函数,讨论了倍增噪声和饱和效应对表征激光场动力学性质的两个重要物理量－－光场强度相关时间和有效本征值的影响。     

加性噪声对激光一级相变类比的影响

从单模激光场的增益－噪声模型出发,导出了激光场定态强度分布函数,研究了定态分布函数的极值点随加性噪声、乘性噪声和注入信号的变化情况。结果表明,乘性噪声是使激光系统出现一级相变类比的关键因素,注入信号使相变行为减弱,而加性噪声却使得定态分布中极值点的数量和位置出现来回跳跃式变化。     

饱和效应对激光场强度相关时间和有效本征值的影响

用全饱和激光模型对既含有加性又含有倍增噪声的激光场进行理论分析，求出了强度相关时间Ｔｃ的数值解和有效本征值λｅｆｆ的解析解。与实验测量相比较表明，全饱和激光模型与实验吻合得最好，而三次激光模型的偏差较大。     

噪声对双模激光竞争效应的影响

讨论了噪声对双模激光模间竞争效应的影响。通过线性稳定性分析，得到一些有意义的结论。     

空间电荷场对自由电子激光中电子稳态轨道的影响

本文从三维模型出发,详细地研究了自由电子激光中电子束空间电荷场对相对论性电子稳态轨道的影响,发现考虑空间电荷场的三维效应后,电子稳态轨道出现新的不稳定性区域。 关键词：     

正负迁移对学生解决问题能力的影响举隅

迁移是学习过程中普遍存在的一种现象,与提高学生解决问题能力密切相关.如何在高中物理教学中发挥正迁移的积极作用,同时抓住负迁移带来的教学契机,进行深层次的剖析.本文结合教学实践做出一些探讨.     

L-C耦合电路对散粒噪声探测器电子学噪声的影响

通过分析基于L-C耦合跨阻运放电路的散粒噪声探测器噪声来源,提出了电感的寄生电容对电子学噪声影响的分析模型,并进行了实验验证.研究表明,电感的寄生电容会增大跨阻运放的输入电压噪声增益,从而增加探测器的电子学噪声.当总电感值为1mH时,选用两个0.5mH的电感串联结构相比选用单个1mH的电感,探测器电子学噪声明显降低.由于电感的自共振频率越低,寄生电容越大,选用高自共振频率的电感有助于进一步降低电子学噪声.实验测量得到,在2.5 MHz分析频率处,选用两个0.5mH、自共振频率为6 MHz的电感串联相比选用单个1mH、自共振频率为1.6 MHz的电感,电子学噪声的降低了3dB.在相同入射激光条件下,该改进模型可以有效提高探测器的信噪比.     

靶结构对激光等离子体动量耦合系数的影响

强激光与靶相互作用产生的等离子体可以作为一种新型的推进源.就强激光与靶相互作用过程中，靶结构对激光等离子体动量耦合系数的影响进行了研究.结果表明，相对于无约束的平面靶，坑靶将动量耦合系数提高了5倍，而约束的平面靶将动量耦合系数提高了10倍以上.分析发现，对等离子体的有效约束是提高动量耦合系数的主要原因. 关键词： 激光等离子体 推进 动量耦合系数     

Saturation Effects in Mode-competition Effects of a Two-mode Laser with Multiplicative Noise

The full saturation effects in mode-competition effect of a two-mode laser with multiplicative noise are studied. By comparing a gain-noise model with a loss-noise model, it is found that the saturation term really has a great effect on mode-competition effects.     

Saturation Effects in Mode competition Effects of a Two mode Laser with Multiplicative Noise

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｗｏｍｏｄｅｌａｓｅｒｓ（ＴＭＬ）ｈａｖｅｂｅｎｔｈｅｓｕｂｊｅｃｔｏｆｅｘｔｅｎｓｉｖｅｉｎｔｅｒｅｓｔｉｎｒｅｃｅｎｔｙｅａｒｓ．Ｍｏｄｅｃｏｍｐｏｔｉｔｉｏｎｅｆｅｃｔｉｓｏｎｅｏｆｔｈｅｉｍｐｏｒｔａｎｔｐｒｏ...     

Colored Noise in First-order-like Phase Transition of a Laser System

The decoupling theory is employed to analyze the multiplicative colored noise in a single mode laser system. Steady state intensity distribution function is derived when colored noise is included in the laser system. The first-order-like phase transition driven by multiplicative colored noise is investigated and compared with the case of multiplicative white noise. It is shown that the noise correlation time can affect the parameter plane of the first-order-like phase transition. The steady state intensity distributions in a laser system is changed greatly with noise correlation time τ.     

负关联噪声驱动下单模激光的定态分析

研究了负关联的加法和乘法高斯白噪声驱动下单模激光损失模型的定态情况。文中推导了负关联情况下，定态时的激光场幅的几率分布，光强的平均值，光强的协方差以及光强的偏斜率。并和文献〔１，２〕中正关联时的定态分析作了比较，发现了有意义的新现象。     

Mode competition Effects of a Two Mode Laser with Multiplicative Colored Noise

１ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｄｅｃｏｍｐｅｔｉｔｉｏｎｅｆｅｃｔｓａｒｅｏｎｅｏｆｔｈｅｉｍｐｏｒｔａｎｔｐｒｏｂｌｅｍｏｆｔｗｏｍｏｄｅｌａｓｅｒ（ＴＭＬ）．Ｉｎ１９６０ｓ,ｔｈｅｉｎｖｅｓｔｉｇａｔｉｏｎｓｏｆｍｏｄｅｃｏｍｐｅｔｉｔｉｏ...     

Colored Noise in First-order-like Phase Transition of a Laser System

The decoupling theory is employed to analyze the multiplicative colored noise in a single mode laser system. Steady state intensity distribution function is derived when colored noise is included in the laser system. The first-order-like phase transition driven by multiplicative colored noise is investigated and compared with the case of multiplicative white noise. It is shown that the noise correlation time can affect the parameter plane of the first-order-like phase transition. The steady state intensity distributions in a laser system is changed greatly with noise correlation time τ.     

Cooperative Effects of Noise and Coupling on Stochastic Dynamics of a Membrane-Bulk Coupling Model

Based on a membrane-bulk coupling cell model proposed by Gomez-Marin et al. [ Phys. Rev. Lett. 98 （2007） 168303], the cooperative effects of noise and coupling on the stochastic dynamical behavior are investigated. For parameters in a certain region, the oscillation can be induced by the cooperative effect of noise and coupling. Whether considering the coupling or not, corresponding coherence resonance phenomena are observed. Furthermore, the effects of two coupling parameters, cell size L and coupling intensity k, on the noise-induced oscillation of membranes are studied. Contrary effects of noise are found in and out of the deterministic oscillatory regions.