共查询到20条相似文献,搜索用时 78 毫秒
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描述了克尔介质自锁模激光器的锁模工作原理,建立了自锁模系统光强分辨率的概念,并指出了光强分辨率对自锁模系统的锁模启动和工作稳定性起着决定性的作用,通过合理控制克尔介质自锁模激光器的腔镜失谐角,可以提高系统的光强分辨率,从而使自锁模系统易于自锁模启动并提高其自锁模工作的稳定性。 相似文献
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分析了带非线性放大光纤环的全光纤激光器的自启动锁模特性,得到了计算该激光器中光脉冲的有效能量增益的理论模型.结果表明,激光器的自启动锁模同掺Er3+光纤的增益及纤芯的有效截面积有关,并计算了自启动锁模的阈值峰值功率大小.应用本文的理论模型能成功地解释观察到的实验现象. 相似文献
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构建了可自启动的双波长运转掺铒光纤锁模激光器.通过优化增益光纤长度,利用掺铒光纤在1530nm附近的再吸收效应调节激光器的增益谱,使激光器在1530nm和1560nm附近具有相同的增益强度.实验中采用31cm掺铒光纤作为增益光纤,以透射式半导体可饱和吸收体作为锁模器件,实现了自启动双波长锁模运转.激光器锁模输出重复频率为58.01MHz,信噪比为58.2dB,最高输出功率为4.8mW.锁模输出的光谱在1532.4nm和1552.3nm处具有两个强度接近的谱峰,谱峰间距约为20nm.该激光器无需手动调节即可实现双波长运转,更便于实际使用. 相似文献
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通过对非线性镜锁模激光器的稳态分析,找到了它的锁模条件及锁模脉冲的强度极限,为该激光器输出高功率的短脉冲提供了理论依据。 相似文献
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采用非线性薛定谔方程模拟了全正色散介质激光器中实现脉冲锁模输出的动态过程,理论表明,不同于工作于净色散为负的孤子锁模激光器以及腔内具有色散延迟线净色散为正的色散管理孤子和自相似脉冲锁模激光器,在纯正色散介质构成的锁模激光器中,增益饱和和增益窄化对形成稳定的锁模脉冲起重要的作用,在两者的作用下脉冲形成增益导引孤子.采用不同的锁模方式在纯正色散光纤锁模激光器中得到了稳定的增益导引孤子锁模,实验结果与理论模拟一致.
关键词:
锁模
正色散
增益导引孤子 相似文献
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用Z扫描方法研究了富勒烯有机铬衍生物fac- and mer- [bis (1,2-diphenylphosphino) ethane] (tricarbonyl) (η2-fullerene-C60) chromium的非线性折射特性;用速率方程理论分析了激发态光学非线性材料非线性折射行为,以及大光强下高阶激发态折射度如何引起材料自散焦-自聚焦相互转化.计算出了转变光强.并数值模拟了不同光强下Z扫描实验曲线的变化过程.理论计算与实验符合得较好.
关键词:
自散焦
自聚焦
富勒烯衍生物
Z扫描 相似文献
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Hengchang Ma Feng Wang Wenfeng Li Yuan Ma Xiaoqiang Yao Dedai Lu Yaoxia Yang Zhe Zhang Ziqiang Lei 《Journal of Physical Organic Chemistry》2014,27(9):722-728
Click chemistry is employed to couple two β‐cyclodextrins at both ends of azobenzene moiety yielding dumbbell‐shaped amphiphiles (AZO‐β‐CD dimer) constructed by rigid aromatic building blocks as “body”, and hydrophilic cyclodextrins as “head” with almost quantitative yield and purity. Bulk aggregates formed by the self‐assembly of the supraamphiphiles through π–π stacking and hydrophobic effect are observed. Meanwhile, the rationally designed polyesters, named as AZO‐PCL with controllable molecular weights and low polydispersities, are successfully synthesized by ring‐opening polymerization of ε‐caprolactone in the presence of p‐aminoazobenzene as initiator. In the aqueous phase, very stable spherical particles are formed by host–guest interactions between AZO‐β‐CD and AZO‐PCLs; the spherical aggregates inherit the photo‐responsiveness of azobenzene. The detailed aggregation and disaggregation behaviors are fully investigated by TEM, SEM, NMR, 2D NOESY, IR, UV and XRD measurements. Compared to the previous works, our newly developed system can be fabricated with more readily manners, avoiding tedious synthetic process; the reversible and dynamic nature of the non‐covalent interactions also can be modulated alternatively by UV or visible light. Thus, such dumbbell‐shaped supra‐amphiphiles are of great potential applications in the controlled delivery systems. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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The analysis of the EM radiation from a single charge shows that the radiated power depends on the retarded acceleration of
the charge. Therefore for consistency, an accelerated charge, free from the influence of external forces, should gradually
lose its acceleration, until its total energy is radiated. Calculations show that the self force of a charge, which compensates
for its radiation, is proportional to the derivative of the acceleration. However, when using this self force in the equation
of motion of the charge, one gets a diverging solution, for which the acceleration runs away to infinity. This means that
there is an inconsistency in the solution of the single charge problem. However, in the construction of the conserved Maxwell
charge density, there is implicitly an integral over the corresponding world line which corresponds to a collection of charged
spacetime events. One may therefore consistently think of the “self force” as the force on a charge due to another charge
at the retarded position. From this point of view, the energy is evidently conserved and the radiation process appears as
an absorbing resistance to the feeding source. The purpose of this work is to learn about the behavior of single charges from
the behavior of a real current, corresponding to the set of charges moving on a world line, and to study the analog of the
self force of a charge associated with the radiation resistance of a continuum of charges. 相似文献
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再谈"三维导体"的自感系数 总被引:4,自引:1,他引:3
由公式ε=L│dI/dt│出发,只要求出“三维导体”中的等效自感电动势,即可求得自感系数L,并以无限长同轴电缆自感系数的求解为例加以证明。 相似文献
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PropertiesofNd:YAGLaserwiththeNonlinearAbsorptionoftheIntracavityFullerenes¥LUOTing;YUZhenxin(StateKeyLabiratoryofUltrafastLa... 相似文献
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在理论上预言了一种新的参量空间光学双稳态,即以偏置电压为输入参量,Bi12SiO20晶体输出的高斯光束远场光斑中心点的光强为输出参量和输入高斯光束功率为常量的一种光学双稳态。并且在实验中分别实现了正偏置和反偏置两种情况下的偏置双稳态。 相似文献