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利用修饰态的选择性捕获产生最大原子相干
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作者 胡响明 徐至展 《量子光学学报》 CSCD 2002年第B09期32-33,共2页
关键词 修饰态 选择性捕获 量子原子相干 三能级系统 激发 强自发辐射
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修饰态布居的选择性激发对无反转激光的作用 被引量:12
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作者 王振华 胡响明 《物理学报》 SCIE EI CAS CSCD 北大核心 2004年第8期2569-2575,共7页
以三能级V型系统为例研究修饰态布居的选择性激发对无反转激光增益的作用 .当非相干驱动场的频谱宽度远小于驱动场产生的修饰态能级的间距时 ,非相干驱动场只将一个修饰态的布居抽运至激发态 .借助原子的衰减通道 ,系统中形成单向布居... 以三能级V型系统为例研究修饰态布居的选择性激发对无反转激光增益的作用 .当非相干驱动场的频谱宽度远小于驱动场产生的修饰态能级的间距时 ,非相干驱动场只将一个修饰态的布居抽运至激发态 .借助原子的衰减通道 ,系统中形成单向布居转移通道 ,从而建立修饰态布居的选择性激发 .利用修饰态布居的选择性激发 ,可以摆脱裸态共振无反转激光的三个限制 :(1 )不再要求辅助的低频驱动跃迁比高频激光跃迁具有更高的衰减速率 ;(2 )显著降低非相干激发速率的阈值 ;(3)无反转激光的线性增益不再反比于相干驱动场的强度 。 展开更多
关键词 修饰态布居 选择性激发 无反转激光增益 原子衰减速率 非相干激发阈值速率 量子干涉效应 激光物理
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利用修饰态电磁感应透明产生光放大和噪声抑制
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作者 李景艳 《光学学报》 EI CAS CSCD 北大核心 2015年第A02期222-227,共6页
提出了利用原子在修饰态下处于电磁感应透明(EIT)构型来产生光放大和量子噪声压缩。主要利用修饰态原子和组合模的方法讨论一个四能级Tripod原子系统。在双光子共振的条件下,两个强的相干场耦合原子产生两个叠加态,其中的一个叠加... 提出了利用原子在修饰态下处于电磁感应透明(EIT)构型来产生光放大和量子噪声压缩。主要利用修饰态原子和组合模的方法讨论一个四能级Tripod原子系统。在双光子共振的条件下,两个强的相干场耦合原子产生两个叠加态,其中的一个叠加态与系统退耦合,这将导致两个腔场间产生量子拍。该四能级系统在修饰态下简化成了一个标准的三能级EIT模型,在这个EIT系统中,激光跃迁、原子相干耦合和自发衰减通道形成了一个连续的布居转移通道,激光电子有规律地循环。该机制提供了一种产生具有高强度振荡的压缩激光方式。 展开更多
关键词 量子光学 压缩 激光振荡 修饰态电磁感应透明 组合模
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密度相关的多光子Jaynes-Cummings模型的修饰SU(2)相干态及其量子特性 被引量:2
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作者 穆轶 侯邦品 余万伦 《四川师范大学学报(自然科学版)》 CAS CSCD 2004年第2期189-192,共4页
基于密度相关的多光子Jaynes Cummings模型的群结构,定义了该模型的修饰SU(2)相干态,并研究了以修饰SU(2)相干态作为初态的系统的原子和光场的压缩效应,光子的反聚束效应等.
关键词 密度相关的多光子Jaynes-Cummings模型 修饰SU(2)相干 压缩效应 反聚束效应
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具有四个简并基态原子的人造规范势
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作者 袁通全 《河池学院学报》 2016年第5期59-63,共5页
研究激光场作用下的具有四个简并基态和一个激发态原子的行为。在简并基态和激发态构成的基矢下,对基态和激发态间的耦合作用量对角化。结果表明,由于暗态依赖于坐标,包含矢量势和标量势的人造势场出现在暗态构成的亚空间中。特别是,证... 研究激光场作用下的具有四个简并基态和一个激发态原子的行为。在简并基态和激发态构成的基矢下,对基态和激发态间的耦合作用量对角化。结果表明,由于暗态依赖于坐标,包含矢量势和标量势的人造势场出现在暗态构成的亚空间中。特别是,证明了利用具有角动量的正交激光束,可以获得一个有效的具有类磁单极的磁场。 展开更多
关键词 规范势 非阿贝尔规范势 修饰态
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腔场耦合的二能级原子荧光谱 被引量:1
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作者 张雪华 戚辉 +2 位作者 李林 葛向红 李梦 《原子与分子物理学报》 CAS 北大核心 2018年第3期473-476,共4页
通过光与物质相互作用的主方程计算了强场激励的二能级原子与单模腔耦合的稳态荧光谱.在腔场的强耦合作用下,三峰Mollow谱的每个成分都分裂为多重的,这种现象由腔场使原子修饰态能级漂移而导致的,荧光谱的具体结构则依赖于驱动场的拉比... 通过光与物质相互作用的主方程计算了强场激励的二能级原子与单模腔耦合的稳态荧光谱.在腔场的强耦合作用下,三峰Mollow谱的每个成分都分裂为多重的,这种现象由腔场使原子修饰态能级漂移而导致的,荧光谱的具体结构则依赖于驱动场的拉比频率和原子-腔的耦合系数. 展开更多
关键词 共振荧光 耦合系数 修饰态
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电磁诱导透明 被引量:2
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作者 王丽 宋海珍 《南阳师范学院学报》 CAS 2006年第6期31-33,共3页
阐述在三能级原子系统中产生的电磁诱导透明现象,在强耦合场作用下,耦合跃迁产生一对修饰态跃迁,把探测场跃迁一分为二,分裂后的两个探测跃迁由修饰态相干对吸收引起相消干涉,从而抑制吸收,使介质在强相干场作用下呈现完全透明现象.
关键词 电磁诱导透明 修饰态 相消干涉
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激光对双原子分子自发辐射的影响
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作者 伏云昌 周凌云 陈学俊 《原子与分子物理学报》 CAS CSCD 北大核心 1994年第4期399-404,共6页
在偶极近似下,研究了激光场中双原子分子的修饰态(dressedstate),讨论了修饰态之间的自发辐射;与没有激光时相应过程比较,结果表明激光影响下荧光呈多重结构。
关键词 激光 修饰态 自发辐射 双原子扫除
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激光影响下的荧光过程
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作者 伏云昌 周凌云 陈学俊 《昆明工学院学报》 1993年第1期72-77,共6页
在偶极近似下,讨论了多原子分子在激光影响下的荧光过程.首先用微扰论处理激光场修饰后的多原子分子态,然后研究了修饰态(Dressed state)自发跃迁产生的荧光,并与没有激光时的相应过程进行了比较.结果表明,激光影响下荧光呈多重结构.
关键词 激光 修饰态 荧光过程 多原子分子
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光学总论 量子光学
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《中国光学》 CAS 2005年第3期1-2,共2页
O431.2 2005031601 压缩态光场变耦合系数双光子J-C模型性质=Time-de- pendent atom-field coupling J-C model with an initial squeezing state:two-photon process[刊,中]/许静平(同济 大学物理系,上海(200092)),羊亚平…∥光学学... O431.2 2005031601 压缩态光场变耦合系数双光子J-C模型性质=Time-de- pendent atom-field coupling J-C model with an initial squeezing state:two-photon process[刊,中]/许静平(同济 大学物理系,上海(200092)),羊亚平…∥光学学报.- 2005,25(2).-251-255 讨论了初始光场为压缩态、原子-光场耦合系数随时 间变化情形下双光子过程J-C模型的量子统计性质。 展开更多
关键词 腔场谱 物理学报 大学物理 相干 压缩效应 原子系统 电磁感应透明 真空场 级联三能级原子 修饰态
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Effect of transient current bonding on interfacial reaction in Ag-coated graphene Sn-Ag-Cu composite solder joints 被引量:6
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作者 Yong-dian HAN Jia-hang YANG +2 位作者 Lian-yong XU Hong-yang JING Lei ZHAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第8期2454-2467,共14页
To address the problem of floating and aggregation of Ag-GNSs in the molten pool during the traditional reflow soldering process,Cu/SAC/Ag-GNSs/Cu sandwich joints were prepared under an applied current density(1.0... To address the problem of floating and aggregation of Ag-GNSs in the molten pool during the traditional reflow soldering process,Cu/SAC/Ag-GNSs/Cu sandwich joints were prepared under an applied current density(1.0×10^(4) A/cm^(2))for a few hundred milliseconds to produce Ag-coated graphene-reinforced Sn-Ag-Cu(SAC/AgGNSs)solder joints.The experimental results showed that Ag-GNSs were homogenously dispersed in the solder joints,providing more Cu6 Sn5 grain nucleation sites,which refined these grains and reduced the thickness difference at the anode and cathode.In addition,the Cu6 Sn5 morphology changed from rod-like to plate-shaped because of the uniform distribution of Ag-GNSs and constitutional supercooling.The significantly increased shear strength of the transient current bonding and the change in the fracture mechanism were due to the uniformly distributed Ag-GNSs and the microstructural changes. 展开更多
关键词 transient current bonding Ag-GNS Cu6Sn5 shear strength
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Intermedin/adrenomedullin2: an autocrine/paracrine factor in vascular homeostasis and disease 被引量:14
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作者 NI XianQiang ZHANG JinSheng +1 位作者 TANG ChaoShu QI YongFen 《Science China(Life Sciences)》 SCIE CAS 2014年第8期781-789,共9页
Intermedin(IMD)or adrenomedullin 2 is a novel peptide related to the calcitonin gene-related peptide(CGRP)family.Via calcitonin receptor-like receptor/receptor activity modifying proteins,the common receptor complexes... Intermedin(IMD)or adrenomedullin 2 is a novel peptide related to the calcitonin gene-related peptide(CGRP)family.Via calcitonin receptor-like receptor/receptor activity modifying proteins,the common receptor complexes of CGRP,IMD exerts a wide range of biological effects,especially regulation of cardiovascular homeostasis.Proteolytic processing of a larger IMD precursor yields a series of biologically active C-terminal fragments,IMD1–53,IMD1–47 and IMD8–47.IMD and its receptors are present in the cardiovascular system,and IMD is present at low levels in plasma.In the cardiovascular system,IMD has multiple functions such as regulation of blood pressure and cardiac function,pro-angiogenesis,endothelial barrier function protection,anti-oxidative stress,and anti-endoplasmic reticulum stress.IMD participates widely in the pathogenesis of atherosclerosis,hypertension,pulmonary arterial hypertension and vascular calcification.It is a vascular regulatory factor of homeostasis and a vital endogenous protective factor against vascular diseases. 展开更多
关键词 INTERMEDIN VESSEL HOMEOSTASIS vascular diseases
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Honeycomb silicon: a review of silicene 被引量:2
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作者 Jincheng Zhuang Xun Xu +3 位作者 Haifeng Feng Zhi Li Xiaolin Wang Yi Du 《Science Bulletin》 SCIE EI CAS CSCD 2015年第18期1551-1562,共12页
Silicene, a new allotrope of silicon in a twodimensional honeycomb structure, has attracted intensive research interest due to its novel physical and chemical properties. Unlike carbon atoms in graphene, silicon atoms... Silicene, a new allotrope of silicon in a twodimensional honeycomb structure, has attracted intensive research interest due to its novel physical and chemical properties. Unlike carbon atoms in graphene, silicon atoms prefer to adopt sp2/sp3-hybridized state in silicene,enhancing chemical activity on the surface and allowing tunable electronic states by chemical functionalization. The silicene monolayers epitaxially grown on Ag(111) surfaces demonstrate various reconstructions with different electronic structures. In this article, the structure, phonon modes, electronic properties, and chemical properties of silicene are reviewed based on theoretical and experimental works in recent years. 展开更多
关键词 SILICENE Electronic states Chemicalfunctionalization
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Nanopore-based sensing and analysis: beyond the resistive-pulse method
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作者 蒋亚楠 郭维 《Science Bulletin》 SCIE EI CAS CSCD 2015年第5期491-502,共12页
Solid-state nanopores are generally considered as an indispensable element in the research field of fundamental ion transport and molecular sensing. The im- provement in fabrication and chemical modification of the so... Solid-state nanopores are generally considered as an indispensable element in the research field of fundamental ion transport and molecular sensing. The im- provement in fabrication and chemical modification of the solid-state nanopores remains increasingly updated. During the last decades, numerous works have been reported on the nanopore-based sensing applications. More and more new analytical methods using nanopore-based devices are emerging. In this review, we highlight the recent progress on the analytical methods for the interdisciplinary and fast- growing area of nanopore research. According to the dif- ferent types of the electrical readout, whether it is steady- state ionic current or transient current fluctuation, the nanopore-based sensing and analysis can be generally di- vided into two categories. For the first type, the electrical readout shows a stable blockade or reopening of the nanopore conductance in the presence of target analytes, termed steady-state analysis, including the conductance change, electrochemical analysis, and two-dimensional scanning and imaging. The other type is based on the transient fluctuation in the transmembrane ionic current, termed transient-state analysis, including the noise analysis, transient ion transport, and transverse tunneling current. The investigation of solid-state nanopores for chemical sensing is just in its infancy. For further research work, not only new nanopore materials and chemical modifications are needed, but also other non-electric-based sensing techniques should be developed. We will focus our future research in the framework of bio-inspired, smart, multiscale interfacial materials and extend the spirit of binary cooperative complementary nanomaterials. 展开更多
关键词 Nanopore Steady state Transient Sensing Stimuli response signal
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