原子系统非线性光学特性的量子相干控制研究
文献类型：学位论文
| 作者 | 刘呈普 |
| 学位类别 | 博士 |
| 答辩日期 | 2005 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 徐至展 |
| 关键词 | 量子相干控制 高次谐波 自发辐射相干 原子局域化 |
| 其他题名 | Study of Quantum coherent control to the nonlinear optical proterties of atomic systems |
| 中文摘要 | 量子相干控制研究是国际上近年来兴起的激光物理和量子光学等学科交叉前沿领域，深入开展原子系统非线性光学特性的量子相干控制研究，将会促进光物理、光化学、光生物学、量子信息科学及阿秒科学等许多新兴或交叉学科的发展，极具挑战性并可望有重要突破。本论文分别就强场作用下的高次谐波辐射和弱场作用下的原子局域化、光学双稳及电磁感应吸收等方面的量子相干控制进行了深入的研究，取得了一些富有创新性的研究成果。这些成果主要包括：1．在强场驱动二能级原子系统中进行了量子相干控制谐波等光谱性质的研究，发现双场相干控制可以显著改变高阶拉曼光谱和高次谐波光谱的特性。特别是当采用我们首次提出的强基频场与频率处于平台截止区的弱高频场组合的新方案，发现由于光场间的干涉相长效应高次谐波平台成倍数量级拓展。2．详细探讨了自发辐射相干对三能级原子系统非线性光学特性的相十'控制，发现自发辐射相干效应显著影响系统相干集居数陷落的动态演化行为。调节光场间的相对位相可实现对系统演化时间尺度的位相控制，可加快也可以延缓系统的演化进程。3．首次在近兼并Lombda型三能级原子系统中提出了一种自发辐射相干诱导产生电磁感应吸收的新机制。发现通过调节相干场间的相对相位可实现对电磁I感应透明和电磁感应吸收相互转换的位相控制。另外还研究了该类型原子介质处于环形腔内时所表现出来的稳态非线性行为，发现自发辐射相干可以诱导产生光学双稳和多稳。4．首次利用四能级原子系统双暗态共振干涉效应，提出了1种实现原子局域化的新方案，调节双暗态之间的相互作用可实现原子在波场节点位置的局域化，具有其它方案所没有的独特优势。另外还利用封闭的环形Lombd。系统实现了对原子局域化的相干控制：位相控制可以显著提高原子在亚波长内的探测概率，幅度控制可改善原子局域化的效果。 |
| 英文摘要 | Study to quantum coherent control is the rising cross-research area of laser physics, quantum optics and other disciplines, further and in-depth research in quantum coherent control to the nonlinear optical properties of atomic systems, which is full of challenges and great breakthroughs, must be to give great contributions to the rapid development of optical physics, optical chemistry, optical biology, quantum information and attosecond technologies and other rising or cross disciplines. In this paper, quantum coherent control to high harmonics generation in the condition of high-intensity fields and controls to atom localization, optical bistability, electromagnetically induced absorption, and so on, under influence of weak fields, are given respectively. The main innovative and important results are listed as follows, In the two-level atomic system strongly driven by laser fields, the two-color coherent control to the hyper-order Raman and harmonics spectrum is given, especially using a new scheme of the combination of a fundamental field with its weak high harmonics field for first time proposed by us to control the high harmonics generation and find that the plateau is significantly extended due to their constructive interference. The detailed investigation to the effect of spontaneously generated coherence on the nonlinear optical properties of three-level atomic systems is given, and it is found that spontaneously generated coherence affects significantly the dynamic evolution of coherent population trapping. For the first time, phase control to the dynamic evolution of this system by means of adjusting relative phases is realized, and changing phases can lengthen or reduce the dynamical time scale. It is for the first time to propose one new mechanism of spontaneously generated coherence induced electromagnetically induced absorption in a nearly degenerated A -type atomic system, and is found that adjusting the relative phase of the two coherent fields can make electromagnetically induced transparency and absorption transform mutually. Moreover the nonlinear behavior of such an atomic medium is investigated, and spontaneously generated coherence can induce optical bistability and also multistability. In the four-level atomic system, one novel scheme of atom localization based on the interference of two dark resonances is for the first time proposed. To adjust the interaction of the two dark resonances can achieve the atom's localization in the nodes of the standing wave field, which is more advantageous than any other schemes of atom localization. On the other hand, in a loop three-level atomic system, it is realized to coherent control to atom localization: phase control can increase evidently the detecting probability within the subwavelength of the driving standing wave field, and amplitude control improves the degree of atom localization. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15844]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 刘呈普. 原子系统非线性光学特性的量子相干控制研究[D]. 中国科学院上海光学精密机械研究所. 2005. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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