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题名	周期量级超短激光脉冲诱导极端非线性光学特性研究
作者	夏可宇
学位类别	博士
答辩日期	2007
授予单位	中国科学院上海光学精密机械研究所
导师	龚尚庆
关键词	周期量级超短激光脉冲 绝对相位 面积定理 极端非线性光学
其他题名	Study on extremely nonlinear optical phenomena induced by few-cycle laser pulses
中文摘要	周期量级超短激光脉冲与物质相互作用是国际上近年来兴起的激光物理学前沿课题。开展周期量级超短激光脉冲在原子等介质中引起的极端非线性光学特性研究，能够丰富非线性光学内容，并将促进光物理、量子信息科学及阿秒科学等新兴或交叉学科的发展。 本论文主要就周期量级超短激光脉冲与原子等物质相互作用诱导极端非线性光学现象进行深入研究，取得的主要创新性研究成果包括： 1. 研究了洛伦兹局域场校正下周期量级超短激光脉冲在高密度二能级介质中的传播特性。发现考虑局域场校正和不考虑局域场校正相比较有本质变化：周期量级超短激光脉冲的绝对相位之差在局域场校正前后可以达到π；孤子面积大于2π，但是通过定义有效拉比频率，其面积仍然为2π，面积定理仍然成立。 2. 通过数值求解二维全波麦克斯韦-布洛赫耦合方程组，发现二维超短偶极孤子可以在二能级系统中诱导一种新型超快瞬态布居光栅和极化光栅，而且光栅结构可以通过改变孤子光束的束腰和面积来调控。 3. 探讨了ω-3ω双色周期量级超短激光脉冲在二能级介质传输过程中脉冲绝对相位对光谱效应的控制。研究表明当脉宽可与光学振荡周期相比拟时，绝对相位可以操控偶次谐波成份的增强或者分裂。 4. 提出了一种可以精确确定单个周期量级超短激光脉冲的绝对相位甚至其相位随时间变化特性的傅立叶分析新方法。该方法可以根据数值模拟结果或者实验数据确定脉冲的所有参数，而且与脉冲形状无关，每个光学振荡周期内只需要很少的抽样值。
英文摘要	The interaction of few-cycle laser pulses with matters is a frontier topic of laser physics. Recently, it has attracted a great number of interesting over the world. Research on the extremely nonlinear optical phenomena induced by few-cycle laser pulses in media, such as atoms etc., will reveal unknown domain in nonlinear optics. It is sure that this work give great contributions to the advance of rising or cross disciplines such as optical physics, quantum information and attosecond physics etc.. In my Ph. D. thesis, we have mainly investigated in-depth the extremely nonlinear optical phenomena induced by few-cycle laser pulses interacting with matters such as atoms. The main innovative achievements and important results are as follows: 1. The propagation behaviors of few-cycle pulses in a dense two-level medium are investigated by taking the Lorentz local field correction into account. Several novel features are found: the difference of the carrier-envelope phase between the cases with and without local field correction can go up to π; the areas of solitons are larger than 2π. However, the area theorem is valid for the effective Rabi frequency, whose area keeps 2π. 2. Novel ultrafast transient population and polarization gratings induced by a two-dimensional, ultrashort dipole soliton propagating in a two-level medium have been demonstrated by solving the full-wave Maxwell-Bloch equations. The number of lines and the period of the grating can be controlled by the beam waist and the area of the pulse. 3. Using a ω-3ω combination scenario, we investigated the absolute phase control of the spectra effects for few-cycle laser pulses propagating in a two-level medium. It is found that the absolute phase combinations can control the buildup or split of the even harmonics if the durations of few-cycle laser pulses become comparable with the optical period. 4. A Fourier analysis method is presented to accurately determine not only the absolute phase but also the temporal-pulse phase of an isolated few-cycle laser pulse. It is independent of the pulse shape and can fully characterize the light wave even though only a few samples per optical cycle are available by numerical simulations or in experiments.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15375]
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	夏可宇. 周期量级超短激光脉冲诱导极端非线性光学特性研究[D]. 中国科学院上海光学精密机械研究所. 2007.

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