李儒新

摘 要：該研究產(chǎn)生更短脈寬、更高光子能量與更高亮度的阿秒相干光源以及原子分子中阿秒電子波包的探測和控制，預(yù)期目標(biāo)主要包括：（1）實(shí)現(xiàn)亞飛秒時(shí)間尺度和原子級空間尺度內(nèi)實(shí)時(shí)觀測和控制電子動(dòng)力學(xué)行為；（2）在多電子弛豫過程中，電子重排、電子-電子碰撞動(dòng)力學(xué)等多電子復(fù)雜動(dòng)力學(xué)研究中取得若干突破；（3）揭示有重要意義的化學(xué)反應(yīng)的電子動(dòng)力學(xué)物理本質(zhì)。探索阿秒脈沖作用下物質(zhì)的電子動(dòng)力學(xué)新規(guī)律及其應(yīng)用。開展中紅外激光與氣體介質(zhì)相互作用產(chǎn)生高次諧波的實(shí)驗(yàn)和理論研究，采用雙色場方法獲得高次諧波連續(xù)譜，為進(jìn)一步將阿秒脈沖寬度測量和光子能量推進(jìn)到“水窗”做準(zhǔn)備。從理論上深入了解分子結(jié)構(gòu)和反應(yīng)通道和分子高次諧波之間的聯(lián)系，以及和激光參數(shù)之間的關(guān)系，為實(shí)驗(yàn)研究做準(zhǔn)備。獲得了一些系列研究成果，包括發(fā)現(xiàn)太赫茲輻射波形可以通過改變驅(qū)動(dòng)激光脈沖的CEP而實(shí)現(xiàn)控制，在光絲等離子體中太赫茲輻射發(fā)生極性反轉(zhuǎn)，利用周期量級極端超快激光脈沖光場自身的不對稱性獲得增強(qiáng)的太赫茲輻射；發(fā)現(xiàn)基于獨(dú)立電子近似的遂穿模型不能解釋次序雙電離中的許多現(xiàn)象等。

關(guān)鍵詞：阿秒 超快 量子控制

Abstract： This project work on the generation of the attosecond pulse of shorter pulse width， higher photon energy with higher brightness and the detection and the control of the attosecond electron wavepacket in the atoms and molecules including： （1） achievement of real-time observation and control of the electron dynamics during the sub-femtosecond timescale in the atomic-level spatial scales； （2） detection of the multielectron dynamics， e.g. multi-electron relaxation process， electronic rearrangement， e - e collision dynamics， etc； （3） revealing the electron mechanicsm of the chemical reaction kinetics. To explore the new mechanism and the application of the electron dynamics during its interaction with the attosecond pulse. We have carried out the study of the high order hamonics generation with mid-infrared laser experimentally and theoretically， by using the two color scheme to obtain high harmonic continuous spectrum， for further attosecond pulse width measurement and pushing the photon energy to the "water window" region. We also study the relationship beteween the molecular structures and reaction pathways and molecular harmonics theoretically， as well as the parameters of the laser pulse， for the future experimental study. We have obtained some results including the discovery of terahertz waveform control by changing the CEP of the laser pulse， polarity reversal of the terahertz electric field during the filamentation and the plasma， using the asymmetry of the few-cycle laser pulse to enhance terahertz radiation； discovering that the independent elecctron tunneling model can not explain many phenomena during the sequential double ionization.

Key Words： Attosecond； Ultrafast； Quantum control

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