论文标题

由形状激光脉冲驱动的极性分子的方向和比对动力学

Orientation and Alignment Dynamics of Polar Molecule Driven by Shaped Laser Pulses

论文作者

Nautiyal, Vijit V., Devi, Sumana, Tyagi, Ashish, Vidhani, Bhawna, Maan, Anjali, Prasad, Vinod

论文摘要

我们回顾了强烈激光取向和对齐的理论状态。旋转波数据包的演变及其动力学导致方向和对齐的动力是当前讨论的主题。本文的主要部分基本上概述了通过形状激光脉冲控制分子的方向和比对动力学的最新理论进步。讨论了从静态静电场与激光场结合使用,定向和对齐场的组合,排列场的组合,定向场的组合,脉冲列的应用等组合的各种理论方法。考虑到分子的旋转周期,方向和对齐都可以在绝热和非绝热条件下发生。讨论主要限于非绝热旋转激发(Narex)。将特定的焦点放在所谓的半循环脉冲(HCP)和平方脉冲(SQP)上。斜坡脉冲的效果也被关注。还涉及碰撞对各种激光参数的影响。我们通过提出一种一致的理论方法来总结当前的讨论,以描述这种脉冲对分子运动的作用。计算和分析特定脉冲形状对脉冲后动力学的影响。对齐的概念从一维对准延伸到三维对齐,并正确选择分子和偏振光。我们通过讨论强烈激光取向和对齐的潜在应用来结束这篇文章。

We review on the theoretical status of intense laser orientation and alignment. The evolution of the rotational wave packet and its dynamics leading to orientation and alignment is the topic of the present discussion. The major part of the article basically presents an overview on recent theoretical progress in controlling the orientation and alignment dynamics of a molecule by means of shaped laser pulses. The various theoretical approaches that lead to orientation and alignment ranging from static electrostatic field in combination with laser field(s), combination of orienting and aligning field, combination of aligning fields, combination of orienting fields, application of train of pulses etc. are discussed. The orientation and alignment both can occur in adiabatic and non-adiabatic conditions with the rotational period of the molecule into consideration. The discussion is mostly limited to non-adiabatic rotational excitation (NAREX). A particular focus is put on the so called half-cycle pulse (HCP) and square pulse (SQP). The effect of ramped pulses is also under focus. The effect of collision on the various laser parameters is also given concern. We summarize the current discussion by presenting a consistent theoretical approach for describing the action of such pulses on movement of molecules. The impact of a particular pulse shapes on the post-pulse dynamics is calculated and analysed. The concept of alignment is extended from one-dimensional alignment to three-dimensional alignment with the proper choice of molecule and the polarised light. We conclude the article by discussing the potential applications of intense laser orientation and alignment.

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