Active control scheme and mechanism in the two-pulse molecular alignment

Zhao, Shitong; Lu, Hui; Liu, Peng; Li, Ruxin; Xu, Zhizhan

doi:10.1016/j.cplett.2011.02.049

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…Alignment of molecular axes has been implemented with transform-limited and shaped laser pulses using various approaches (see, e.g., [1,2,[22][23][24][25]). Increasing the degree of molecular alignment has been achieved by employing a sequence of laser pulses (a "pulse train") separated by the time of rotational revival [26][27][28][29]. Varying the time delay between pulses has been used to promote molecules to a particular angular momentum state [30].…”

Section: Introductionmentioning

confidence: 99%

Directional spinning of molecules with sequences of femtosecond pulses

et al. 2012

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We present an analysis of two experimental approaches to controlling the directionality of molecular rotation with ultrashort laser pulses. The two methods are based on the molecular interaction with either a pair of pulses (a "double kick" scheme) or a longer pulse sequence (a "chiral pulse train" scheme). In both cases, rotational control is achieved by varying the polarization of and the time delay between the consecutive laser pulses. Using the technique of polarization sensitive resonance-enhanced multi-photon ionization, we show that both methods produce significant rotational directionality. We demonstrate that increasing the number of excitation pulses supplements the ability to control the sense of molecular rotation with quantum state selectivity, i.e. predominant excitation of a single rotational state. We also demonstrate the ability of both techniques to generate counter-rotation of molecular nuclear spin isomers (here, ortho- and para-nitrogen) and molecular isotopologues (here, 14N_2 and 15N_2).Comment: 8 pages, 10 figure

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Section: Introductionmentioning

confidence: 99%

Directional spinning of molecules with sequences of femtosecond pulses

et al. 2012

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Effects of aligning pulse duration on the degree and the slope of nitrogen field-free alignment

2012

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Through theoretical analysis, we show how aligning pulse durations affect the degree and the time-rate slope of nitrogen field-free alignment at a fixed pulse intensity. It is found that both the degree and the slope first increase, then saturate, and finally decrease with the increasing pump duration. The optimal durations for the maximum degree and the maximum slope of the alignment are found to be different. Additionally, they are found to mainly depend on the molecular rotational period, and are affected by the temperature and the aligning pump intensities. The mechanism of molecular alignment is also discussed.

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Control of Molecular Rotation with a Chiral Train of Ultrashort Pulses

et al. 2011

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Trains of ultrashort laser pulses separated by the time of rotational revival (typically, tens of picoseconds) have been exploited for creating ensembles of aligned molecules. In this work we introduce a chiral pulse train--a sequence of linearly polarized pulses with the polarization direction rotating from pulse to pulse by a controllable angle. The chirality of such a train, expressed through the period and direction of its polarization rotation, is used as a new control parameter for achieving selectivity and directionality of laser-induced rotational excitation. The method employs chiral trains with a large number of pulses separated on the time scale much shorter than the rotational revival (a few hundred femtosecond), enabling the use of conventional pulse shapers.

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Active control scheme and mechanism in the two-pulse molecular alignment

Cited by 4 publications

References 34 publications

Directional spinning of molecules with sequences of femtosecond pulses

Directional spinning of molecules with sequences of femtosecond pulses

Effects of aligning pulse duration on the degree and the slope of nitrogen field-free alignment

Control of Molecular Rotation with a Chiral Train of Ultrashort Pulses

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