Field-free molecular orientation control due to ramped pulses

Arya, Urvashi; Prasad, Vinod

doi:10.1103/physreva.87.035402

Cited by 15 publications

(6 citation statements)

References 34 publications

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“…At low temperature, a very high degree of orientation can be obtained using such control strategies and a molecular quantum-state selection [32,33,34,35]. Control schemes in the sudden regime, where the duration of the control field is short with respect to the rotational period, have been also developed [36,37,38,39,40,12,41,42,43,44,45,46,47,48,49,50,51,52]. Among other techniques, we can mention the interaction of the molecule with a terahertz (THz) laser pulse and the (ω, 2ω)-scheme.…”

Section: Introductionmentioning

confidence: 99%

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

et al. 2016

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We investigate experimentally and numerically the field-free orientation of the symmetric top molecule of methyl-iodide at high temperature using a terahertz radiation generated by a plasma induced by a two-color laser beam. The degree of orientation is measured from the free-induction decay emitted by the sample. The observed experimental signal is reproduced with a good accuracy by numerical simulations.

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Section: Introductionmentioning

confidence: 99%

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

et al. 2016

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Section: Orientation By Ramped Pulsesmentioning

confidence: 99%

“…Urvashi et al [100] have studied NAREX using ramped pulses and combining ramped pulses with Gaussian pulses and square pulses. They have also discussed impact of ramped pulses on the orientation of a polar HBr molecule [100]. Using rigid rotor approximation, the effective Hamiltonian for molecule with interacting laser field is given by:…”

Section: Orientation By Ramped Pulsesmentioning

confidence: 99%

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

Nautiyal,

Devi,

Tyagi

et al. 2020

Preprint

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We review on the theoretical status of intense laser orientation and alignment-a field at the interface between intense laser physics and chemical dynamics with the potential applications ranging from high harmonic generation, nano-scale processing and control of chemical reactions. 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. It is focussed that the train of pulses proves to be quite efficient in increasing the orientation or alignment of a molecule without causing the molecule to ionize. The orientation and alignment both can occur in adiabatic and non-adiabatic conditions with the rotational

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“…The envelope shape used in the above works is mainly Gaussian shape. With the development of pulse shaping technology in recent years, various shapes of laser pulses have appeared and been used to control molecular orientation [50][51][52][53][54]. Therefore, a problem worth exploring is how to select a suitable envelope shape of the laser pulse to further optimize molecular orientation according to the different requirements for orientation degree and duration.…”

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confidence: 99%

Controlling molecular orientation by laser pulses with two different envelope shapes

Guo

Zhou

Chai

et al. 2021

Int J of Quantum Chemistry

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We use density matrix theory to numerically simulate the orientation of LiH molecules induced by laser pulses with two different envelope shapes. The results show that the envelope shape of the terahertz single-cycle laser pulse (SCP) has significant effects on molecular orientation degree and duration. When a SCP with adjusted laser field amplitude and carrier envelope phase is used to steer the molecular orientation, a larger orientation degree can be obtained by the Gaussian-shaped SCP, while a longer orientation duration can be realized by the sin 2 -shaped SCP.When combined with the two-color femtosecond laser pulse, the sin 2 -shaped SCP is better than Gaussian-shaped SCP, either in improving orientation degree and duration or in stability and controllability shown with increasing temperature. The optimal molecular orientation can be realized under the combination of the two-color femtosecond laser pulse and sin 2 -shaped SCP which has the appropriate delay time: the maximal orientation degree reaches 0.801 at 0 K and 0.450 at 20 K, the maximal orientation duration is 31.3% of the rotational period at 0 K.

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Field-free molecular orientation control due to ramped pulses

Cited by 15 publications

References 34 publications

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

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

Controlling molecular orientation by laser pulses with two different envelope shapes

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