Field-free molecular orientation by two-color femtosecond laser pulse and time-delayed THz laser pulse

Dang, Hai-Ping; Zhan, Wei-Shen; Han, Xiao; Zai, Jing-Bo

doi:10.1088/1054-660x/25/7/075301

Cited by 6 publications

(5 citation statements)

References 44 publications

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“…The combination of both, a dc field and a non-resonant laser pulse allows for a large degree of orientation and alignment in the adiabatic limit for linear [14][15][16][17] and asymmetric molecules [18][19][20][21][22][23], but it is extremely difficult to reach in general [22,23]. Many other experimental setups have been proposed to enhance the alignment of a molecular ensemble using external fields, such as the application of two laser pulses with different polarizations [24][25][26], the application of single cycle pulses [27] and single THz pulses [28,29], or a combination of THz and femtosecond laser [30,31] to efficiently achieve both orientation and alignment.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of asymmetric super-rotors: Alignment and orientation

Omiste

2018

Phys. Rev. A

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We report a theoretical study of the optical centrifuge acceleration of an asymmetric top molecule interacting with an electric static field by solving the time-dependent Schrödinger equation in the rigid rotor approximation. A detailed analysis of the mixing of the angular momentum in both the molecular and the laboratory fixed frames allow us to deepen the understanding of the main features of the acceleration process, for instance, the effective angular frequency of the molecule at the end of the pulse. In addition, we prove numerically that the asymmetric superrotors rotate around one internal axis and that their dynamics is confined to the plane defined by the polarization axis of the laser, in agreement with experimental findings. Furthermore, we consider the orientation patterns induced by the dc field, showing the characteristics of their structure as a function of the strength of the static field and the initial configuration of the fields.

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Section: Introductionmentioning

confidence: 99%

Theoretical study of asymmetric super-rotors: Alignment and orientation

Omiste

2018

Phys. Rev. A

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“…However, by superposing harmonics in the supercontinuum, we can still derive an EP IAP with ellipticity above 0.5 (0.68, 0.71, and 0.5 for orientation degrees of 0.8, 0.6, and 0.4, respectively). It is worth mentioning that several methods have recently been proposed to achieve a high degree of molecular orientation [43][44][45]. methods can be combined with our scheme to achieve the generation of largely EP, but even CP IAPs.…”

Section: Resultsmentioning

confidence: 99%

The Generation of Circularly Polarized Isolated Attosecond Pulses with Tunable Helicity from CO Molecules in Polarization Gating Laser Fields

Chen,

Yuan,

Wang

et al. 2024

Photonics

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We theoretically demonstrate a scheme to generate circularly polarized (CP) isolated attosecond pulses (IAPs) with tunable helicity using a polarization gating laser field interacting with the CO molecule. The results show that a broadband CP supercontinuum is produced from the oriented CO molecule, which supports the generation of an IAP with an ellipticity of 0.98 and a duration of 90 as. Furthermore, the helicity of the generated harmonics and IAP can be effectively controlled by modulating the laser field and the orientation angle of the CO molecule. Our method will advance research on chiral-specific dynamics and magnetic circular dichroism on the attosecond timescale.

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“…(b) Molecular rotation effects. A number of recent works address processes involving the rotational alignment of diatomic molecules under strong non-resonant fields in the presence of resonant THz field [35][36][37]. Indeed, a strong THz field is capable of aligning and orienting molecules [38,39], and recently, field-free alignment of neutral N2 with single-cycle THz fields has been observed [40].…”

Section: Appendix B Ruling Out Alternative Mechanisms That Could Leamentioning

confidence: 99%

Terahertz control of air lasing

et al. 2019

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The coherent emission from ionized nitrogen molecules is of interest for remote sensing and astronomical applications. To initiate the lasing process, we used an intense ultrashort near-infrared (NIR) pulse overlapped with a terahertz (THz) single-cycle pulse. We observed that coherent emission could be seeded and modulated by the amplitude of the THz field, which is the result of a combined effective second-order nonlinear polarization and the nonlinear effects induced by the NIR pump. Our results shed new light on the role of intense transient fields in the coherent emission from photoexcited gas molecules.

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Field-free molecular orientation by two-color femtosecond laser pulse and time-delayed THz laser pulse

Cited by 6 publications

References 44 publications

Theoretical study of asymmetric super-rotors: Alignment and orientation

Theoretical study of asymmetric super-rotors: Alignment and orientation

The Generation of Circularly Polarized Isolated Attosecond Pulses with Tunable Helicity from CO Molecules in Polarization Gating Laser Fields

Terahertz control of air lasing

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