Generation of Near‐Circularly Polarized Attosecond Pulse with Tunable Helicity by Unidirectionally Rotating Laser Field

Yuan, Hua; He, Lixin; Njoroge, Stephen Maina; Wang, Dian; Shao, Renzhi; Lan, Pengfei; Lu, Peixiang

doi:10.1002/andp.201900570

Cited by 13 publications

(4 citation statements)

References 65 publications

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“…[37], to control the angular momentum orientation of N 2 molecules. Later on, other molecular scenarios were studied [38][39][40][41][42][43]. This polarization deserves a different classification from linear, circular or elliptical and, taking into account its mathematical expression, we will call it amplitude polarization (AP).…”

Section: Amplitude-polarized Pulsesmentioning

confidence: 99%

“…This polarization deserves a different classification from linear, circular or elliptical and, taking into account its mathematical expression, we will call it amplitude polarization (AP). However, its denomination is not unified in the literature, and different authors refer to it in different ways, namely, unidirectional polarization [39],…”

Section: Amplitude-polarized Pulsesmentioning

confidence: 99%

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Twisting attosecond pulse trains by amplitude-polarization IR pulses

Neyra¹,

Videla²,

Biasetti³

et al. 2023

Preprint

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Natively, atomic and molecular processes develop in a sub-femtosecond time scale. In order to, for instance, track and capture the electron motion in that scale we need suitable 'probes'. Attosecond pulses configure the most appropriate tools for such a purpose. These ultrashort bursts of light are generated when a strong laser field interacts with matter and high-order harmonics of the driving source are produced. In this work, we propose a way to twist attosecond pulse trains. In our scheme, each of the attosecond pulses in the train has a well-defined linear polarization, but with a different polarization angle between them. To achieve this goal, we consider an infrared pulse with a particular polarization state, called amplitude polarization. This kind of pulse was experimentally synthesized in previous works. Our twisted attosecond pulse train is then obtained by nonlinear driving an atomic system with that laser source, through the high-order harmonics generation phenomenon. We reach a high degree of control in the polarization of the ultrashort coherent XUV-generated radiation. Through quantum mechanical simulations, supplemented with signal processing tools, we are able to dissect the underlying physics of the generation process.We are confident these polarized-sculpted XUV sources will play an instrumental role in future pump-probe-based experiments. Classical electrodynamics and quantum mechanics are the fundamental building blocks for the description of many natural phenomena. By measuring the wavelength and speed of light, electromagnetism provides us with tools to extract the velocity of the light field oscillations. Likewise, quantum mechanics links the rapidity of electronic motion with the energy distribution of the populated quantum states. By adequately tuning the light sources, these states can be accessed by photon absorption and emission. The native scale of both the light oscillations and electron dynamics falls within the attosecond range. These elementary processes comprise the constitutional steps of any change in the physical, chemical, and biological properties of materials and soft matter. The capability of capturing and manipulating them in real-time is therefore relevant for the development of novel materials and technologies, as well as the understanding of fundamental atomic and molecular phenomena initiated by light fields [1, 2]. Since the first measurement of an attosecond pulse train (APT) [3], attosecond science has grown enormously, from the obtaining of an isolate attosecond pulse (IAP) [4] to the

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Section: Amplitude-polarized Pulsesmentioning

confidence: 99%

Section: Amplitude-polarized Pulsesmentioning

confidence: 99%

Twisting attosecond pulse trains by amplitude-polarization IR pulses

Neyra¹,

Videla²,

Biasetti³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…During the past years, polar molecules have been examined extensively. For example, in [14] a method to produce circularly polarized attosecond pulses with tunable helicity was proposed using a CO molecule as target. Moreover, the effects of the ionization asymmetry on the HHG spectra of the oriented CO molecule were investigated in [15], while imprints of the multielectron polarization effects on the odd and even harmonic spectra were analyzed in [16].…”

Section: Introductionmentioning

confidence: 99%

Control of odd and even harmonic generation by bichromatic elliptically polarized fields

Šišić

Habibović

Milošević

2022

J. Phys.: Conf. Ser.

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Using the CO molecule as target, we investigate high-order harmonic generation by a bichromatic elliptically polarized laser field. This field consists of two elliptically polarized components with the commensurable frequencies and mutually orthogonal semi-major axes. Both odd and even harmonics are emitted and their ellipticity can be large depending on the values of the laser-field parameters. It is often the case that the ellipticity of subsequent odd and even harmonics is substantially different so that, in order to produce a series of high-order harmonics with similar ellipticity, it is beneficial if the emission of odd or even harmonics is suppressed. In this paper we explore how this can be achieved using the ellipticity of the laser-field components and the relative phase as control parameters. For some values of these parameters it is possible to produce a comb of odd or even harmonics with similar ellipticity. These harmonics can later be employed for various applications the example of which is the generation of an elliptically polarized attosecond pulse train.

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“…More recently, generation of a single attosecond pulse with the help of the asymmetric polarization-gating technique was analyzed [60], as well as with three-color electric fields [61]. Also, in [62] the influence of the time and space inhomogeneities of the laser field on the HHG spectra and the attosecond pulses was investigated, while in [63] a method to produce circularly polarized attosecond pulses with tunable helicity from a CO molecule was proposed. Finally, it was shown that the ellipticity of attosecond pulses can be controlled in plasmonic-enhanced counter-rotating bicircular fields [64].…”

Section: Introductionmentioning

confidence: 99%

High-order harmonic generation by planar polyatomic molecules exposed to an orthogonally polarized two-color laser field

Habibović¹,

Becker²,

Milošević³

2021

J. Phys. B: At. Mol. Opt. Phys.

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The molecular strong-field approximation is employed to study high-order harmonic generation by linear and planar polyatomic molecules exposed to an orthogonally polarized two-color laser field, which consists of two orthogonal linearly polarized components with commensurable frequencies. For such a driving field, we find that the harmonic emission rate and the shape of the spectrum strongly depend on the laser-field parameters including the relative phase and the ratio of the intensities of the two components. The values of the relative phase that correspond to the optimal harmonic emission rate, as well as the cutoff position, can be assessed using a classical model. The possible production of an isolated attosecond pulse is investigated. For suitable symmetry of the laser field an attosecond pulse train with only one attosecond pulse per cycle can be generated. Depending on the frequencies of the two field components, the molecular symmetry properties and the orientation of the molecule with respect to the field, the even harmonics can be absent from the spectrum, which can be used to determine the molecular orientation. The emitted harmonics are elliptically polarized and their ellipticity depends on the molecular orientation.

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Generation of Near‐Circularly Polarized Attosecond Pulse with Tunable Helicity by Unidirectionally Rotating Laser Field

Cited by 13 publications

References 65 publications

Twisting attosecond pulse trains by amplitude-polarization IR pulses

Twisting attosecond pulse trains by amplitude-polarization IR pulses

Control of odd and even harmonic generation by bichromatic elliptically polarized fields

High-order harmonic generation by planar polyatomic molecules exposed to an orthogonally polarized two-color laser field

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