Three-dimensional carrier-envelope-phase map of focused few-cycle pulsed Gaussian beams

Porras, Miguel A.; Horváth, Z. L.; Major, Balázs

doi:10.1103/physreva.98.063819

Cited by 20 publications

(12 citation statements)

References 45 publications

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“…The spatial ΔCEP( x , y , z ) distribution of a short, broad-spectrum beam can acquire various shapes as measured in earlier studies 25 , 26 , 35 , and supported by theoretical studies 26 , 45 – 47 . In Fig.…”

Section: Resultssupporting

confidence: 59%

Carrier-envelope phase on-chip scanner and control of laser beams

Hanus,

Fehér,

Csajbók

et al. 2023

Nat Commun

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The carrier-envelope phase (CEP) is an important property of few-cycle laser pulses, allowing for light field control of electronic processes during laser-matter interactions. Thus, the measurement and control of CEP is essential for applications of few-cycle lasers. Currently, there is no robust method for measuring the non-trivial spatial CEP distribution of few-cycle laser pulses. Here, we demonstrate a compact on-chip, ambient-air, CEP scanning probe with 0.1 µm3 resolution based on optical driving of CEP-sensitive ultrafast currents in a metal−dielectric heterostructure. We successfully apply the probe to obtain a 3D map of spatial changes of CEP in the vicinity of an oscillator beam focus with pulses as weak as 1 nJ. We also demonstrate CEP control in the focal volume with a spatial light modulator so that arbitrary spatial CEP sculpting could be realized.

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Section: Resultssupporting

confidence: 59%

Carrier-envelope phase on-chip scanner and control of laser beams

Hanus,

Fehér,

Csajbók

et al. 2023

Nat Commun

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“…. Complete descriptions of the phase at arbitrary longitudinal and transverse locations throughout the focal volume have been derived for linearly polarized light [16,23,24], but we will consider rather the longitudinal field produced from focusing radially-polarized Gaussian light fields for the acceleration application.…”

Section: (B))mentioning

confidence: 99%

On the importance of frequency-dependent beam parameters for vacuum acceleration with few-cycle radially polarized laser beams

Jolly¹

2020

Opt. Lett.

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Tightly-focused, ultrashort radially-polarized laser beams have a large longitudinal field, which provides a strong motivation for direct particle acceleration and manipulation in vacuum. The broadband nature of these beams means that chromatic properties of propagation and focusing are important to consider. We show via single particle simulations that using the correct frequencydependent beam parameters is imperative, especially as the pulse duration decreases to the few-cycle regime. The results with different spatio-spectral amplitude profiles show both a drastic increase or decrease of the final accelerated electron energy depending on the shape, motivating both proper characterization and potentially a route to optimization.

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“…(1) and ( 2) and r max = 0] only introduces minor changes on the pulse temporal shape [Figs. 2(a), (b) and (c)], irrespective of the particular value of g 0 , i. e., the pulse continues to be an approximately single-cycle, Gaussianlike pulse during the whole propagation [42], with slightly blue shifted frequency for g 0 > 0, and red shifted frequency for g 0 < 0 about the focus [38,39,44], and with different maps of carrier-envelope phase in the focal vol-ume, as studied in detail in [44,48].…”

Section: B Previous Results and Open Problemsmentioning

confidence: 99%

“…Fortunately, for pulses with at least one carrier oscillation, it has been theoretically suggested and experimentally demonstrated that it is only the variation of the Rayleigh distance with frequency in the vicinity of the carrier frequency ω 0 that determines most of propagation properties of pulsed beams [44,46,48]. The different situations are suitably described by a single dimensionless parameter called the g 0 -factor defined as [44]…”

Section: Preliminaries On Ultrafast Laguerre-gauss Vorticesmentioning

confidence: 99%

“…For ultrafast Gaussian beams, a small red or blue carrier frequency shift experienced during propagation is determined by its g 0 -factor. More importantly, the g 0 -factor also determines the carrier-envelope phase distribution in the focal volume [44,48]. This is why the g 0 -factor of the source has proved to be a crucial parameter in phase-sensitive light-matter interactions, as in [46,47] for electron photoemission, and in [49] for electron acceleration with radially polarized pulses, since the outcome of experiments depend significantly on the g 0 -factor.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

General laws of the propagation of ultrafast vortices in free space

Porras,

García-Álvarez

2020

Preprint

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We conduct a theoretical study of the propagation of few-cycle, ultrafast vortices (UFVs) carrying orbital angular momentum (OAM) in free space. Our analysis reveals much more complex temporal dynamics than that of few-cycle fundamental Gaussian-like beams, particularly when approaching the single-cycle regime and the magnitude of the topological charge l is high. The recently described lower bound |l| to the number of oscillations of UFVs with propagation-invariant temporal shape (isodiffracting UFVs) is found to hold on average also for UFVs of general type, with variations along the propagation direction above and below that bound, even vanishing locally. These variations are determined by the so-called Porras factor or g0-factor characterizing the dependence of the Rayleigh distance of the spectral constituents with frequency. With a given available bandwidth, UFVs must widen temporally with increasing magnitude of the topological charge, and must widen or may shrink temporally during propagation as a result of the axially varying, g0-dependent lower bound. Under very restrictive conditions in their generation, an UFV can be shrunk below the lower bound |l| at a focus into a kind of locally compressed state of OAM, but it broadens well-above |l| and distorts in a tiny fraction of the depth of focus because of the dispersions introduced by Gouy's phase and wave front mismatch. These propagation phenomena have implications and should be taken into account in experiments and applications of UFVs, such as the generation of high-harmonics and attosecond pulses with high OAM, or in OAM-based ultrafast communications systems, as well as in other areas of physics such as acoustics or electron waves.

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Three-dimensional carrier-envelope-phase map of focused few-cycle pulsed Gaussian beams

Cited by 20 publications

References 45 publications

Carrier-envelope phase on-chip scanner and control of laser beams

Carrier-envelope phase on-chip scanner and control of laser beams

On the importance of frequency-dependent beam parameters for vacuum acceleration with few-cycle radially polarized laser beams

General laws of the propagation of ultrafast vortices in free space

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