Importance of intensity-to-phase coupling for water-window high-order-harmonic generation with few-cycle pulses

Teichmann, Stephan; Silva, Francisco; Cousin, Seth L.; Biegert, J.

doi:10.1103/physreva.91.063817

Cited by 9 publications

(6 citation statements)

References 45 publications

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“…The measured soft X-ray continua support extremely short durations of 18 and 13 as in neon and helium, respectively. Moreover, driving soft X-ray continua and attosecond generation with a sub-2-cycle pulse is indeed preferable as we have recently demonstrated that a high level of ionization, such as for the conditions of high-pressure phase matching and long wavelengths, has an adverse effect on spectral stability and it could prevent reproducible attosecond pulse generation altogether 26 . Alternative approaches to generate spectral continua, and isolated attosecond pulses, from multi-cycle driving pulses rely on some form of temporal confinement of recollision such that it effectively occurs only once 11 27 28 .…”

Section: Resultsmentioning

confidence: 99%

0.5-keV Soft X-ray attosecond continua

et al. 2016

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Attosecond light pulses in the extreme ultraviolet have drawn a great deal of attention due to their ability to interrogate electronic dynamics in real time. Nevertheless, to follow charge dynamics and excitations in materials, element selectivity is a prerequisite, which demands such pulses in the soft X-ray region, above 200 eV, to simultaneously cover several fundamental absorption edges of the constituents of the materials. Here, we experimentally demonstrate the exploitation of a transient phase matching regime to generate carrier envelope controlled soft X-ray supercontinua with pulse energies up to 2.9±0.1 pJ and a flux of (7.3±0.1) × 107 photons per second across the entire water window and attosecond pulses with 13 as transform limit. Our results herald attosecond science at the fundamental absorption edges of matter by bridging the gap between ultrafast temporal resolution and element specific probing.

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Section: Resultsmentioning

confidence: 99%

0.5-keV Soft X-ray attosecond continua

et al. 2016

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“…Corresponding photon fluxes of the source at the carbon K-edge at 284 eV are (2.8 ± 0.1)x10 7 photons/s/10% bandwidth (BW) in Ne and (1.8 ± 0.1)x10 6 photons/s/10% BW in He. We have recently investigated the conditions for high pressure phase matching and shown that generation of an isolated and short attosecond SXR pulses is favored [6,7]. Hence, the water window continuum generated in Ne was characterized with photoelectron streaking.…”

Section: Resultsmentioning

confidence: 99%

Isolated Attosecond Water-Window Pulses driven by 1.8 μm lasers

Cousin¹,

Li²,

Ren³

et al. 2016

International Conference on Ultrafast Phenomena

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“…[19] show that the idea of HCO can be applied to the high-energy coherent photoelectrons and also extended the spectral range of HCO to soft X-ray harmonics. Half-cycle cutoff features up to 385 eV using HHG with two-cycle, carrier-envelope-phase-controlled pulses at 1.85 µm are demonstrated [20].…”

Section: Introductionmentioning

confidence: 97%

Tunability of Half Cycle Cutoff Harmonics with Inhomogeneously Enhanced Laser Pulse

Mandal

2023

Atoms

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For homogeneous driving, half cycle harmonics and its corresponding half cycle cutoff (HCO) show prominent spectral features, allowing one to produce an isolated attosecond pulse with suitable filtering, or vice versa the retrieval of the driving pulse itself. The temporal profile and spatial dependence of the inhomogeneously enhanced field are two important factors that determine the high harmonic generation (HHG) near a plasmonic nanostructure. This leads us to the question of how the HHG spectra and, in particular, the corresponding half cycle harmonics modify with different types of inhomogeneously enhanced fields. To elucidate this, we have made a comparative study of the HHG in three different types of inhomogeneously enhanced laser pulses by employing the time-dependent Schrödinger equation in one dimension. Within our chosen parameter range, the HCO in cutoff and mid-plateau regimes shift towards higher order with the increase of strength of the inhomogeneity in isotropic case. In anisotropic inhomogeneity, the cutoff HCO shifts towards the higher order but the mid-plateau HCO shifts towards lower order with the increase of strength of inhomogeneity. With increasing carrier envelope phase (CEP), the enhanced HCO in the lower-order harmonic region shifts towards higher orders. This shift is nearly linear from near the above threshold to mid-plateau region and becomes saturated in the near cutoff region. The harmonic spectra is modulo-π periodic for the isotropic inhomogeneity and it is modulo-2π periodic for the anisotropic inhomogeneity. This extension of periodicity increases the tunability of the enhanced HCO harmonics with CEP in the anisotropic inhomogeneity than the CEP tuning of the HCO harmonics in the isotropic inhomogeneity or vice versa the retrieval of CEP.

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Importance of intensity-to-phase coupling for water-window high-order-harmonic generation with few-cycle pulses

Cited by 9 publications

References 45 publications

0.5-keV Soft X-ray attosecond continua

0.5-keV Soft X-ray attosecond continua

Isolated Attosecond Water-Window Pulses driven by 1.8 μm lasers

Tunability of Half Cycle Cutoff Harmonics with Inhomogeneously Enhanced Laser Pulse

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