Compensating chirp of attosecond X-ray pulses by a neutral hydrogen gas

Chang, Zenghu

doi:10.1364/osac.2.000314

Cited by 6 publications

(4 citation statements)

References 15 publications

(17 reference statements)

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“…It is, however, difficult to compensate atto-chirp above the carbon K-edge (282 eV) due to the lack of materials that exhibiting negative group velocity dispersion and low loss. It was illustrated theoretically that attochirp in the 300-1000 eV range can be reduced by hydrogen gas or plasma with the proper pressure-length product given that the transmission of the gas or plasma is higher than 10% 51,52 .…”

Section: Isolated Water Window X-ray Attosecond Pulsesmentioning

confidence: 99%

“…The transmission of ionized H 2 is even better. Single-atom simulations based on the strong-field approximation [54][55][56][57][58] of high-harmonic generation have been performed to demonstrate feasibility of the atto-chirp compensation in the 300-500 eV 51 and 530-1000 eV 52 photon energy regions. It has been shown that isolated attosecond pulses as short as 25-as are achievable when high-harmonic generation in helium is driven by single-cycle lasers centered at 1.7 μm or 3.2 μm.…”

Section: Isolated Water Window X-ray Attosecond Pulsesmentioning

confidence: 99%

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Attosecond science based on high harmonic generation from gases and solids

Li¹,

Lu²,

Chew³

et al. 2020

Nat Commun

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220

126

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Recent progress in high power ultrafast shortwave and mid-wave infrared lasers has enabled gas-phase high harmonic generation (HHG) in the water window and beyond, as well as the demonstration of HHG in condensed matter. In this Perspective, we discuss the recent advancements and future trends in generating and characterizing soft X-ray pulses from gasphase HHG and extreme ultraviolet (XUV) pulses from solid-state HHG. Then, we discuss their current and potential usage in time-resolved study of electron and nuclear dynamics in atomic, molecular and condensed matters. T abletop attosecond light sources in the soft X-ray (SXR) spectral region based on highharmonic generation are highly desirable in chemical and material sciences since they can spectroscopically identify specific elements, as well as the oxidation states, charge states and even the spin states of those elements 1. One of the important spectral regions is the "water window" (282-533 eV), which covers the atomic K-shell excitation of carbon and oxygen. Although high harmonics in the water window were first generated with Ti:Sapphire lasers centered at 800 nm more than 20 years ago 2,3 , the X-ray photon flux was too low for timeresolved applications. The mechanism of HHG in gases can be explained by the semiclassical three-step model 4-6. When driving laser-field strength reaches~10 8 V m −1 , the bound electron in the atomic gas can tunnel through the Coulomb potential barrier and become a free electron. In the oscillating laser field, the free-electron wave packet may return to its parent ion with the right time of birth. At recombination, the interference between the wave packets of the returning and bound electrons produces an oscillating dipole that emits attosecond radiation. Returning electrons with various kinetic energy will recombine at different times giving rise to the chirp in the attosecond radiation 7. This process repeats twice for every optical cycle. The temporal beating of attosecond pulses results in the high-harmonic combs in the spectral domain. Empowered by the advances in driving lasers with center wavelengths around 1.8 μm, soft X-ray high harmonics can be generated with a moderate intensity of 10 14 W cm −2 (see Box 1 for details). Significant progress has recently been made in developing attosecond light within the water window 8. By spectrally broadening pulses from an Optical Parametric Amplifier (OPA) using a gas-filled hollow-core fiber 9 or by broadband phase matching in an Optical Parametric Chirped Pulse Amplifier (OPCPA) 10 , two-cycle, mJ-level pulses centered with 1 kHz repetition

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Section: Isolated Water Window X-ray Attosecond Pulsesmentioning

confidence: 99%

Section: Isolated Water Window X-ray Attosecond Pulsesmentioning

confidence: 99%

Attosecond science based on high harmonic generation from gases and solids

Li¹,

Lu²,

Chew³

et al. 2020

Nat Commun

Self Cite

220

126

View full text Add to dashboard Cite

show abstract

“…Recently, attosecond X-ray pulses reaching the carbon K-edge (282 eV) have been produced by driving high harmonic generation with short-wave infrared lasers [ 12 , 13 , 14 , 15 ]. To generate single isolated attosecond pulses, various gating techniques [ 16 , 17 ] and chirp compensation methods [ 18 , 19 ] have been developed. Some of them have been implemented in generating isolated water window X-ray pulses around 50-attosecond pulse width [ 12 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Argon L-Shell Auger Decay Using 250-eV Attosecond X-ray Pulses

Han

Zhao

Chang

2022

Sensors

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Electron correlation describes the interaction between electrons in a multi-electron system. It plays an important role in determining the speed of relaxation of atoms and molecules excited by XUV/X-ray pulses, such as the argon decay rate. Most research on electron correlation has centered on the role of correlation in stationary states. A time-resolved experimental study of electron correlation is a grand challenge due to the required temporal resolution and photon energy. In this research, we investigated Auger decay in argon using 200-attosecond X-ray pulses reaching the carbon K-edge. At such a high photon energy, ionization occurs not only from the outer most levels (3s and 3p), but also from the 2p core shells. We have measured a lifetime of 4.9 fs of L-shell vacancies of argon in pump–probe experiments with a home-built high-resolution time-of-flight spectrometer.

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“…In the pioneer research, the dispersion of various materials are investigated in the XUV region, [26] and near Fourier transform limited pulses can be obtained with Xe [26] or Sn [27,28] as the dispersion compensation material for the spectral window of 150-300 eV. Hydrogen plasma [29] and neutral hydrogen [30] are proposed to be capable of compensating the atto-chirp in 300-500 eV and 500-1000 eV, respectively, which benefits the IAP generation with MIR drivers. With 800 nm driving pulses, the shortest IAP reported so far was 67 as, [5] and Zr foil was employed as the compensation material.…”

mentioning

confidence: 99%

Chirp Compensation for Generating Ultrashort Attosecond Pulses with 800-nm Few-Cycle Pulses

Wang 王,

Xiao 肖

et al. 2023

Chinese Phys. Lett.

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We show that it is feasible to generate sub-40-attosecond pulses with near-infrared few-cycle pulses centered at 800 nm. With proper gating technique, super-broadband continuum spectrum extending from 50 eV to above 200 eV can be obtained, and the intrinsic atto-chirp can be satisfactorily compensated with C filter, producing isolated attosecond pulses with duration of 33 as. According to the wavelength scaling law of high-order harmonic generation, the proposed scheme is of great significance to develop high-flux ultrashort attosecond sources.

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Compensating chirp of attosecond X-ray pulses by a neutral hydrogen gas

Cited by 6 publications

References 15 publications

Attosecond science based on high harmonic generation from gases and solids

Attosecond science based on high harmonic generation from gases and solids

Monitoring Argon L-Shell Auger Decay Using 250-eV Attosecond X-ray Pulses

Chirp Compensation for Generating Ultrashort Attosecond Pulses with 800-nm Few-Cycle Pulses

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