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M. Pascolini

Bio: M. Pascolini is an academic researcher from University of Padua. The author has contributed to research in topics: High harmonic generation & Phase (waves). The author has an hindex of 15, co-authored 35 publications receiving 900 citations.

Papers
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Journal ArticleDOI
TL;DR: For the first time single-shot harmonic spectra generated by few-optical-cycle pulses have been measured and clear carrier-envelope phase effects have been observed in the cutoff harmonic spectral structure.
Abstract: For the first time single-shot harmonic spectra generated by few-optical-cycle pulses have been measured. Clear carrier-envelope phase effects have been observed in the cutoff harmonic spectral structure. Results have been interpreted in terms of the nonadiabatic single-atom response of the nonlinear medium excited by few-optical-cycle pulses.

142 citations

Journal ArticleDOI
TL;DR: In this article, the authors focused on the sol−gel synthesis of rare-earth-doped zinc oxide, highlighting the crucial points involved in the design and development of ZnO/Eu nanosystems with peculiar and easily tunable photophysical properties.
Abstract: The present study, focused on the sol−gel synthesis of rare-earth-doped zinc oxide, highlights the crucial points involved in the design and development of ZnO/Eu nanosystems with peculiar and easily tunable photophysical properties. ZnO nanopowders containing different europium amounts were prepared starting from zinc and europium acetate salts as the sol precursors. The densification process and the evolution of the structural−optical properties were studied as a function of annealing performed in air between 100 and 1000 °C. The microstructure and composition of the samples and their dependence on the synthesis procedure were investigated by X-ray diffraction and X-ray photoelectron spectroscopy, whereas the emission properties were studied by photoluminescence spectroscopy in the energy and time domains as a function of the structural evolution. Crystalline ZnO powders in the wurtzite structure were formed after heat treatment at 400 °C, with an average nanocrystal size of ca. 20 nm. Stronger annealin...

121 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated high-order harmonic generation in argon driven by 25-fs-light pulses from the gaseous to the cluster regime, showing the existence of an optimal cluster dimension, which maximizes the harmonic photon yield.
Abstract: High-order harmonic generation in argon driven by 25-fs-light pulses is investigated from the gaseous to the cluster regime. The harmonic cutoff observed in presence of clusters shows a considerable extension with respect to the gaseous phase. Harmonic spectra are investigated as a function of cluster size, showing the existence of an optimal cluster dimension, which maximizes the harmonic photon yield.

100 citations

Journal ArticleDOI
TL;DR: Low-divergence, high-brightness harmonic emission has been generated by using a fundamental beam with a truncated Bessel intensity profile using the hollow-fiber compression technique, which allows one to optimize both temporal and spatial characteristics of the high-order harmonic generation process.
Abstract: Low-divergence, high-brightness harmonic emission has been generated by using a fundamental beam with a truncated Bessel intensity profile. Such a beam is directly obtained by using the hollow-fiber compression technique, which indeed allows one to optimize both temporal and spatial characteristics of the high-order harmonic generation process. This is particularly important for the applications of radiation, where extreme temporal resolution and high brightness are required.

74 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of carrier-envelope phase of a multi-optical-cycle light pulse on high-order harmonic generation has been investigated both experimentally and theoretically.
Abstract: So far the role of the carrier-envelope phase of a light pulse has been clearly experimentally evidenced only in the sub-6-fs temporal regime Here we show, both experimentally and theoretically, the influence of the carrier-envelope phase of a multi-optical-cycle light pulse on high-order harmonic generation For the first time, we demonstrate that the short and long electron quantum paths contributing to harmonic generation are influenced in a different way by the pulse carrier-envelope phase

64 citations


Cited by
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Proceedings Article
Ferenc Krausz1
01 Aug 2007
TL;DR: In this paper, an attosecond "oscilloscope" was used to visualize the oscillating electric field of visible light with an oscillator and probe multi-electron dynamics in atoms, molecules and solids.
Abstract: Summary form only given. Fundamental processes in atoms, molecules, as well as condensed matter are triggered or mediated by the motion of electrons inside or between atoms. Electronic dynamics on atomic length scales tends to unfold within tens to thousands of attoseconds (1 attosecond [as] = 10-18 s). Recent breakthroughs in laser science are now opening the door to watching and controlling these hitherto inaccessible microscopic dynamics. The key to accessing the attosecond time domain is the control of the electric field of (visible) light, which varies its strength and direction within less than a femtosecond (1 femtosecond = 1000 attoseconds). Atoms exposed to a few oscillations cycles of intense laser light are able to emit a single extreme ultraviolet (XUV) burst lasting less than one femtosecond. Full control of the evolution of the electromagnetic field in laser pulses comprising a few wave cycles have recently allowed the reproducible generation and measurement of isolated sub-femtosecond XUV pulses, demonstrating the control of microscopic processes (electron motion and photon emission) on an attosecond time scale. These tools have enabled us to visualize the oscillating electric field of visible light with an attosecond "oscilloscope", to control single-electron and probe multi-electron dynamics in atoms, molecules and solids. Recent experiments hold promise for the development of an attosecond X-ray source, which may pave the way towards 4D electron imaging with sub-atomic resolution in space and time.

1,618 citations

Journal ArticleDOI
TL;DR: In this paper, the authors make corrections to three equations in the above article and see the PDF file for full details of the corrections. But they do not make any changes to the equations themselves.
Abstract: We would like to make corrections to three equations in the above article Please see the PDF file for full details

701 citations

Journal ArticleDOI
17 Oct 2014-Science
TL;DR: The application of isolated attosecond pulses to prompt ionization of the amino acid phenylalanine and the subsequent detection of ultrafast dynamics on a sub–4.5-femtosecond temporal scale, which is shorter than the vibrational response of the molecule.
Abstract: In the past decade, attosecond technology has opened up the investigation of ultrafast electronic processes in atoms, simple molecules, and solids. Here, we report the application of isolated attosecond pulses to prompt ionization of the amino acid phenylalanine and the subsequent detection of ultrafast dynamics on a sub–4.5-femtosecond temporal scale, which is shorter than the vibrational response of the molecule. The ability to initiate and observe such electronic dynamics in polyatomic molecules represents a crucial step forward in attosecond science, which is progressively moving toward the investigation of more and more complex systems.

651 citations

Journal ArticleDOI
TL;DR: The theoretical description and experimental methods and results for above-threshold ionization (ATI) by few-cycle pulses are reviewed in this article, where a pulse is referred to as a fewcycle pulse if its detailed shape, parametrized by its carrier-envelope phase, affects its interaction with matter.
Abstract: The theoretical description and the experimental methods and results for above-threshold ionization (ATI) by few-cycle pulses are reviewed. A pulse is referred to as a few-cycle pulse if its detailed shape, parametrized by its carrier-envelope phase, affects its interaction with matter. Angular-resolved ATI spectra are analysed with the customary strong-field approximation (SFA) as well as the numerical solution of the time-dependent Schrodinger equation (TDSE). After a general discussion of the characteristics and the description of few-cycle pulses, the behaviour of the ATI spectrum under spatial inversion is related to the shape of the laser field. The ATI spectrum both for the direct and for the rescattered electrons in the context of the SFA is evaluated by numerical integration and by the method of steepest descent (saddle-point integration), and the results are compared. The saddle-point method is modified to avoid the singularity of the dipole transition matrix element at the steepest-descent times. With the help of the saddle-point method and its classical limit, namely the simple-man model, the various features of the ATI spectrum, their behaviour under inversion, the cut-offs and the presence or absence of ATI peaks are analysed as a function of the carrier-envelope phase of the few-cycle laser field. All features observed in the spectra can be explained in terms of a few quantum orbits and their superposition. The validity of the SFA and the concept of quantum orbits are established by comparing the ATI spectra with those obtained numerically from the ab initio solution of the TDSE.

515 citations

Journal ArticleDOI
TL;DR: ZnO nanostructures have shown the binding of biomolecules in desired orientations with improved conformation and high biological activity, resulting in enhanced sensing characteristics, and compatibility with complementary metal oxide semiconductor technology for constructing integrated circuits makes ZnO Nanostructure suitable candidate for future small integrated biosensor devices.

512 citations