Spatial shaping of intense femtosecond beams for the generation of high-energy attosecond pulses

Constant, Éric; Dubrouil, A.; Hort, O.; Petit, S.; Descamps, D.; Mével, E.

doi:10.1088/0953-4075/45/7/074018

Cited by 16 publications

(19 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our detection method would give a way to check the uniformity of the generating process by monitoring the uniformity of the far-field spatially resolved spectra. The method could be coupled with spatial shaping techniques 15,51,52 to optimize the uniformity of the attosecond pulse in large volume and therefore to allow the production of clean attosecond pulses at high energy level. In addition to the spatial shaping technique, controlling the temporal shape of the pulse via ultrafast pulse shaper that can be integrated in the laser chain would open an excellent way to optimize the attosecond pulses.…”

Section: Discussionmentioning

confidence: 99%

Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

et al. 2014

View full text Add to dashboard Cite

A large international effort is nowadays devoted to increase the energy of the extreme ultraviolet pulses by using high-peak power ultrashort fundamental pulses (Terawatt level). Using such fundamental pulses brings specific constraints that need to be addressed. Here we study high-order harmonic generation in gases with 10 fs pulses at Terawatt peak power and demonstrate that extreme ultraviolet beams can be highly structured and complex in various conditions. We use a single-shot spatially resolved spectral detection and demonstrate direct observation of the spatio-temporal coupling occuring in the generating medium. Clear and reproducible complex spatio-spectral structures are observed in the far field. Similar structures are reproduced with simulations and we show that they are intimately associated to the high nonlinearity of high-order harmonic generation. Those findings are of prime importance for the generation of high-energy attosecond pulses and reveal important issues for their applications.

show abstract

Section: Discussionmentioning

confidence: 99%

Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

et al. 2014

View full text Add to dashboard Cite

show abstract

“…At the same time, as mentioned above, the eigenfunctions of the free atom and "an atom in the external field" eigenfunction problems are related to each other in a simple way, so we can expand the wave function of the TDSE into a series of the free atom eigenfunctions ψ⃗r; t X n a n tu n ⃗r; (9) and then use the relation equation (7). Omitting some evident details, we get the following set of equations for the probability amplitudes a n t:…”

Section: Basic Relations and Foundation Of The Methodsmentioning

confidence: 99%

“…Moreover, as long as the HHG is a visual nonlinear process, understanding of its origins has a fundamental interest. That is why the HHG process is actively studied both experimentally [5][6][7] and theoretically [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

High-order optical harmonic generation in ionization-free regime: origin of the process

2013

View full text Add to dashboard Cite

We present a new interpretation of high-order optical harmonic generation (HHG) in atomic gases interacting with laser fields. The mechanism of harmonic generation is due to the temporal evolution of the atomic electron density spatial distribution in the external laser field, and the integral energy of a high harmonic emission and an electron excitation is equal to the work executed by the laser field for an electron motion in the intra-atomic potential field. The proposed interpretation is based on the use of the basis of eigenfunctions of the boundary value problem for "an atom in the external field." As an illustration, we present the original results of computer simulations of an argon atom interaction with the two-color laser field formed by the fundamental and second harmonics of the Ti:sapphire laser.

show abstract

“…This profile was chosen because it has been wide used for material processing applications [3] and for high harmonic generation [29]. The LG expansion of the spatial top-hat profile of radius a is calculated at the focal plane considering s = f .…”

Section: Spatial Top-hat and Annular Ultrafast Beam Profilesmentioning

confidence: 99%

Femtosecond spatial pulse shaping at the focal plane

Martínez-Matos¹,

Vaveliuk²,

Izquierdo³

et al. 2013

Opt. Express

View full text Add to dashboard Cite

Abstract:Spatial shaping of ultrashort laser beams at the focal plane is theoretically analyzed. The description of the pulse is performed by its expansion in terms of Laguerre-Gaussian orthonormal modes. This procedure gives both a comprehensive interpretation of the propagation dynamics and the required signal to encode onto a spatial light modulator for spatial shaping, without using iterative algorithms. As an example, pulses with top-hat and annular spatial profiles are designed and their dynamics analyzed. The interference of top-hat pulses is also investigated finding potential applications in high precision pump-probe experiments (without using delay lines) and for the creation of subwavelength ablation patterns. In addition, a novel class of ultrashort pulses possessing non-stationary orbital angular momentum is also proposed. These exotic pulses provide additional degrees of freedom that open up new perspectives in fields such as laser-matter interaction and micro-machining.

show abstract

Spatial shaping of intense femtosecond beams for the generation of high-energy attosecond pulses

Cited by 16 publications

References 73 publications

Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

High-order optical harmonic generation in ionization-free regime: origin of the process

Femtosecond spatial pulse shaping at the focal plane

Contact Info

Product

Resources

About