Optimization of the wave front of high order harmonics

Gautier, J.; Zeitoun, Philippe; Hauri, Christoph P.; Morlens, Anne-Sophie; Rey, G.; Valentin, C.; Papalarazou, E.; Goddet, Jean-Philippe; Sebban, S.; Burgy, F.; Mercère, Pascal; Idir, Mourad; Dovillaire, Guillaume; Lévecq, Xavier; Bucourt, Samuel; Fajardo, M.; Merdji, H.; Caumes, Jean-Pascal

doi:10.1140/epjd/e2008-00123-2

Cited by 36 publications

(24 citation statements)

References 15 publications

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“…For example, applying an additional astigmatism onto the fundamental beam, we observed a lot more highorder aberrations on the harmonic beam, but no clear evidence for an additional astigmatism. This dependence differs from the results reported by Gautier et al [10] that astigmatism of the harmonics is influenced by the astigmatism of the fundamental laser. This difference might be due to the different target design, and further studies on this topic are necessary.…”

Section: Aberration Corrections With Phase Maskscontrasting

confidence: 99%

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Maximizing the brilliance of high-order harmonics in a gas jet

et al. 2009

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Section: Aberration Corrections With Phase Maskscontrasting

confidence: 99%

“…Most of the previous works on the optimization of harmonic sources have concentrated on the photon flux, the temporal evolution or the spectral shape [1]. Only very recently, there were first attempts to optimize the wave front of high-order harmonics [10].…”

Section: Introductionmentioning

confidence: 99%

Maximizing the brilliance of high-order harmonics in a gas jet

et al. 2009

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“…For experiments like plasma probing [7,13], holography [14], coherent diffraction imaging [12], and X-ray laser seeding [15], it is necessary to have spatially characterized and energy-optimized XUV pulses. Optimization in photon number and wavefront is achieved by adjusting the phase matching conditions of the different high-harmonic orders [16][17][18][19]. To take full advantage of the ultrafast resolution achievable with HHG, synchronization between the high-harmonics and pump pulse from the high power laser beam-line is crucial.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas

Koliyadu

Künzel²,

Wodzinski³

et al. 2017

Photonics

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Abstract:The creation of high energy density plasma states produced during laser-solid interaction on a sub-picosecond timescale opens a way to create astrophysical plasmas in the lab to investigate their properties, such as the frequency-dependent refractive index. Available probes to measure absorption and phase-changes given by the complex refractive index of the plasma state are extreme-UV (EUV) and soft X-ray (XUV) ultra-short pulses from high harmonic generation (HHG). For demanding imaging applications such as single-shot measurements of solid density plasmas, the HHG probe has to be optimized in photon number and characterized in intensity and wavefront stability from shot-to-shot. In an experiment, a coherent EUV source based on HHG driven by a compact diode-pumped laser is optimized in photons per pulse for argon and xenon, and the shot-to-shot intensity stability and wavefront changes are characterized. The experimental results are compared to an analytical model estimating the HHG yield, showing good agreement. The obtained values are compared to available data for solid density plasmas to confirm the feasibility of HHG as a probe.

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“…[13]. Due to the rather low conversion efficiency of the HHG process [14,15], the optimization of HHG in terms of brilliance-or number of photons per time interval imping-ing on a sample-has been an ongoing topic in the community [16][17][18][19]. The brilliance, or brightness, of a light source is the standard when comparing photon-producing elements, and is the benchmark especially when researching light-matter interactions with low rates or cross-sections.…”

Section: Introductionmentioning

confidence: 99%

Limitations of Extreme Nonlinear Ultrafast Nanophotonics

2015

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High-harmonic generation (HHG) has been established as an indispensable tool in optical spectroscopy. This effect arises for instance upon illumination of a noble gas with sub-picosecond laser pulses at focussed intensities significantly greater than 10 12 W/cm 2 . HHG provides a coherent light source in the extreme ultraviolet (XUV) spectral region, which is of importance in inner shell photo ionization of many atoms and molecules. Additionally, it intrinsically features light fields with unique temporal properties. Even in its simplest realization, XUV bursts of sub-femtosecond pulse lengths are released. More sophisticated schemes open the path to attosecond physics by offering single pulses of less than 100 attoseconds duration.Resonant optical antennas are important tools for coupling and enhancing electromagnetic fields on scales below their free-space wavelength. In a special application, placing field-enhancing plasmonic nano antennas at the interaction site of an HHG experiment has been claimed to boost local laser field strengths, from insufficient initial intensities to sufficient values. This was achieved with the use of arrays of bow-tie-shaped antennas of ∼ 100 nm in length. However, the feasibility of this concept depends on the vulnerability of these nano-antennas to the still intense driving laser light. We show, by looking at a set of exemplary metallic structures, that the threshold fluence F th of laser-induced damage (LID) is a greatly limiting factor for the proposed and tested schemes along these lines. We present our findings in the context of work done by other groups, giving an assessment of the feasibility and effectiveness of the proposed scheme.

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Optimization of the wave front of high order harmonics

Cited by 36 publications

References 15 publications

Maximizing the brilliance of high-order harmonics in a gas jet

Maximizing the brilliance of high-order harmonics in a gas jet

Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas

Limitations of Extreme Nonlinear Ultrafast Nanophotonics

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