Spatio-temporal modification of femtosecond focal spot under tight focusing condition

Jeong, Tae Moon; Weber, Stefan; Garrec, B. Le; Margarone, D.; Mocek, Tomáš; Korn, G.

doi:10.1364/oe.23.011641

Cited by 36 publications

(29 citation statements)

References 19 publications

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“…Also, note that the paraxial approximation starts to fail in the high-NA operating conditions of the EPM. In this case, and for our laser parameters, the peak intensity of the longitudinal laser electric field at the second focus of the ellipsoid reaches ∼10% of that of the transverse laser electric field 52 .…”

Section: Methodsmentioning

confidence: 61%

“…The experiments investigating proton acceleration from solid targets at high laser intensities were performed at the Laboratoire pour l’Utilisation des Lasers Intenses (LULI, France) and Sandia National Laboratory (SNL, NM, USA). Both employed either direct irradiation of the targets positioned at the laser focus, or refocusing of the laser by an ellipsoidal plasma mirror (EPM) 31 , 40 , 52 . In the first case, the laser is focused using an f /2.7 off-axis-parabolic (OAP) focusing mirror at LULI ( f /4 at SNL) to a 4.4 ± 0.5 μm (8 ± 0.5 μm at SNL) full-width at half-maximum (FWHM) spot.…”

Section: Methodsmentioning

confidence: 99%

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Self-generated surface magnetic fields inhibit laser-driven sheath acceleration of high-energy protons

et al. 2018

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High-intensity lasers interacting with solid foils produce copious numbers of relativistic electrons, which in turn create strong sheath electric fields around the target. The proton beams accelerated in such fields have remarkable properties, enabling ultrafast radiography of plasma phenomena or isochoric heating of dense materials. In view of longer-term multidisciplinary purposes (e.g., spallation neutron sources or cancer therapy), the current challenge is to achieve proton energies well in excess of 100 MeV, which is commonly thought to be possible by raising the on-target laser intensity. Here we present experimental and numerical results demonstrating that magnetostatic fields self-generated on the target surface may pose a fundamental limit to sheath-driven ion acceleration for high enough laser intensities. Those fields can be strong enough (~10 5 T at laser intensities ~10 21 W cm –2 ) to magnetize the sheath electrons and deflect protons off the accelerating region, hence degrading the maximum energy the latter can acquire.

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Section: Methodsmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Self-generated surface magnetic fields inhibit laser-driven sheath acceleration of high-energy protons

et al. 2018

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“…It also shows the expected parameters achievable with the 10 PW beam at ELI Beamlines. In preparation for such experiments, preliminary test-experiments are planned on existing facilities which provide pulse durations of the order of $ 100 fs and at the same time theoretical tools are being developed to model the beam parameters under tight focus [128,129].…”

Section: Plasma-based Tight Focusingmentioning

confidence: 99%

P3: An installation for high-energy density plasma physics and ultra-high intensity laser–matter interaction at ELI-Beamlines

Weber

Bechet

Borneis

et al. 2017

Matter and Radiation at Extremes

133

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ELI-Beamlines (ELI-BL), one of the three pillars of the Extreme Light Infrastructure endeavour, will be in a unique position to perform research in high-energy-density-physics (HEDP), plasma physics and ultra-high intensity (UHI) (1022W/cm2) laser–plasma interaction. Recently the need for HED laboratory physics was identified and the P3 (plasma physics platform) installation under construction in ELI-BL will be an answer. The ELI-BL 10 PW laser makes possible fundamental research topics from high-field physics to new extreme states of matter such as radiation-dominated ones, high-pressure quantum ones, warm dense matter (WDM) and ultra-relativistic plasmas. HEDP is of fundamental importance for research in the field of laboratory astrophysics and inertial confinement fusion (ICF). Reaching such extreme states of matter now and in the future will depend on the use of plasma optics for amplifying and focusing laser pulses. This article will present the relevant technological infrastructure being built in ELI-BL for HEDP and UHI, and gives a brief overview of some research under way in the field of UHI, laboratory astrophysics, ICF, WDM, and plasma optics.

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“…High Energy and Short Pulse Lasers (17) Here, d is the groove spacing of grating and θ ' is the diffraction angle. The first-order diffraction is only considered in this case.…”

Section: Stretching Of An Ultrashort Laser Pulse Before Amplificationmentioning

confidence: 99%

“…Recently, the intensity distributions of a focused fs high-power laser pulse under a tight focusing condition were intensively examined [17]. In this section, the intensity distributions of a tightly focused laser spot are described.…”

Section: Focusing Ultrashort Laser Pulsesmentioning

confidence: 99%

Generation of High-Intensity Laser Pulses and their Applications

Jeong¹,

Lee²

2016

High Energy and Short Pulse Lasers

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The progress in the laser technology makes it possible to produce a laser pulse having a peak power of over PW. Focusing such high-power laser pulses enables ones to have unprecedentedly strong laser intensity. The laser intensity over 10 19 W/cm 2 , which is called the relativistic laser intensity, can accelerate electrons almost to the speed of light. The acceleration of charged particles using such a high-power laser pulse has been successfully demonstrated in many experiments. According to the recent calculation using the vector diffraction theory, it is possible, by employing a tight focusing geometry, to produce a femtosecond (fs) laser focal spot to have an intensity of over 10 24 W/cm 2 in the focal plane. Over this laser intensity, protons can be directly accelerated almost to the speed of light. Such ultrashort and ultrastrong laser intensities will bring ones many opportunities to experimentally study ultrafast physical phenomena we have never met before. This chapter describes how to generate a high-power laser pulse. And, then the focusing characteristics of a femtosecond high-power laser pulse are discussed in the scalar and the vector diffraction limits. Finally, the applications of ultrashort high-power laser are briefly introduced.

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Spatio-temporal modification of femtosecond focal spot under tight focusing condition

Cited by 36 publications

References 19 publications

Self-generated surface magnetic fields inhibit laser-driven sheath acceleration of high-energy protons

Self-generated surface magnetic fields inhibit laser-driven sheath acceleration of high-energy protons

P3: An installation for high-energy density plasma physics and ultra-high intensity laser–matter interaction at ELI-Beamlines

Generation of High-Intensity Laser Pulses and their Applications

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