Plasma enhancement of femtosecond laser-induced electromagnetic pulses at metal and dielectric surfaces

Varma, S.; Spicer, J. W. M.; Brawley, Benjamin; Miragliotta, Joseph A.

doi:10.1117/1.oe.53.5.051515

Cited by 18 publications

(9 citation statements)

References 31 publications

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“…Summarizing, we performed measurements of the target neutralization current, the total target charge and the tangential component of the magnetic field of the resulting electromagnetic pulse for the laser energies ranging from 45 mJ to 92 mJ, with to pulse duration approximately 40 fs, and for the pulse durations ranging from 39 fs to 1000 fs, with the laser energy approximately 90 mJ. We found that values obtained for the 1 mm Cu target are visibly higher than values obtained in previous experiments [7,8] for the 3 mm Cu target, which we argue is a manifestation of a strong dependence on the laser contrast and hence on the amount of preplasma (the sensitivity of EMP to the presence of preplasma was noted in [16]). We also found that measurements for 6 µm Al foils give visibly higher results than for the thick Cu targets, which is especially true for pulse durations longer than 100 fs.…”

Section: Discussioncontrasting

confidence: 50%

Strong electromagnetic pulses generated in high-intensity laser-matter interactions

Ra̧czka

Dubois

Hulin

et al. 2018

J. Phys.: Conf. Ser.

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Results are reported of an experiment performed at the Eclipse laser facility in CELIA, Bordeaux, on the generation of strong electromagnetic pulses. Measurements were performed of the target neutralization current, the total target charge and the tangential component of the magnetic field for the laser energies ranging from 45 mJ to 92 mJ with the pulse duration approximately 40 fs, and for the pulse durations ranging from 39 fs to 1000 fs, with the laser energy approximately 90 mJ. It was found that the values obtained for thick (mm scale) Cu targets are visibly higher than values reported in previous experiments, which is argued to be a manifestation of a strong dependence of the target electric polarization process on the laser contrast and hence on the amount of preplasma. It was also found that values obtained for thin (µm scale) Al foils were visibly higher than values for thick Cu targets, especially for pulse durations longer than 100 fs. The correlations between the total target charge versus the maximum value of the target neutralization current, and the maximum value of the tangential component of the magnetic field versus the total target charge were analysed. They were found to be in very good agreement with correlations seen in data from previous experiments, which provides a good consistency check on our experimental procedures.

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Section: Discussioncontrasting

confidence: 50%

Strong electromagnetic pulses generated in high-intensity laser-matter interactions

Ra̧czka

Dubois

Hulin

et al. 2018

J. Phys.: Conf. Ser.

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“…Chen et al [8] reported the microwave emission generated by a laser pulse incident on a metallic disc surface had a frequency ranges from 0.5 GHz to 4 GHz. Moreover, the fs laser pulse inducing EMP can be enhanced by a long (ns) laser pulse due to the formation of pre-plasma [9].…”

Section: Photonic Sensors 250mentioning

confidence: 99%

Investigation into the electromagnetic impulses from long-pulse laser illuminating solid targets inside a laser facility

Yang

et al. 2016

Photonic Sens

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Emission of the electromagnetic pulses (EMP) due to laser-target interaction in laser facility had been evaluated using a cone antenna in this work. The microwave in frequencies ranging from several hundreds of MHz to 2 GHz was recorded when long-pulse lasers with several thousands of joules illuminated the solid targets, meanwhile the voltage signals from 1 V to 4 V were captured as functions of laser energy and backlight laser, where the corresponding electric field strengths were obtained by simulating the cone antenna in combination with conducting a mathematical process (Tiknohov Regularization with L curve). All the typical coupled voltage oscillations displayed multiple peaks and had duration of up to 80 ns before decaying into noise and mechanisms of the EMP generation was schematically interpreted in basis of the practical measuring environments. The resultant data were expected to offer basic know-how to achieve inertial confinement fusion.

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“…However, a complete quantitative understanding of this phenomenon is still lacking. The EMP effect continues to attract considerable attention and is now being investigated also with the use of smaller laser facilities (Aspiotis et al, 2006;Miragliotta et al, 2011; Consoli et al, 2013;Dubois et al, 2014;De Marco et al, 2014;Cikhardt et al, 2014;Varma et al, 2014; Poyé et al, 2015a; Poyé et al, 2015b;Price et al, 2015; Consoli et al, 2015aConsoli et al, , 2015b Consoli et al, , 2016 De Marco et al, 2016, 2017Yi et al, 2016;Robinson et al, 2017;Krása et al, 2017a). In particular, a series of recent articles (Dubois et al, 2014; Poyé et al, 2015a; Poyé et al, 2015b) concentrated on the effect of electromagnetic emission related to the target neutralization current, which is of pulsed nature and which appears as a consequence of the laser-induced electric polarization of the target (Pearlman & Dahlbacka, 1977;Benjamin et al, 1979;Beg et al, 2004;Quinn et al, 2009;Krása et al, 2015;Krása et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Strong electromagnetic pulses generated in high-intensity short-pulse laser interactions with thin foil targets

et al. 2017

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Measurements are reported of the target neutralization current, the target charge, and the tangential component of the magnetic field generated as a result of laser-target interaction by pulses with the energy in the range of 45 mJ to 92 mJ on target and the pulse duration from 39 fs to 1000 fs. The experiment was performed at the Eclipse facility in CELIA, Bordeaux. The aim of the experiment was to extend investigations performed for the thick (mm scale) targets to the case of thin (µm thickness) targets in a way that would allow for a straightforward comparison of the results. We found that thin foil targets tend to generate 20%-50% higher neutralization current and the target charge than the thick targets. The measurement of the tangential component of the magnetic field had shown that the initial spike is dominated by the 1 ns pulse consistent with the 1 ns pulse of the neutralization current, but there are some differences between targets of different type on sub-ns scale, which is an effect going beyond a simple picture of the target acting as an antenna. The sub-ns structure appears to be reproducible to surprising degree. We found that there is in general a linear correlation between the maximum value of the magnetic field and the maximum neutralization current, which supports the target-antenna picture, except for pulses 100's of fs long.Keywords: electromagnetic pulses, neutralization current, electric polarization of the target, */ Corresponding author: P. Rączka, Division of Laser Plasma, Institute of Plasma Physics and Laser Microfusion, ul. Hery 23, 01-497 Warsaw, Poland; tel. +48 22 6381005 ext. 20. 1.INTRODUCTIONOne of the characteristic effects observed in the experiments performed with the use of highenergy, high-intensity lasers is the appearance of strong electromagnetic pulses (EMP) with frequencies ranging from tens of MHz to multi-GHz. First accounts of the rf to microwave emission resulting from the laser-target interactions were published already in the seventies (Pearlman & Dahlbacka, 1978). With the advent of petawatt lasers and MJ laser facilities the issue of EMP became of considerable practical interest, because such pulses strongly interfere with the electronics used to collect data and manipulate targets and hence pose a serious threat to safe and reliable execution of experiments. Therefore a dedicated effort was made to study the EMP effect at facilities such as Vulcan, Titan, Omega, NIF, LMJ and other (Mead et al., 2004;Raimbourg, 2004;Stoeckl et al., 2006;Remo et al., 2007;Brown et al., 2008; Bourgade et al., 2008; Eder et al., 2009; Brown et al., 2010; Eder et al., 2010;Chen et al., 2011;Bateman & Mead, 2012;Brown et al., 2012;Brown et al., 2013;). Pulses of 100's ns duration and electric fields of 100's kV/m strength were recorded. Various EMP generation mechanisms had been considered at this stage, including the charge separation effects in laser plasmas and low-frequency oscillations of the expanding plasmas (Pearlman & Dahlbacka, 1978), the electron currents wit...

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Plasma enhancement of femtosecond laser-induced electromagnetic pulses at metal and dielectric surfaces

Cited by 18 publications

References 31 publications

Strong electromagnetic pulses generated in high-intensity laser-matter interactions

Strong electromagnetic pulses generated in high-intensity laser-matter interactions

Investigation into the electromagnetic impulses from long-pulse laser illuminating solid targets inside a laser facility

Strong electromagnetic pulses generated in high-intensity short-pulse laser interactions with thin foil targets

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