Detection of microwave emission from solid targets ablated with an ultrashort pulsed laser

Miragliotta, Joseph A.; Brawley, Benjamin; Sailor, Caroline; Spicer, James B.; Spicer, J. W. M.

doi:10.1117/12.884003

Cited by 11 publications

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“…A maximum electric field of 261 kV/m was measured, about two orders of magnitude higher than previous measurements in nanosecond lasers with much higher energy (LULI, OMEGA and NIF68101213182021), and comparable with maximum values reached with picosecond lasers182021.…”

Section: Discussionmentioning

confidence: 40%

“…The generation of transient fields of very high intensity in the radiofrequency-microwave regime has been observed for femtosecond to nanosecond laser pulses with 10 11 –10 20 W/cm 2 intensity, on both conductive and dielectric targets3456789101112131415161718192021. These fields have a bandwidth of several GHz and last for hundreds of nanoseconds.…”

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confidence: 99%

“…EMPs have been previously characterized with conductive probes3456789101112131415161718192021, but only a few works specifically address the absolute measurements of the associated electric fields, which are accomplished by D-dot and B-dot probes (sensitive to and respectively)2526. This is mainly due to the difficulties in performing reliable measurements with suitable signal-to-noise ratio (SNR).…”

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confidence: 99%

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Time-resolved absolute measurements by electro-optic effect of giant electromagnetic pulses due to laser-plasma interaction in nanosecond regime

Consoli

Angelis

Duvillaret

et al. 2016

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We describe the first electro-optical absolute measurements of electromagnetic pulses (EMPs) generated by laser-plasma interaction in nanosecond regime. Laser intensities are inertial-confinement-fusion (ICF) relevant and wavelength is 1054 nm. These are the first direct EMP amplitude measurements with the detector rather close and in direct view of the plasma. A maximum field of 261 kV/m was measured, two orders of magnitude higher than previous measurements by conductive probes on nanosecond regime lasers with much higher energy. The analysis of measurements and of particle-in-cell simulations indicates that signals match the emission of charged particles detected in the same experiment, and suggests that anisotropic particle emission from target, X-ray photoionization and charge implantation on surfaces directly exposed to plasma, could be important EMP contributions. Significant information achieved on EMP features and sources is crucial for future plants of laser-plasma acceleration and inertial-confinement-fusion and for the use as effective plasma diagnostics. It also opens to remarkable applications of laser-plasma interaction as intense source of RF-microwaves for studies on materials and devices, EMP-radiation-hardening and electromagnetic compatibility. The demonstrated extreme effectivity of electric-fields detection in laser-plasma context by electro-optic effect, leads to great potential for characterization of laser-plasma interaction and generated Terahertz radiation.

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Section: Discussionmentioning

confidence: 40%

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confidence: 99%

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confidence: 99%

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Time-resolved absolute measurements by electro-optic effect of giant electromagnetic pulses due to laser-plasma interaction in nanosecond regime

Consoli

Angelis

Duvillaret

et al. 2016

Sci Rep

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“…We have previously measured magnitude, directionality, and polarization of EMP (10 GHz) due to a 40 fs, 800-nm pulse focused in atmosphere at 25-cm range onto several metals, semiconductors, and dielectric targets. 15 In this current investigation, we further examine the enhancement of ultrashort laser-induced EMP observed in Ref. 16.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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Abstract. In a previous report, we have shown that the long wavelength, electromagnetic-pulsed (EMP) energy generated by ultrashort (38 fs) laser pulse ablation of a metal target is enhanced by an order of magnitude due to a preplasma generated by a different, 14-ns-long laser pulse. Here, we further investigate this EMP enhancement effect in a 2-to 16-GHz microwave region with different target materials and laser parameters. Specifically, we show a greater than two orders of magnitude enhancement to the EMP energy when the nanosecond and ultrashort laser pulses are coincident on a glass target, and greater than one order of magnitude enhancement when the pulses are coincident on a copper target.

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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).…”

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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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Detection of microwave emission from solid targets ablated with an ultrashort pulsed laser

Cited by 11 publications

References 0 publications

Time-resolved absolute measurements by electro-optic effect of giant electromagnetic pulses due to laser-plasma interaction in nanosecond regime

Time-resolved absolute measurements by electro-optic effect of giant electromagnetic pulses due to laser-plasma interaction in nanosecond regime

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

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

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