Ultrabroadband microwave radiation from near- and mid-infrared laser-produced plasmas in air

Englesbe, Alexander; Elle, Jennifer; Schwartz, R.; Garrett, Travis; Woodbury, Daniel; Jang, Dogeun; Kim, Ki-Yong; Milchberg, H. M.; Reid, Remington; Lucero, Adrian; Gordon, Daniel; Phillips, Ryan; Kalmykov, Serguei Y.; Schmitt-Sody, Andreas

doi:10.1103/physreva.104.013107

Cited by 12 publications

(4 citation statements)

References 46 publications

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“…Frequencies above 2 GHz were observed by interaction of ultrashort laser pulses with a pre-plasma or solid targets [19,57,58]. Although a significant part of the EMP stems from the bunch of electrons ejected from the target and to the discharge current through the target support, another part can come from the expanding plasma, as can be recognise from the EMP produced by laser interaction with gaseous targets [10,[59][60][61]. Although conditions for generation of EMP by interaction of laser pulses with solid and gaseous targets are different, EMP frequency spectrums have a similar range.…”

Section: Diagnostics Of Return Target Current At High Laser Intensitymentioning

confidence: 99%

“…One of the most significant and potential applications of high-power lasers pertains to the generation of plasma by focusing laser radiation on solid, liquid, or gaseous targets [1][2][3][4][5][6][7][8][9][10]. These plasmas have unique and versatile applications, depending on the laser power, focused intensities, and target parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, this allows the laser-produced plasmas to be used as secondary sources of electrons, ions, and various fusion products, as well as optical to gamma-ray radiation. One of their common features is the emission of electromagnetic pulses (EMPs) in the range from radio (MHz) to terahertz (THz) frequencies [10,[16][17][18]. These EMPs are considered a threat to electronic equipment, including the computer and detector devices, and have prompted the development of various protective measures [10,17,19].…”

Section: Introductionmentioning

confidence: 99%

“…One of their common features is the emission of electromagnetic pulses (EMPs) in the range from radio (MHz) to terahertz (THz) frequencies [10,[16][17][18]. These EMPs are considered a threat to electronic equipment, including the computer and detector devices, and have prompted the development of various protective measures [10,17,19]. Detection methods of EMP and mitigation of their adverse effects are also in the forefront of interest.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Diagnostics of Electrons Escaping from Laser-Produced Plasma

Krása,

Krupka,

Agarwal

et al. 2024

Plasma

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This article provides an up-to-date overview of the problems associated with the detection of hot electrons escaping from laser-produced plasma and corresponding return current flowing from the ground to the target, which neutralises the positive charge occurring on the target due to the escaped electrons. In addition, the target holder system acts as an antenna emitting an electromagnetic pulse (EMP), which is powered by the return target. If the amount of positive charge generated on the target is equal to the amount of charge carried away from the plasma by the escaping electrons, the measurement of the return current makes it possible to determine this charge, and thus also the number of escaped electrons. Methods of return current detection in the mA–10 kA range is presented, and the corresponding charge is compared to the charge determined using calibrated magnetic electron energy analysers. The influence of grounded and insulated targets on the number of escaped electrons and EMP intensity is discussed. In addition to EMP detection, mapping of the electrical potential near the target is mentioned.

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Section: Diagnostics Of Return Target Current At High Laser Intensitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Advanced Diagnostics of Electrons Escaping from Laser-Produced Plasma

Krása,

Krupka,

Agarwal

et al. 2024

Plasma

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Long distance laser filamentation using Yb:YAG kHz laser

Walch,

Mahieu,

Moreno

et al. 2023

Sci Rep

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In the framework of the Laser Lightning Rod project, whose aim is to show that laser-induced filaments can guide lightning discharges over considerable distances, we study over a distance of 140 m the filaments created by a laser system with J-range pulses of 1 ps duration at 1 kHz repetition rate. We investigate the spatial evolution of the multiple filamentation regime using the fundamental beam at 1030 nm or using combination with the second and third harmonics. The measurements were made using both a collimated beam and a loosely focused beam.

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Boosting radio frequency radiation with collisional processes in picosecond laser filamentation

Thornton,

Garrett,

Elle

2024

Physics of Plasmas

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When focused in air, ultrashort pulse lasers generate a plasma that produces ultrabroadband radio frequency (RF) radiation via both ponderomotive and plasma wake field current mechanisms. We have performed experiments with high energy pulses and pulse durations up to 5 ps, while holding the power constant. These longer pulses drive much higher electron densities and temperatures, especially as collisional processes become important, and we in turn have measured substantially increased RF generation. We have also developed a Drude numerical model of the ionization within the laser pulse, the heating due to collisions, and the ensuing current density evolution. We find that the low frequency scaling of the simulated current matches the experimental data, which indicates that the ponderomotive currents dominate the RF generation for these atmospheric pressure plasmas. However, the experimentally measured spectra also show an additional low frequency (1–10 GHz) component that grows with laser pulse length, which is consistent with the plasma wake surface wave RF also becoming important as the plasma temperature approaches 100 eV.

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Ultrabroadband microwave radiation from near- and mid-infrared laser-produced plasmas in air

Cited by 12 publications

References 46 publications

Advanced Diagnostics of Electrons Escaping from Laser-Produced Plasma

Advanced Diagnostics of Electrons Escaping from Laser-Produced Plasma

Long distance laser filamentation using Yb:YAG kHz laser

Boosting radio frequency radiation with collisional processes in picosecond laser filamentation

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