Generation of RF Radiation by Laser Pulse Trains in Air

Blair, Gavin; Markov, Vladimir B.; Sprangle, P.

doi:10.1364/fio.2022.jtu4b.56

Cited by 1 publication

(6 citation statements)

References 7 publications

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“…The LPT profile carries an amplitude modulation at a frequency of 1.25 GHz that translates into a signature amplitude peak of the same frequency for the rf signal. Spectral data for the LPT and rf signals shown in Figure 10 are in a good agreement to the results of the analysis of LIP performed in the laser pulse train regime, published in 13,14 .…”

Section: Generation Of Rf Radiationsupporting

confidence: 85%

“…Here we compare the results of the experimental studies of LI-LPT interaction with air with the results of simulations and analysis discussed in 13,14 and in this volume 17 . The parameters of the LPT used for the analysis are listed in Table 1.…”

Section: Simulation Results and Comparison With Experimentsmentioning

confidence: 98%

“…The associated current density is highest near the temporal end of the LPT, where the electron density is high, and the space charge field is comparable to the ponderomotive field. Figure 13 shows a comparison of the simulated rf spectrum with an experimental spectrum 13,14,17 employing very similar LPT parameters to the ones used in our experiment. The experiment employed a LPT consisting of >30 micro-pulses with a micro-pulse separation of 𝑇 𝑝 = 650 ps.…”

Section: Simulation Results and Comparison With Experimentsmentioning

confidence: 99%

“…In contrast, our work focuses on generating plasma in air using a relatively low intensity LPT that gradually builds up the free electron density to form a plasma filament 13,14 . In this scenario the ionization process occurs at a much longer time scale and under quite different sets of parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Figure13shows a comparison of the simulated rf spectrum with an experimental spectrum13,14,17 employing very similar LPT parameters to the ones used in our experiment. The experiment employed a LPT consisting of >30 micro-pulses with a micro-pulse separation of 𝑇 𝑝 = 650 ps.…”

mentioning

confidence: 99%

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Low intensity laser pulse train propagation in air: part II: experimental studies

Markov,

Marienko,

Blair

et al. 2023

Laser Communication and Propagation Through the Atmosphere and Oceans XII

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This paper discusses the results of experimental studies of low intensity laser pulse train (LI-LPT) propagation in air. The train of ultra-short laser pulses of adjustable repetition rate became possible with the intra-cavity longitudinal mode selector that improves the efficiency of the mode locking mechanism. This technique enabled the generation of a LPT with an envelope duration TPL  40 ns (FWHM). The envelope is filled with a train of micro-pulses that form a temporal comb with an individual micro-pulse duration L  150 ps. The micro-pulse separation time, TP, can be tuned from ~10 ns to 0.45 ns. Depending on the pump level, the total energy ELPT of the LPT is in the range of 150 mJ and 1.2 J. When focused in air, the LPT with peak micro-pulse intensity ranging from 510 14 W/cm 2 to 10 16 W/cm 2 generates a plasma. The laser induced plasma leads to laser light scattering, broadband luminescence, and generation of rf radiation. We report the first results of the experimental studies of the interaction of the LI-LPT with air. Theoretical analysis and simulations of the filamentation and rf radiation have been carried out. The results of the experiment are in agreement with the theoretical and simulation results.

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Section: Generation Of Rf Radiationsupporting

confidence: 85%