Temporal stitching in burst-mode filamentation

Reyes, Danielle; Kerrigan, Haley; Pena, Jessica; Bodnar, Nathan; Bernath, Robert; Richardson, Martin; Fairchild, Shermineh Rostami

doi:10.1364/josab.36.000g52

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…Yet, only a few attempts were carried out to study filamentation phenomena in transparent materials using femtosecond pulse bursts. Burst-mode filamentation in atmospheric air enabled control and tailoring of filamentation dynamics 30 and production of extended conductive channels via filament stitching 31 , which are important for long-distance applications. Time-resolved dynamics of burst-mode filamentation-assisted micromachining of glasses revealed build-up of heat accumulation 6 , brighter and longer-lasting filament luminescence tracks 8 , demonstrating stronger laser-matter interaction and more prominent morphological changes of the solid-state material compared to a single pulse exposure.…”

Section: Introductionmentioning

confidence: 99%

Supercontinuum generation in bulk solid-state material with bursts of femtosecond laser pulses

Momgaudis,

Marčiulionytė,

Jukna

et al. 2024

Sci Rep

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We report on experimental and numerical investigation of burst-mode supercontinuum generation in sapphire crystal. The experiments were performed using bursts consisting of two 190 fs, 1030 nm pulses with intra-burst repetition rates of 62.5 MHz and 2.5 GHz from an amplified 1 MHz Yb:KGW laser and revealed higher filamentation and supercontinuum generation threshold for the second pulse in the burst, which increases with the increase of intra-burst repetition rate. The experimental results were quantitatively reproduced numerically, using a developed model, which accounted for altered material response due to residual excitations remaining after propagation of the first pulse. The simulation results unveiled that residual free electron plasma and self-trapped excitons contribute to elevated densities of free electron plasma generated by the second pulse in the burst and so stronger plasma defocusing, significantly affecting its nonlinear propagation dynamics. The presented results identify the fundamental and practical issues for supercontinuum generation in solid-state materials using femtosecond pulse bursts with very high intra-burst repetition rates, which may also apply to the case of single pulses at very high repetition rate, where residual material excitations become relevant and should be accounted for.

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Section: Introductionmentioning

confidence: 99%

Supercontinuum generation in bulk solid-state material with bursts of femtosecond laser pulses

Momgaudis,

Marčiulionytė,

Jukna

et al. 2024

Sci Rep

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“…A great amount of research has been focused on plasma filamentation in air by high intensity fs-range laser pulses 8,9 , or trains of these pulses [10][11][12] . With the laser pulse intensity of 10 18 -10 19 W/m 2 , the main mechanism of plasma formation was tunneling ionization of air molecules.…”

Section: Introductionmentioning

confidence: 99%

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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“…In these studies, the laser pulse duration was typically in the multi femtosecond to picosecond regime and the intensities high enough to induce tunneling ionization ( ) in air. Recent work has shown that multiple laser pulses can be generated and used to generate extended plasma filaments 13,14 . For example, 30 laser pulses of duration ~30 fs , separated by ~0.5 ns , and having a total energy of ~600 mJ , were used to generate plasma filaments in air 15 .…”

Section: Introductionmentioning

confidence: 99%

Low intensity laser pulse train propagation in air: part I: analysis and simulations

Blair,

Markov,

Sprangle

2023

Laser Communication and Propagation Through the Atmosphere and Oceans XII

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In this presentation we outline the results of the analysis and numerical simulations of the physical phenomena associated with the propagation of laser pulse trains (LPT) in air. In the performed studies the intensity of the micropulses in the LPT is far below that of tunneling ionization. The ionization process relies on the background level of radioactivity, which plays an important role in initiating a collisional ionization process. The focused LPT ionizes the air forming a plasma filament. The ponderomotive forces associated with the LPT drive the plasma oscillations predominantly in the radial direction. As the plasma density builds up on axis, the latter portion of the LPT is defocused, resulting in scattering of the incoming laser radiation and shortening of the laser's interaction length. In our model, a low intensity LPT photo-ionizes background negative ions (produced by ambient ionizing radiation) and provides the seed electrons necessary to initiate collisional ionization. The driven radial electron currents in turn generate directed rf radiation. The frequency of the rf radiation is given by 1/T p where T p is the separation time of micro-pulses in LPT.

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Temporal stitching in burst-mode filamentation

Cited by 12 publications

References 18 publications

Supercontinuum generation in bulk solid-state material with bursts of femtosecond laser pulses

Supercontinuum generation in bulk solid-state material with bursts of femtosecond laser pulses

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

Low intensity laser pulse train propagation in air: part I: analysis and simulations

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