Controlled energy deposition and void-like modification inside transparent solids by two-color tightly focused femtosecond laser pulses

Potemkin, F. V.; Mareev, E. I.; Bezsudnova, Yulia; Platonenko, V. T.; Bravy, B. G.; Gordienko, Vyacheslav M

doi:10.1063/1.4981203

Cited by 23 publications

(17 citation statements)

References 11 publications

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“…The decrease of the efficiency of the laser induced post effects is caused by the increase of the area of the laser impact whereas the energy conserved in the electron plasma remains virtually unchanged. Thereby the deposited energy density drops [27]. From the viewpoint of practical use, the most preferred mode of LIFT is working at the laser energies close to the threshold energies of shock wave generation.…”

Section: Figurementioning

confidence: 99%

Evolution of Shock-Induced Pressure in Laser Bioprinting

et al. 2021

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Laser bioprinting with gel microdroplets that contain living cells is a promising method for use in microbiology, biotechnology, and medicine. Laser engineering of microbial systems (LEMS) technology by laser-induced forward transfer (LIFT) is highly effective in isolating difficult-to-cultivate and uncultured microorganisms, which are essential for modern bioscience. In LEMS the transfer of a microdroplet of a gel substrate containing living cell occurs due to the rapid heating under the tight focusing of a nanosecond infrared laser pulse onto thin metal film with the substrate layer. During laser transfer, living organisms are affected by temperature and pressure jumps, high dynamic loads, and several others. The study of these factors’ role is important both for improving laser printing technology itself and from a purely theoretical point of view in relation to understanding the mechanisms of LEMS action. This article presents the results of an experimental study of bubbles, gel jets, and shock waves arising in liquid media during nanosecond laser heating of a Ti film obtained using time-resolving shadow microscopy. Estimates of the pressure jumps experienced by microorganisms in the process of laser transfer are performed: in the operating range of laser energies for bioprinting LEMS technology, pressure jumps near the absorbing film of the donor plate is about 30 MPa. The efficiency of laser pulse energy conversion to mechanical post-effects is about 10%. The estimates obtained are of great importance for microbiology, biotechnology, and medicine, particularly for improving the technologies related to laser bioprinting and the laser engineering of microbial systems.

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Section: Figurementioning

confidence: 99%

Evolution of Shock-Induced Pressure in Laser Bioprinting

et al. 2021

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“…However, the dynamics of the phase transition were not investigated. In experiments, the multi-megabar pressures are usually achieved by high-intensity, ultrashort laser pulses [28][29][30]. For example, by combining a free-electron-laser (FEL)-based X-ray-diffraction geometry with laser-driven compression, the lowering of the hydrostatic phase boundary in elemental silicon was demonstrated [4].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Ultrafast Phase Transitions in (001) Si on the Shock-Wave Front

Mareev

Potemkin

2022

IJMS

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We demonstrate an ultrafast (<0.1 ps) reversible phase transition in silicon (Si) under ultrafast pressure loading using molecular dynamics. Si changes its structure from cubic diamond to β-Sn on the shock-wave front. The phase transition occurs when the shock-wave pressure exceeds 11 GPa. Atomic volume, centrosymmetry, and the X-ray-diffraction spectrum were revealed as effective indicators of phase-transition dynamics. The latter, being registered in actual experimental conditions, constitutes a breakthrough in the path towards simple X-ray optical cross-correlation and pump-probe experiments.

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“…The femtosecond duration of the laser pulse allows to strongly localize the effect, thereby opening the way for new femtotechnologies for three-dimensional micro- and nano-processing of the bulk of various materials, competing with expensive and proven methods of electron lithography 1 . Furthermore, tight focusing of femtosecond low-energy (up to 10 μJ) laser radiation into the volume of a condensed medium creates the extreme states of matter that occur in stars and can thus be observed in laboratory conditions 2 .…”

Section: Introductionmentioning

confidence: 99%

“…These processes occur on a wide time scale from femtoseconds to microseconds, and the final state strongly depends on the features of structural rearrangements in the substance at each of the time stages 4 , 5 . Understanding microscopic processes in materials and devices that can be switched by light requires experimental access to dynamics on nanometer length and femtosecond time scales that enable new paths to material processing 2 , phase transitions 6 , 7 , and material properties manipulations 8 , 9 . The extreme impact of the laser pulse on the matter induces phase transitions that change its structural and physical properties 4 , 10 .…”

Section: Introductionmentioning

confidence: 99%

Dynamics of ultrafast phase transitions in MgF2 triggered by laser-induced THz coherent phonons

Mareev

Potemkin

2022

Sci Rep

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The advent of free-electron lasers opens new routes for experimental high-pressure physics, which allows studying dynamics of condensed matter with femtosecond resolution. A rapid compression, that can be caused by laser-induced shock impact, leads to the cascade of high-pressure phase transitions. Despite many decades of study, a complete understanding of the lattice response to such a compression remains elusive. Moreover, in the dynamical case (in contrast to quasi-static loading) the thresholds of phase transitions can change significantly. Using the third harmonic pump–probe technique combined with molecular dynamics to simulate the terahertz (THz) spectrum, we revealed the dynamics of ultrafast laser-induced phase transitions in MgF2 in all-optical experiment. Tight focusing of femtosecond laser pulse into the transparent medium leads to the generation of sub-TPa shock waves and THz coherent phonons. The laser-induced shock wave propagation drastically displaces atoms in the lattice, which leads to phase transitions. We registered a cascade of ultrafast laser-induced phase transitions (P42/mnm ⇒ Pa-3 ⇒ Pnam) in magnesium fluoride as a change in the spectrum of coherent phonons. The phase transition has the characteristic time of 5–10 ps, and the lifetime of each phase is on the order of 40–60 ps. In addition, phonon density of states, simulated by molecular dynamics, together with third-harmonic time-resolved spectra prove that laser-excited phonons in a bulk of dielectrics are generated by displacive excitation (DECP) mechanism in plasma mediated conditions.

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Controlled energy deposition and void-like modification inside transparent solids by two-color tightly focused femtosecond laser pulses

Cited by 23 publications

References 11 publications

Evolution of Shock-Induced Pressure in Laser Bioprinting

Evolution of Shock-Induced Pressure in Laser Bioprinting

Dynamics of Ultrafast Phase Transitions in (001) Si on the Shock-Wave Front

Dynamics of ultrafast phase transitions in MgF2 triggered by laser-induced THz coherent phonons

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