Experimental and numerical investigations of double pulse laser energy deposition in air

Padhi, Upasana Priyadarshani; Singh, Awanish Pratap; Joarder, R. N.

doi:10.1016/j.ijheatfluidflow.2020.108563

Cited by 13 publications

(11 citation statements)

References 31 publications

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“…The time interval between the dual-optical pulses during laser ablation plays an important role in determining the degree of physical phenomena in target materials, such as environmental gas density, temperature, and shockwave [30,31]. In the case of intervals shorter than 20 μs, the first pulse typically generates and expands laser-induced plasma after the optical breakdown over the target surface, thus resulting in shockwave propagation [30][31][32]. As the gas density at the laser-irradiated spot is reduced, no additional pulse energy is delivered; in turn, this did not lead to ablation in the target (plasma shielding) [30,31].…”

Section: Discussionmentioning

confidence: 99%

“…In the case of intervals shorter than 20 μs, the first pulse typically generates and expands laser-induced plasma after the optical breakdown over the target surface, thus resulting in shockwave propagation [30][31][32]. As the gas density at the laser-irradiated spot is reduced, no additional pulse energy is delivered; in turn, this did not lead to ablation in the target (plasma shielding) [30,31]. Therefore, dual-optical pulses with time intervals shorter than 20 μs could be considered as a single pulse [33].…”

Section: Discussionmentioning

confidence: 99%

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Effect of dual‐optical pulses with temporal energy distribution on laser ablation performance in in vivo zebrafish model

Shin,

Lee,

Hwang

et al. 2023

Journal of Biophotonics

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A Q‐switched laser system has been used in a single‐pulse mode for skin melasma treatments because of instant heat deposition in the target. Despite the efficient ablation of the melanophores in the skin, the single, high‐fluence pulse often causes undesirable damage to the surrounding tissue, leading to high recurrence rates. This study aims to investigate the feasibility of dual‐optical pulses with a temporal energy distribution on the melasma treatment in in vivo zebrafish models in comparison to that of the single optical pulse. Based on the optical detection, the dual‐optical pulses had a temporal energy distribution ratio of 4:1 and an interval of 61 μs between the two consecutive pulses. According to the histological analysis, the dual pulses removed melanophores and induced a few apoptotic nuclei with minimal recurrence. This study demonstrated that the feasibility of dual‐optical pulses (energy ratio = 4:1) could enhance the laser ablation performance in vivo.This article is protected by copyright. All rights reserved.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of dual‐optical pulses with temporal energy distribution on laser ablation performance in in vivo zebrafish model

Shin,

Lee,

Hwang

et al. 2023

Journal of Biophotonics

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“…The simulation is performed in a Cartesian coordinate system in a two-dimensional framework considering thermal equilibrium and chemical non-equilibrium effects. The governing equations, numerical treatments and discretization techniques used in the present simulation are discussed by Padhi et al in [40].…”

Section: Numerical Simulation Showing Development Of Plamsa and Shok-...mentioning

confidence: 99%

“…The grid convergence study for the geometry used was previously carried out in [31]. The laser pulse is introduced instantaneously into the domain (the details of the numerical domain, laser discharge, and boundary conditions are discussed in [40]). The physical properties after cessation of the laser pulse were determined using Helmholtz free energy minimization process [5].…”

Section: Numerical Simulation Showing Development Of Plamsa and Shok-...mentioning

confidence: 99%

Insight into the evolution of laser-induced plasma during successive deposition of laser energy

Singh,

Padhi,

Joarder

2021

Preprint

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The interaction of high-temperature plasma with matter has several potential applications. In this study, we generated laser-induced plasma through single and successive laser energy deposition. The lifetime of the plasma is of paramount importance in most practical applications. However, this cannot be achieved with a single high-energy pulse due to some practical challenges. Therefore we carried out experimental and numerical investigations on the successive laser energy deposition and demonstrated its importance compared to the single pulse energy deposition. It has been observed that during successive energy deposition, the absorption of energy from the second pulse is nonlinear, and the reason for such behaviour is explained in this study. Due to the nonlinear absorption from the second pulse, this study therefore aims to present the pulse interval configuration between the successive pulses with which it is effective for practical use. In this study, some interesting and first direct observations of some new physical phenomena (generation of fourth-lobe and multiple shock waves) are observed during successive energy deposition when the pulse interval is 50 µs and 100 µs. This study also adopted new approch based on Maxwell's theory of momentum exchange between light and matter to explain the newly observed and some previously unexplained physical phenomena. Finally, to understand the evolution of the laser-induced plasma, the volume and volumetric expansion rate are calculated, which can be useful in determining its lifetime and mixing rate with the surrounding medium.

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“…35 U. P. Padhi et al used the Navier–Stokes equations to simulate the evolution of plasma parameters under long and short pulse intervals, and concluded that a single pulse can be replaced by a double pulse with the same total energy and short pulse interval. 36 All the above theoretical studies on the double pulse were carried out in the collinear configuration. Because the collinear and orthogonal structures are different, the signal enhancement mechanisms are also different.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study on signal enhancement of orthogonal double pulse induced plasma

Wang

Wang²,

Zhang

et al. 2022

J. Anal. At. Spectrom.

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Experimental and numerical investigations of double pulse laser energy deposition in air

Cited by 13 publications

References 31 publications

Effect of dual‐optical pulses with temporal energy distribution on laser ablation performance in in vivo zebrafish model

Effect of dual‐optical pulses with temporal energy distribution on laser ablation performance in in vivo zebrafish model

Insight into the evolution of laser-induced plasma during successive deposition of laser energy

Theoretical study on signal enhancement of orthogonal double pulse induced plasma

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