Investigation of plume dynamics during picosecond laser ablation of H13 steel using high-speed digital holography

Krste Pangovski; Omonigho B. Otanocha; Shan Zhong; Martin Sparkes; Zhu Liu; William O’Neill; Lin Li

doi:10.1007/s00339-016-0589-3

Investigation of plume dynamics during picosecond laser ablation of H13 steel using high-speed digital holography

Krste Pangovski^*, Omonigho B. Otanocha, Shan Zhong, Martin Sparkes, Zhu Liu, William O’Neill, Lin Li

^*Corresponding author for this work

University of Cambridge

Research output: Contribution to journal › Article › peer-review

Abstract

Ablation of H13 tool steel using pulse packets with repetition rates of 400 and 1000 kHz and pulse energies of 75 and 44μJ, respectively, is investigated. A drop in ablation efficiency (defined here as the depth per pulse or μ m / μ J) is shown to occur when using pulse energies of Epulse>44μJ, accompanied by a marked difference in crater morphology. A pulsed digital holographic system is applied to image the resulting plumes, showing a persistent plume in both cases. Holographic data are used to calculate the plume absorption and subsequently the fraction of pulse energy arriving at the surface after traversing the plume for different pulse arrival times. A significant proportion of the pulse energy is shown to be absorbed in the plume for Epulse>44μJ for pulse arrival times corresponding to > 1 MHz pulse repetition rate, shifting the interaction to a vapour-dominated ablation regime, an energetically costlier ablation mechanism.

Original language	English
Article number	114
Journal	Applied Physics A: Materials Science and Processing
Volume	123
Issue number	2
Early online date	9 Jan 2017
DOIs	https://doi.org/10.1007/s00339-016-0589-3
Publication status	Published - 1 Feb 2017

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10.1007/s00339-016-0589-3Licence: CC BY

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title = "Investigation of plume dynamics during picosecond laser ablation of H13 steel using high-speed digital holography",

abstract = "Ablation of H13 tool steel using pulse packets with repetition rates of 400 and 1000 kHz and pulse energies of 75 and 44μJ, respectively, is investigated. A drop in ablation efficiency (defined here as the depth per pulse or μ m / μ J) is shown to occur when using pulse energies of Epulse>44μJ, accompanied by a marked difference in crater morphology. A pulsed digital holographic system is applied to image the resulting plumes, showing a persistent plume in both cases. Holographic data are used to calculate the plume absorption and subsequently the fraction of pulse energy arriving at the surface after traversing the plume for different pulse arrival times. A significant proportion of the pulse energy is shown to be absorbed in the plume for Epulse>44μJ for pulse arrival times corresponding to > 1 MHz pulse repetition rate, shifting the interaction to a vapour-dominated ablation regime, an energetically costlier ablation mechanism.",

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T1 - Investigation of plume dynamics during picosecond laser ablation of H13 steel using high-speed digital holography

AU - Pangovski, Krste

AU - Otanocha, Omonigho B.

AU - Zhong, Shan

AU - Sparkes, Martin

AU - Liu, Zhu

AU - O’Neill, William

AU - Li, Lin

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Ablation of H13 tool steel using pulse packets with repetition rates of 400 and 1000 kHz and pulse energies of 75 and 44μJ, respectively, is investigated. A drop in ablation efficiency (defined here as the depth per pulse or μ m / μ J) is shown to occur when using pulse energies of Epulse>44μJ, accompanied by a marked difference in crater morphology. A pulsed digital holographic system is applied to image the resulting plumes, showing a persistent plume in both cases. Holographic data are used to calculate the plume absorption and subsequently the fraction of pulse energy arriving at the surface after traversing the plume for different pulse arrival times. A significant proportion of the pulse energy is shown to be absorbed in the plume for Epulse>44μJ for pulse arrival times corresponding to > 1 MHz pulse repetition rate, shifting the interaction to a vapour-dominated ablation regime, an energetically costlier ablation mechanism.

AB - Ablation of H13 tool steel using pulse packets with repetition rates of 400 and 1000 kHz and pulse energies of 75 and 44μJ, respectively, is investigated. A drop in ablation efficiency (defined here as the depth per pulse or μ m / μ J) is shown to occur when using pulse energies of Epulse>44μJ, accompanied by a marked difference in crater morphology. A pulsed digital holographic system is applied to image the resulting plumes, showing a persistent plume in both cases. Holographic data are used to calculate the plume absorption and subsequently the fraction of pulse energy arriving at the surface after traversing the plume for different pulse arrival times. A significant proportion of the pulse energy is shown to be absorbed in the plume for Epulse>44μJ for pulse arrival times corresponding to > 1 MHz pulse repetition rate, shifting the interaction to a vapour-dominated ablation regime, an energetically costlier ablation mechanism.

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Investigation of plume dynamics during picosecond laser ablation of H13 steel using high-speed digital holography

Abstract

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LPRC: Laser Processing Research Centre Impact

MACE Aerodynamics

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Investigation of plume dynamics during picosecond laser ablation of H13 steel using high-speed digital holography

Abstract

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Fingerprint

Projects

LPRC: Laser Processing Research Centre Impact

MACE Aerodynamics

Cite this