CUED Publications database

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

Pangovski, K and Otanocha, OB and Zhong, S and Sparkes, M and Liu, Z and O Neill, W and Li, L (2017) Investigation of plume dynamics during picosecond laser ablation of H13 steel using high-speed digital holography. Applied Physics A: Materials Science and Processing, 123. ISSN 0947-8396

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Abstract

© 2017, The Author(s). 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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Div E > Manufacturing Systems
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:16
Last Modified: 24 Aug 2017 01:30
DOI: