Mechanisms of graphite ablation by sub-millisecond ytterbium fiber laser pulses

Park, Minok; Balkey, Matthew M.; Mao, Xianglei; Jonsson, Jacob C.; Grigoropoulos, Costas P.; Zorba, Vassilia

doi:10.1063/5.0109618

Mechanisms of graphite ablation by sub-millisecond ytterbium fiber laser pulses

Journal Article · Mon Aug 29 00:00:00 EDT 2022 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0109618· OSTI ID:1959985

^[1]; Balkey, Matthew M. ^[2]; Mao, Xianglei ^[3]; Jonsson, Jacob C. ^[3]; ^[4]; ^[1]

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
Sandia National Laboratory (SNL-NM), Albuquerque, NM (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
University of California, Berkeley, CA (United States)

Graphite is a key material in a variety of cross-cutting applications in energy conversion, energy storage, and nuclear energy. Recently, temporally modulated continuous wave lasers have been shown to produce well-defined ablation features in graphite at relatively high processing speeds. In this work, we analyze in detail the laser ablation dynamics of single-pulse ablation in the sub-millisecond time regime to elucidate the origins of the resulting well-defined ablation craters using a combination of time-resolved emission imaging, diffuse reflection/scattering imaging, and optical emission spectroscopy. These multimodal in situ diagnostics revealed three main contributors to achieve well-defined ablation features: (1) rapid ejection of particles with ~100 m/s speed, (2) ablation of the graphite in the gaseous form, and (3) absence of bulk liquid motion, which is typically observed in laser processing of metals. Plasma plume formation was sustained throughout the duration of the laser pulse (500 μs). Here, this work provides insights into the complex physical and chemical mechanisms of sub-millisecond laser–matter interactions, which are critical for parameter space optimization and tailoring of laser machining and drilling processes.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1959985

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 121; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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