TEM sample preparation by femtosecond laser machining and ion milling for high-rate TEM straining experiments

Voisin, Thomas; Grapes, Michael D.; Zhang, Y.; Lorenzo, Nicholas; Ligda, Jonathan P.; Schuster, Brian E.; Weihs, Timothy P.

doi:10.1016/j.ultramic.2016.12.001

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…A finishing step is generally required, as the surface quality resulting from USP laser processing, as well as near-surface material modification, impedes surface sensitive analysis such as electron backscatter diffraction (EBSD) and might influence the results of mechanical experiments, especially regarding miniaturized samples. Although special cases might not pose such strict surface quality requirements, e.g., miniaturized fracture mechanical experiments, 13 , 14 where a FIB notch acts as a defined defect, in general, FIB polishing is required to produce a diminishingly influenced and smooth surface before mechanical testing.…”

Section: Introductionmentioning

confidence: 99%

A Perspective to Control Laser-Induced Periodic Surface Structure Formation at Glancing-Incident Femtosecond Laser-Processed Surfaces

Jelinek

Pfeifenberger

Pippan

et al. 2021

JOM

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The favorable combination of high material removal rate and low influence on the material beneath the ultra-short pulsed laser-processed surface are of particular advantage for sample preparation. This is especially true at the micrometer scale or for the pre-preparation for a subsequent focused ion beam milling process. Specific surface features, the laser-induced periodic surface structures, are generated on femtosecond laser-irradiated surfaces in most cases, which pose an issue for surface-sensitive mechanical testing or microstructural investigations. This work strives for an approach to enhance the surface quality of glancing-incident laser-processed surfaces on the model material copper with two distinctly different grain sizes. A new generalized perspective is presented, in which optimized parameter selection serves to counteract the formation of the laser-induced periodic surface structures, enabling, for example, grain orientation mapping directly on femtosecond laser processed surfaces.

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Section: Introductionmentioning

confidence: 99%

A Perspective to Control Laser-Induced Periodic Surface Structure Formation at Glancing-Incident Femtosecond Laser-Processed Surfaces

Jelinek

Pfeifenberger

Pippan

et al. 2021

JOM

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“…Although the physical picture of laser-matter interaction is not completely clear, it is generally believed that photoionization is the basic mechanism for fs-laser utilized in material microprocessing, similar to the high-energy radiation [7,18,19]. In addition to being a defect/lattice distortion creator in transparent materials, fs-laser has also been shown over the past few decades to be a very effective tool to study coherent lattice oscillations (or CP) [20].…”

Section: Introductionmentioning

confidence: 99%

“…Especially, the laser pulse duration in most of the work on ultrafast spectroscopy is hitherto around 100 fs or even longer. It is only suitable for the study of low-frequency vibrations since the CP generation requires the pulse duration much shorter than the phonon periods [14,19]. It was reported that typical Raman spectrum of sapphire crystal includes at least 7 active phonon modes (2A 1g + 5E g ) [10], thus further studies necessitate much shorter pulse duration to resolve more details of the CP dynamics.…”

Section: Introductionmentioning

confidence: 99%

Coherent phonon dynamics in a c-plane sapphire crystal before and after intense femtosecond laser irradiation

Zhao¹,

Nie²,

Ma³

et al. 2020

Opt. Express

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Femtosecond pump-probe experiments with a ∼6.4 fs time-resolution were performed to investigate the coherent phonon dynamics in a c-plane sapphire crystal before and after intense 800 nm femtosecond laser irradiation. The intense femtosecond laser induced defect/distortion and even re-crystallization of crystalline structures, which result in the appearance of new peaks and relative intensity change in coherent phonon and Raman spectra. The combination of these two spectra was found to be beneficial to evidence the variation of crystalline structure and further to differentiate the origins of new Raman peaks after irradiation. Further analysis of time-dependent differential absorbance with damped cosine function fitting and Fourier transfer calculation yields the vibrational parameters, including periods, damping times and initial phases, before and after irradiation. With these parameters, the defect-effects on damping time and the mechanism of coherent phonon generation were addressed.

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Femtosecond Laser Ablation for Mesoscale Specimen Evaluation

McCulloch

Gigax

Hosemann

2020

JOM

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TEM sample preparation by femtosecond laser machining and ion milling for high-rate TEM straining experiments

Cited by 8 publications

References 38 publications

A Perspective to Control Laser-Induced Periodic Surface Structure Formation at Glancing-Incident Femtosecond Laser-Processed Surfaces

A Perspective to Control Laser-Induced Periodic Surface Structure Formation at Glancing-Incident Femtosecond Laser-Processed Surfaces

Coherent phonon dynamics in a c-plane sapphire crystal before and after intense femtosecond laser irradiation

Femtosecond Laser Ablation for Mesoscale Specimen Evaluation

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