Laser-based material interactions and ablation processes by bursts of 70 ps pulses

Kočica, Jernej Jan; Mur, Jaka; Petelin, Jaka; Petkovšek, Rok

doi:10.1364/oe.428704

Cited by 8 publications

(5 citation statements)

References 43 publications

(52 reference statements)

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“…The illumination through an optical prism also complicates sample preparation. Since the intrinsic optomechanical probe bandwidth (limited by the photons’ lifetime) is ≈20 GHz, these challenges may be overcome thanks to novel photodetectors with bandwidths up to 25 GHz, which could increase the time-resolution by a factor of ≈200×. The need for a transparent prism can also be avoided by implementing a top-down illumination scheme or by measuring fast Joule heating events in electronic devices.…”

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confidence: 99%

High Throughput Nanoimaging of Thermal Conductivity and Interfacial Thermal Conductance

et al. 2022

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Thermal properties of materials are often determined by measuring thermalization processes; however, such measurements at the nanoscale are challenging because they require high sensitivity concurrently with high temporal and spatial resolutions. Here, we develop an optomechanical cantilever probe and customize an atomic force microscope with low detection noise ≈1 fm/Hz 1/2 over a wide (>100 MHz) bandwidth that measures thermalization dynamics with ≈10 ns temporal resolution, ≈35 nm spatial resolution, and high sensitivity. This setup enables fast nanoimaging of thermal conductivity (η) and interfacial thermal conductance (G) with measurement throughputs ≈6000× faster than conventional macroscale-resolution timedomain thermoreflectance acquiring the full sample thermalization. As a proof-of-principle demonstration, 100 × 100 pixel maps of η and G of a polymer particle are obtained in 200 s with a small relative uncertainty (<10%). This work paves the way to study fast thermal dynamics in materials and devices at the nanoscale.

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confidence: 99%

High Throughput Nanoimaging of Thermal Conductivity and Interfacial Thermal Conductance

et al. 2022

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“…These equations don't take into consideration the heat accumulation [25] or particle and plasma shielding in ultra-short laser processing cases because the repetition rate of the laser used is less than 100 kHz [15,16,18].…”

Section: Topographical Analysismentioning

confidence: 99%

“…In a laser drilling of stainless steel and copper using picosecond laser beams using 6 ps and 100 kHz repetition rate, Ancona et al [15], noted that ablation efficiency increases as pulse energies increase. Other researchers have carried out research using the burst mode of ultrafast laser processing of different targets and made a comparison to normal pulsed mode and have established that burst mode performs better in ablation efficiency [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of processing efficiency, surface, and bulk chemistry, and nanomechanical properties of the Monel^® alloy 400 after ultrashort pulsed laser ablation

Ronoh,

Novotný,

Mrňa

et al. 2024

Mater. Res. Express

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Monel® alloy 400 has excellent corrosion resistance and finds applications in marine industries. The processing of marine components requires high processing efficiency and a quality finish. Hence, this research aims to investigate the effects of the laser processing parameters such as laser fluence, scanning velocity, hatching distance, and the scanning pass on the ablation rates and efficiency, chemistry, and nanomechanical properties of the Monel® alloy 400 after pulsed picosecond (ps) laser ablation. From the experimental findings, the ablation depth increases as the laser fluence increases while decreasing as the scanning velocity increases. Surface roughness was noted to increase as the laser fluence increased. The findings demonstrated that the ablation rate increases as laser fluence increases while ablation efficiency decreases. Energy dispersive X-ray spectroscopy (EDX) showed that the elemental composition of laser-ablated zones is almost similar to that of the polished sample. X-ray spectroscopy (XPS) shows that the outer layer on the surface of Monel® alloy 400 is composed of NiO and CuO. The hardness and Young’s modulus of the laser-processed alloy were found to be less than those of the bulk material. This study can be used to establish optimal processing parameters for the ultrafast ps laser processing of materials to achieve high ablation efficiency with a high-quality surface finish for industrial applications.

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“…The laser processing was followed by the analysis of spot evolution over multiple pulse repetitions on a single spot. First, we observed single-pulse ablation craters on the stainless steel surface and compared the results with a simple model for pulsed laser ablation, typically valid for ultrashort pulses [4] but also applicable in cases where heat transfer during the pulse duration is negligible [37]. The expression was established for laser processing by Liu et al [38] and adopted in research works since Furmanski et al [39].…”

Section: Positioning Accuracy Measurementmentioning

confidence: 99%

Pulse-on-Demand Operation for Precise High-Speed UV Laser Microstructuring

Kočica

Mur

Didierjean³

et al. 2023

Micromachines

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Laser microstructuring has been studied extensively in the last decades due to its versatile, contactless processing and outstanding precision and structure quality on a wide range of materials. A limitation of the approach has been identified in the utilization of high average laser powers, with scanner movement fundamentally limited by laws of inertia. In this work, we apply a nanosecond UV laser working in an intrinsic pulse-on-demand mode, ensuring maximal utilization of the fastest commercially available galvanometric scanners at scanning speeds from 0 to 20 m/s. The effects of high-frequency pulse-on-demand operation were analyzed in terms of processing speeds, ablation efficiency, resulting surface quality, repeatability, and precision of the approach. Additionally, laser pulse duration was varied in single-digit nanosecond pulse durations and applied to high throughput microstructuring. We studied the effects of scanning speed on pulse-on-demand operation, single- and multipass laser percussion drilling performance, surface structuring of sensitive materials, and ablation efficiency for pulse durations in the range of 1–4 ns. We confirmed the pulse-on-demand operation suitability for microstructuring for a range of frequencies from below 1 kHz to 1.0 MHz with 5 ns timing precision and identified the scanners as the limiting factor even at full utilization. The ablation efficiency was improved with longer pulse durations, but structure quality degraded.

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Laser-based material interactions and ablation processes by bursts of 70 ps pulses

Cited by 8 publications

References 43 publications

High Throughput Nanoimaging of Thermal Conductivity and Interfacial Thermal Conductance

High Throughput Nanoimaging of Thermal Conductivity and Interfacial Thermal Conductance

Analysis of processing efficiency, surface, and bulk chemistry, and nanomechanical properties of the Monel^® alloy 400 after ultrashort pulsed laser ablation

Pulse-on-Demand Operation for Precise High-Speed UV Laser Microstructuring

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Laser-based material interactions and ablation processes by bursts of 70 ps pulses

Cited by 8 publications

References 43 publications

High Throughput Nanoimaging of Thermal Conductivity and Interfacial Thermal Conductance

High Throughput Nanoimaging of Thermal Conductivity and Interfacial Thermal Conductance

Analysis of processing efficiency, surface, and bulk chemistry, and nanomechanical properties of the Monel® alloy 400 after ultrashort pulsed laser ablation

Pulse-on-Demand Operation for Precise High-Speed UV Laser Microstructuring

Contact Info

Product

Resources

About

Analysis of processing efficiency, surface, and bulk chemistry, and nanomechanical properties of the Monel^® alloy 400 after ultrashort pulsed laser ablation