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您的检索式：作者名="Maximilian Spellauge"
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| 1 | Time resolved studies reveal the origin of the unparalleled high efficiency of one nanosecond laser ablation in liquids显示文摘Laser ablation in liquid is a scalable nanoparticle production method with applications in areas like catalysis and biomedicine.Due to laser-liquid interactions,different energy dissipation channels such as absorption by the liquid and scattering at the ablation plume and cavitation bubble lead to reduced laser energy available for nanoparticle production.Ultrashort pulse durations cause unwanted nonlinear effects in the liquid,and for ns pulses,intra-pulse energy deposition attenuation effects are to be expected.However,intermediate pulse durations ranging from hundreds of picoseconds up to one nanosecond have rarely been studied in particular in single-pulse settings.In this study,we explore the pico-to nanosecond pulse duration regimes to find the pulse duration with the highest ablation efficiency.We find that pulse durations around 1-2 ns enable the most efficient laser ablation in liquid since the laser beam shielding by the ablation plume and cavitation bubble sets in only at longer pulse durations.Furthermore,pump-probe microscopy imaging reveals that the plume dynamics in liquids start to differ from plume dynamics in air at about 2 ns after pulse impact. | Sarah Dittrich Maximilian Spellauge Stephan Barcikowski Heinz P.Huber Bilal Gökce | 2022 | Opto-Electronic Advances2022，5，6： | 0 |
| 2 | Comparison of ultrashort pulse ablation of gold in air and water by time-resolved experiments显示文摘Laser ablation in liquids is a highly interdisciplinary method at the intersection of physics and chemistry that offers the unique opportunity to generate surfaaant-free and stable nanoparticles from virtually any material.Over the last decades,numerous experimental and computational studies aimed to reveal the transient processes governing laser ablation in liquids.Most experimental studies investigated the involved processes on timescales ranging from nanoseconds to microseconds.However,the ablation dynamics occurring on a sub-nanosecond timescale are of fundamental importance,as the conditions under which nanoparticles are generated are established within this timeframe.Furthermore,experimental investigations of the early timescales are required to test computational predictions.We visualize the complete spatiotemporal picosecond laser-induced ablation dynamics of gold immersed in air and water using ultrafast pump-probe microscopy.Transient reflectivity measurements reveal that the water confinement layer significantly influences the ablation dynamics on the entire investigated timescale from picoseconds to microseconds.The influence of the water confinement layer includes the electron injection and subsequent formation of a dense plasma on a picosecond timescale,the confinement of ablation products within hundreds of picoseconds,and the generation of a cavitation bubble on a nanosecond timescale.Moreover,we are able to locate the temporal appearance of secondary nanoparticles at about 600 ps after pulse impact.The results support computational predictions and provide valuable insight into the early-stage ablation dynamics governing laser ablation in liquids. | Maximilian Spellauge Carlos Donate-Buendia Stephan Barcikowski Bilal Gokce Heinz P.Huber | 2022 | Light(Science & Applications)2022，11，4： | 0 |
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