Yoshiro Ito
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Structural barriers control the spatial extent of slow earthquake slip Open
Recent seismological and geodetic observations have revealed shallow slow earthquakes on subduction megathrusts, offering an opportunity to explore the factors controlling megathrust slip. Identifying these controlling factors helps constr…
In-situ characterization of melt pool evolution in laser powder bed fusion using ultrahigh-speed imaging with multidirectional illumination Open
Laser powder bed fusion (LPBF) is a key technology for high-precision manufacturing of complex-shaped metallic components. A detailed understanding of the spatter and melt pool behavior during the process is essential for optimizing the pr…
Observation of laser-induced ablation in silicone oil under varying focal conditions Open
We investigate the effect of focal position on laser ablation of a solid target in silicone oil using photoelasticity imaging technique. By varying the focal plane relative to the target surface, we observe distinct changes in plasma forma…
CrystalFramer: Rethinking the Role of Frames for SE(3)-Invariant Crystal Structure Modeling Open
Crystal structure modeling with graph neural networks is essential for various applications in materials informatics, and capturing SE(3)-invariant geometric features is a fundamental requirement for these networks. A straightforward appro…
Laser Ablation of Copper and YAG:Ce Targets in Liquid PDMS, Studied by Shadowgraph and Photoluminescence Imaging Open
Laser ablation in liquid (LAL) is a well known metal-nanoparticle generation method.A laserinduced bubble is formed by LAL when the laser is focused on a metal surface immersed in a liquid.Although bubbles produced by the laser ablation in…
Highly sensitive detection of sodium in aqueous solutions using laser-induced breakdown spectroscopy with liquid sheet jets Open
Laser-induced breakdown spectroscopy (LIBS) combined with liquid jets was applied to the detection of trace sodium (Na) in aqueous solutions. The sensitivities of two types of liquid jets were compared: a liquid cylindrical jet with a diam…
Formation of Fine Periodic Structures on Back Surface of Si Substrate by a Femtosecond Laser at 1552 nm Open
Si is a semiconductor with a band gap energy of 1.12 eV, which corresponds to a wavelength of 1127.2 nm.Therefore, Si is considered as transparent for radiations longer than this wavelength.We have demonstrated that micromachining through …
Laser-Assisted Wet Etching of Silicon Back Surfaces Using 1552 nm Femtosecond Laser Open
Efficient three-dimensional (3D) microfabrication techniques of an Si are in high demand for producing micrometer-scale 3D structures. Here, we report a new method for processing Si back surfaces using a 1552.5 nm femtosecond laser. As the…
Mechanism of dynamic plasma motion in internal modification of glass by fs-laser pulses at high pulse repetition rate Open
Evolution of free-electron density in internal modification of glass by fs-laser pulses at high pulse repetition rates is simulated based on rate equation model, which is coupled with thermal conduction model in order to incorporate the ef…
View article: Target geometry and rigidity determines laser-induced cavitation bubble transport and nanoparticle productivity – a high-speed videography study
Target geometry and rigidity determines laser-induced cavitation bubble transport and nanoparticle productivity – a high-speed videography study Open
Productivity of laser ablation in liquids we found that the productivity is enhanced for a wire tip laser ablation due to a springboard-like effect of the flexible target releasing the cavitation bubble.
Dynamical Studies on Laser Processes Induced by Short Pulse Lasers: From Nanoseconds to Milliseconds Open
Laser processes induced by short pulse lasers are widely applied in industries and research fields. Details of these processes depend on the laser wavelength and pulse duration of lasers used, materials irradiated, irradiation conditions s…
Machining on Rear Surface of a Silicon Substrate by an Infrared Femtosecond Laser via Non-linear Absorption Processes Open
Silicon (Si) is a semiconductor material widely used in modern technologies such as microelectronics, MEMS, and photonics. Si is an opaque material in visible to near-infrared wavelength region but it transmits any light longer than 1127 n…