scholarly journals Efficient Drilling of Amorphous Alloy Foils Using Low-Energy Long Pulses of a Nd:YAG Laser

2022 ◽  
Author(s):  
Takeshi Tsuji ◽  
Shota Yamamoto ◽  
Shun Ikemoto ◽  
Hiromasa Hara ◽  
Motoki Ohta ◽  
...  
Keyword(s):  
Amorphous Alloy ◽  
Nd:Yag Laser ◽  
Target Material ◽  
Low Energy ◽  
Metal Species ◽  
Single Shot ◽  
Plasma Generation ◽  
Metal Foils ◽  
Alloy Foil ◽  
Through Hole

Abstract Laser drilling of amorphous alloy foils was conducted using low-energy long-pulses (LP) generated using a Nd:YAG laser. Results showed that LP can drill an amorphous alloy foil more efficiently than a nanosecond pulse (NSP) can: an LP at 1 mJ can open a through-hole on an amorphous alloy foil with 25 mm thickness although single shot NSP at 20 mJ formed a crater with ca. 3 mm depth. From these findings, we infer that the markedly higher drilling efficiency of a low-energy LP than that of NSP is attributable to 1) lower plasma generation by LP than by NSP, and 2) repeated irradiation of the target material by multiple sub-pulses in an LP. Results also demonstrate that low-energy LP drilling is applicable to various metal foils and that the drilling efficiency depends on the metal species.

Influence of Nd:YAG Laser Irradiation on an Adhesive Restorative Procedure

2006 ◽  
Vol 31 (5) ◽  
pp. 604-609 ◽  
Author(s):  
M. Franke ◽  
A. W. Taylor ◽  
A. Lago ◽  
M. C. Fredel
Keyword(s):  
Statistical Analysis ◽  
Bond Strength ◽  
Laser Irradiation ◽  
Significant Influence ◽  
Nd:Yag Laser ◽  
Deleterious Effect ◽  
Adhesive System ◽  
High Energy ◽  
Low Energy ◽  
Adhesive Penetration

Clinical Relevance Statistical analysis of the results obtained in this study shows that Nd:YAG laser irradiation on the adhesive system has a significant influence on bond strength to dentin. Bond strength is improved by better adhesive penetration when low energy is applied; whereas, high energy densities have a deleterious effect on the procedure.

Laser drilling process of Fe78Si9B13 amorphous alloy foil

2020 ◽  
Vol 565 (1) ◽  
pp. 77-87
Author(s):  
Chuanjie Wang ◽  
Haiyang Wang ◽  
Gang Chen ◽  
Lingjiang Cui ◽  
Peng Zhang
Keyword(s):  
Amorphous Alloy ◽  
Laser Drilling ◽  
Drilling Process ◽  
Alloy Foil

scholarly journals Low-Energy Muons as a Tool for a Depth-Resolved Analysis of the SiO2/4H-SiC Interface

2020 ◽  
Vol 1004 ◽  
pp. 581-586
Author(s):  
Judith Woerle ◽  
Thomas Prokscha ◽  
Ulrike Grossner
Keyword(s):  
Depth Distribution ◽  
Muon Spin ◽  
Target Material ◽  
Spin Rotation ◽  
Low Energy ◽  
Muon Spin Rotation ◽  
Spatial Extension ◽  
Thermal Oxide ◽  
Induced Defects ◽  
Thermally Grown

In this work, the potential of muon spin rotation (μSR) with low-energy muons (LE-μ) for the investigation of oxidation-induced defects at the SiO2/4H-SiC interface is explored. By using implantation energies for the muons in the keV range and comparing the fractions of muonium in different regions, the depth distribution of defects in the first 200 nm of the target material can be resolved. Defect profiles of interfaces with either deposited or thermally grown SiO2 layers on 4H-SiC are compared. The results show an increased number of defects in the case of a thermal oxide, both on the oxide and on the SiC side of the interface, with a spatial extension of a few tens of nm.

NUMERICAL SIMULATION FOR SHOT-PEENING BASED ON SPH-COUPLED FEM

2011 ◽  
Vol 08 (04) ◽  
pp. 731-745 ◽  
Author(s):  
JIANMING WANG ◽  
FEIHONG LIU
Keyword(s):  
Residual Stress ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Target Material ◽  
Material Model ◽  
Single Shot ◽  
Fem Modeling ◽  
Contact Algorithm ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

In dealing with shot-peening simulation, existing literatures adopt finite element method (FEM), which establishes models of a single shot or several shots only, thus the effect of a large number of shots repeat impacting and the influence among adjacent shots are ignored. To overcome these disadvantages of FEM models, smoothed particle hydrodynamics (SPH)-coupled FEM modeling is presented, in which the shots are modeled by SPH particles and the target material is modeled by finite elements. The two parts interact through contact algorithm to simulate a number of shots impinging the target. Utilizing this model, a material model for shots is established, the relationships between compressive residual stress and peening frequencies, coverage, and velocities are analyzed. Steady compressive residual stress can be obtained by multiple peening; higher coverage can improve the compressive residual stress; faster velocities can induce greater and deeper maximum residual stress in target subsurface. The simulation results agree well with the existing experimental data. The study would not only provide a new powerful tool for the simulation of shot-peening process, but also be benefit to optimize the operating parameters.

Time- and spatial-resolved XAFS spectroscopy in a single shot: new analytical possibilities forin situmaterial characterization

2016 ◽  
Vol 23 (3) ◽  
pp. 769-776 ◽  
Author(s):  
Ana Guilherme Buzanich ◽  
Martin Radtke ◽  
Uwe Reinholz ◽  
Heinrich Riesemeier ◽  
Franziska Emmerling
Keyword(s):  
Ccd Camera ◽  
Single Shot ◽  
Transmitted Beam ◽  
X Ray ◽  
Structure Information ◽  
Xafs Spectroscopy ◽  
Area Detector ◽  
Metal Foils ◽  
Set Up ◽  
X Ray Absorption

A new concept that comprises both time- and lateral-resolved X-ray absorption fine-structure information simultaneously in a single shot is presented. This uncomplicated set-up was tested at the BAMline at BESSY-II (Berlin, Germany). The primary broadband beam was generated by a double multilayer monochromator. The transmitted beam through the sample is diffracted by a convexly bent Si (111) crystal, producing a divergent beam. This, in turn, is collected by either an energy-sensitive area detector, the so-called color X-ray camera, or by an area-sensitive detector based on a CCD camera, in θ–2θ geometry. The first tests were performed with thin metal foils and some iron oxide mixtures. A time resolution of lower than 1 s together with a spatial resolution in one dimension of at least 50 µm is achieved.

The use of high density metal foils to increase surface dose in low-energy clinical electron beams

1999 ◽  
Vol 53 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Geoff D. Lambert ◽  
Neil D. Richmond ◽  
Rachel H. Kermode ◽  
David J.T. Porter
Keyword(s):  
Electron Beams ◽  
High Density ◽  
Low Energy ◽  
Surface Dose ◽  
Metal Foils

scholarly journals Projective phase measurements in one-dimensional Bose gases

2018 ◽  
Vol 5 (5) ◽  
Author(s):  
Yuri Daniel van Nieuwkerk ◽  
Jörg Schmiedmayer ◽  
Fabian Essler
Keyword(s):  
Particle Density ◽  
Low Energy ◽  
Direct Access ◽  
Single Shot ◽  
Bose Gases ◽  
Phase Measurements ◽  
One Dimensional ◽  
Phase Fields ◽  
Theoretical Assumptions ◽  
Point Correlation

We consider time-of-flight measurements in split one-dimensional Bose gases. It is well known that the low-energy sector of such systems can be described in terms of two compact phase fields \hat{\phi}_{a,s}(x)ϕ̂a,s(x). Building on existing results in the literature we discuss how a single projective measurement of the particle density after trap release is in a certain limit related to the eigenvalues of the vertex operator e^{i\hat{\phi}_a(x)}eiϕ̂a(x). We emphasize the theoretical assumptions underlying the analysis of “single-shot” interference patterns and show that such measurements give direct access to multi-point correlation functions of e^{i\hat{\phi}_a(x)}eiϕ̂a(x) in a substantial parameter regime. For experimentally relevant situations, we derive an expression for the measured particle density after trap release in terms of convolutions of the eigenvalues of vertex operators involving both sectors of the two-component Luttinger liquid that describes the low-energy regime of the split condensate. This opens the door to accessing properties of the symmetric sector via an appropriate analysis of existing experimental data.

Nanosecond Laser Experiments of Microstructure Adhesion Reduction

1999 ◽  
Author(s):  
James W. Rogers ◽  
Leslie M. Phinney
Keyword(s):  
Laser Fluence ◽  
Nd:Yag Laser ◽  
Polycrystalline Silicon ◽  
Surface Forces ◽  
Operating Conditions ◽  
Nanosecond Laser ◽  
Single Shot ◽  
Ultrashort Pulse Lasers ◽  
Adhesion Reduction ◽  
Laser Experiments

Abstract Due to the small size of structures in modern microdevices, surface forces can create undesirable adhesion between microstructures, which is referred to as stiction. Prior investigations have used ultrashort-pulse lasers to recover stiction-failed microcantilevers. The current experiments study the use of a 400 ns, 1064 nm, Nd:YAG laser to free polycrystalline silicon microcantilevers stuck to the underlying substrate. The results show that a Nd:YAG, 1064 nm laser is capable of recovering failed microstructures with yields exceeding those reported in earlier studies. Yields of 100 percent for cantilevers up to 1 mm in length were demonstrated for several laser operating conditions. The yields are strongly dependent on laser fluence and slightly dependent on exposure time, with a single-shot at 160 mJ/cm2 resulting in yields around 60 percent.

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