A5101405678- Laser Material Processing Techniques
- Digital Holography and Microscopy
- Laser Design and Applications
- Astrophysics and Cosmic Phenomena
- Laser-Matter Interactions and Applications
- Fluid Dynamics and Mixing
- Nonlinear Optical Materials Studies
- Image Processing Techniques and Applications
- Mobile Learning in Education
- Advanced optical system design
- Optical Polarization and Ellipsometry
- Advanced Optical Sensing Technologies
- Advanced Fiber Laser Technologies
- Optical Coatings and Gratings
- Advanced X-ray Imaging Techniques
- Advanced Optical Imaging Technologies
- Freezing and Crystallization Processes
- Radio Astronomy Observations and Technology
- Optical measurement and interference techniques
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Web Applications and Data Management
- Neutrino Physics Research
- Optical Coherence Tomography Applications
- Laser-Ablation Synthesis of Nanoparticles
Lawrence Livermore National Laboratory
1973-2025
Swinburne University of Technology
2019-2025
University of Chicago
2023
Australian Research Council
2022-2023
University of Notre Dame
2022-2023
Optical Sciences (United States)
2022-2023
Improved Pharma (United States)
2022
University of Arizona
2022
University of Bristol
2021
University of Alberta
2000-2019
A refractive lens is one of the simplest, most cost-effective and easily available imaging elements. Given a spatially incoherent illumination, can faithfully map every object point to an image in sensor plane, when distances satisfy conditions. However, static limited depth focus, beyond which point-to-point mapping only be obtained by changing either location lens, or sensor. In this study, focus mode has been expanded using recently developed computational reconstruction method,...
Large laser systems that deliver optical pulses with peak powers exceeding one Petawatt (PW) have been constructed at dozens of research facilities worldwide and fostered in High-Energy-Density (HED) Science, High-Field nonlinear physics [1]. Furthermore, the high intensities 10<sup>18</sup>W/cm<sup>2</sup> allow for efficiently driving secondary sources inherit some properties pulse, e.g. pulse duration, spatial and/or divergence characteristics. In intervening decades since first PW laser,...
Pattern recognition techniques form the heart of most, if not all, incoherent linear shift-invariant systems. When an object is recorded using a camera, information sampled by point spread function (PSF) system, replacing every with PSF in sensor. The sharp Kronecker Delta-like when numerical aperture (NA) large no aberrations. NA small, and system has aberrations, appears blurred. In case known, then blurred image can be deblurred scanning over intensity pattern looking for matching...
Membrane processes have become a competitive option to conventional treatment technologies because of the high quality product water. In particular, nanofiltration and reverse osmosis been found remove materials like natural organic matter, disinfection by-products, endocrine-disrupting compounds. However, an issue identified as one major drawbacks for adoption pressure-driven membrane is need additional concentrate stream. Few studies dealing with published. The majority published address...
The reflectance (R) of linear and circular micro-gratings on c-plane sapphire Al2O3 ablated by a femtosecond (fs) laser, were spectrally characterised for thermal emission ∝ (1 − R) in the mid-to-far infrared (IR) spectral range. An IR camera was used to determine blackbody radiation temperature from laser patterned regions, which showed (3 6)% larger emissivity dependent grating pattern. azimuthal curve closely followed Lambertian angular profile cos θa at 7.5-13 µm band. backside ablation...
Abstract: In this special section, educators describe current approaches to teaching theatre. Drawing from their experiences in K–12, community theatre, and higher education contexts, seventeen theatre explain pedagogical responses the COVID-19 pandemic, administrative cutbacks, campus issues, generative AI, accessibility, consent, students’ fear of taking risks. These short pieces also provide new ways considering assessment, history performance theory, engaging non-majors studies. This...
The reflectance (R) of linear and circular micro-gratings on c-plane sapphire Al2O3 ablated by a femtosecond (fs) laser were spectrally characterised for thermal emission ∝(1−R) in the mid-to-far infrared (IR) spectral range. An IR camera was used to determine blackbody radiation temperature from laser-patterned regions, which showed (3–6)% larger emissivity dependent grating pattern. azimuthal curve closely followed Lambertian angular profile ∝cosθa at 7.5–13 μm band. back-side ablation...
The HAPLS laser system has been commissioned to its first integrated performance milestone, delivering pulses with 16J sub-30fs duration at a 3⅓Hz repetition rate. This all-diode-pumped petawatt-class offers the average powers required for secondary source applications.
Mathematical models previously employed to analyze concentration profiles of dissolved ozone in bubble‐column contactors often assumed either plug flow or complete mixing. In this paper a more realistic model, the axial dispersion model (ADM), was provided integrate nonideal mixing, mass‐transfer, and ozone‐decay process as whole. The effects various parameters on were analyzed numerically. It found that group dimensionless quantities (PeL, Da, StG, StL) is most convenient describing...
Direct imaging systems that create an image of object directly on the sensor in a single step are prone to many constraints, as perfect is required be recorded within this step. In designing high resolution direct with diffractive lens, outermost zone width either reaches lithography limit or diffraction itself, imposing challenges fabrication. However, if mode switched indirect one consisting multiple steps complete imaging, then different possibilities open. One such method widely used...
We overview recent developments of 3D± (additive/subtractive) manufacturing/printing from the point view laser development, beam delivery tools, applications, and materials. The average power ultra-short-pulsed lasers has followed a Moore's scaling trajectory, doubling every two years, for past 20 years. This requires fast scanning solutions control larger-area applications. New material synthesis with high spatial resolution is provided at intensity TW/cm2-PW/cm2 exposure site. Net-shape...
Axial resolution is one of the most important characteristics a microscope. In all microscopes, high axial desired in order to discriminate information efficiently along longitudinal direction. However, when studying thick samples that do not contain laterally overlapping information, low desirable as from multiple planes can be recorded simultaneously single camera shot instead plane-by-plane mechanical refocusing. this study, we increased focal depth an infrared microscope non-invasively...
Axial resolution is one of the most important characteristics a microscope. In all microscopes, high axial desired in order to discriminate information efficiently along longitudinal direction. However, when studying thick samples that do not contain laterally overlapping information, low desirable, as from multiple planes can be recorded simultaneously single camera shot instead plane-by-plane mechanical refocusing. this study, we increased focal depth an infrared microscope non-invasively...
New measurements of the angular distributions effusive gas beams emanating from two collimating tube sources are presented. These a single aspect ratio 25 and multi-capillary array 100. The data were collected for wide variety gases (He, Ne, Ar, Kr, Xe, H2, N2, CO2 C2H2) over broad range driving pressures. profiles obtained by rotating ionization gauge detector about centre exit tube. acquired as function flow rate pressure in source line. Comparisons present with other experimental work models made.
Herein, we give an overview of several less explored structural and optical characterization techniques useful for biomaterials. New insights into the structure natural fibers such as spider silk can be gained with minimal sample preparation. Electromagnetic radiation (EMR) over a broad range wavelengths (from X-ray to THz) provides information material at correspondingly different length scales (nm-to-mm). When features, alignment certain fibers, cannot characterized optically, polarization...
Overview of progress in construction and testing the laser systems ELI-Beamlines, accomplished since 2015, is presented. Good has been achieved all four lasers based largely on technology diode-pumped solid state (DPSSL). The first part L1 laser, designed to provide 200 mJ <15 fs pulses at 1 kHz repetition rate, up running. L2 a development line employing 10 J / Hz cryogenic gas-cooled pump which recently equipped with an advanced engine. Operation L3-HAPLS system, using DPSSL Ti:sapphire...
Indirect imaging methods involve at least two steps, namely optical recording, and computational reconstruction. The recording process uses an modulator that transforms the light from object into a typical intensity distribution. This distribution is numerically processed to reconstruct object’s image corresponding different spatial spectral dimensions. There have been numerous modulation functions reconstruction developed in past years for applications. In most cases, compatible pair of...
Microlens arrays (MLAs) which are increasingly popular micro-optical elements in compact integrated optical systems were fabricated using a femtosecond direct laser write (fs-DLW) technique the low-shrinkage SZ2080TM photoresist. High-fidelity definition of 3D surfaces on IR transparent CaF2 substrates allowed to achieve ∼50% transmittance chemical fingerprinting spectral region 2-5 μm wavelengths since MLAs only ∼10 high corresponding numerical aperture 0.3 (the lens height is comparable...