A5101714953- Astrophysics and Cosmic Phenomena
- Advanced Measurement and Metrology Techniques
- Advanced Surface Polishing Techniques
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Laser Material Processing Techniques
- Advanced optical system design
- Power Line Communications and Noise
- Optical Coatings and Gratings
- Optical measurement and interference techniques
- Nonlinear Optical Materials Research
- Structural Behavior of Reinforced Concrete
- Optical Systems and Laser Technology
- Laser-Matter Interactions and Applications
- Nuclear Physics and Applications
- Surface Roughness and Optical Measurements
- Optical Coherence Tomography Applications
- Atomic and Subatomic Physics Research
- Photorefractive and Nonlinear Optics
- Advanced Numerical Analysis Techniques
- Structural Response to Dynamic Loads
- Cell Image Analysis Techniques
- Cellular Mechanics and Interactions
- Hippo pathway signaling and YAP/TAZ
- Millimeter-Wave Propagation and Modeling
RIKEN Center for Advanced Photonics
2015-2024
The University of Tokyo
2011-2021
RIKEN
2018-2021
Kindai University
2016
Hoshi University
2011
Yokohama National University
1995-2002
Tokyo Institute of Technology
1983
Abstract Full elements of second-order nonlinear optical (NLO) tensor can be completely characterized for an organic NLO crystal the first time. As-grown bulk N-benzyl-2-methyl-4-nitroaniline (BNA) was processed to expose (100) and (010) orientations with fine surfaces by using precision lathe diamond blade. Then, every five nonvanishing coefficient BNA determined quantitatively precisely crystals based on 1st-kind Maker fringe measurements. Our method makes it possible clarify uncertain...
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Single-shot optical imaging based on ultrashort lasers has revealed nonrepetitive processes in subnanosecond timescales beyond the recording range of conventional high-speed cameras. However, nanosecond photography without sacrificing short exposure time and image quality is still missing because gap recordable between ultrafast electronic Here, we demonstrate ultrawide time-range using a spectrum circuit that produces interval-tunable pulse trains while keeping durations. We capture shock...
We present sequentially timed all-optical mapping photography (STAMP) with a slicing mirror in branched 4f system for an increased number of frames without sacrificing pixel resolution. The spectrally separates the laser light path into multiple paths by placed Fourier plane. Fabricated ultra-precision end milling process, has 18 facets differing angles. used boosted STAMP to observe dynamics ablation two image sensors which captured subsequent at frame rate 126 billion per second,...
Integral Field Spectroscopy (IFS) is an observational method to obtain spatially resolved spectra over a specific field of view (FoV) in single exposure. In recent years, near-infrared IFS has gained importance observing objects with strong dust attenuation or at high redshift. One limitation existing instruments their relatively small FoV, less than 100 arcsec$^2$, compared optical instruments. Therefore, we have developed (0.9-2.5 $\mathrm{\mu}$m) image-slicer type integral unit (IFU)...
This paper details methods for the precision design and fabrication of neutron-focusing supermirrors, based on electroless nickel plating. We fabricated an elliptic mirror neutron reflectometry, which is our second improved from first. The a 550-millimeter-long segmented assembled using kinematic couplings, with each segment figured by diamond cutting, polished colloidal silica, supermirror coated through ion-beam sputtering. was evaluated beams, reflectivity found to be 68-90% at critical...
This paper details the development of a precise assembly two supermirrors for neutron-focusing, designed installation in neutron reflectometer SOFIA at BL16 J-PARC MLF to intensify illumination small samples. The are sputtered on metal substrates, whose surfaces coated with amorphous Ni-P plating, and figured by diamond cutting polished subnanometer roughness. Special care is taken while polishing substrates reduce waviness surface roughness achieving sharp focusing spot uniform...
This paper proposes and investigates a spread spectrum (SS) system which can realize both ranging communication between vehicle roadside. In order to improve the performance of communication, we propose schemes for cancelling mutual interference SS signal one. Computer simulations illustrate improved accuracy data bit error rate.
Experimental results of the absolute air-fluorescence yield are given very often in different units (photons/MeV or photons/m) and for wavelength intervals. In this work we present a comparison available normalized to its value photons/MeV 337 nm band at 1013 hPa 293 K. The conversion photons/m requires an accurate determination energy deposited by electrons field view experimental set-up. We have calculated deposition each experiment means detailed Monte Carlo simulation been compared with...
This paper describes a development of real-time position capturing method in which branched encoder signals are recorded external data storage, to evaluate motion trajectories the XYZ table on ultra-precision machine tool. The allows with minimal modification machine: without any additional sensors. In previous study we generated non-axisymmetric aspherical optical element by XZC-axis simultaneous numerical controlled turning process 2 μm form deviation, reason accuracy degradation wasn’t...
An on-machine measurement (OMM) system is an effective apparatus for achieving efficient profile compensation and improving machining conditions in ultrahigh precision machining. Herein, we report a new OMM with confocal chromatic probe on five-axis machine tool constructed using real-time position capturing method. The positions are captured synchronously personal computer to generate data. Long- short-term stability, micro step response, repeatability tests optical flat indicates that the...
The peak intensity from high harmonic generation source is approaching PW/cm 2 , which enables us to observe attosecond nonlinear optical phenomena in solids. We developed a high-precision focusing system improve the intensity.
Integral field spectroscopy (IFS) is an observational method for obtaining spatially resolved spectra over a specific of view (FoV) in single exposure. In recent years, near-infrared IFS has gained importance observing objects with strong dust attenuation or at high redshift. One limitation existing instruments their relatively small FoV, less than 100 arcsec2, compared optical instruments. Therefore, we developed (0.9 to 2.5 μm) image-slicer type integral unit (IFU) larger FoV 13.5×10.4...
This paper reports a result of construction an on-machine measurement system on the ultraprecision machine tool, using confocal chromatic probe to material surface and real-time position capturing method in which branched encoder signals are recorded external data storage, evaluate motion trajectories ultra-precision tool. In optical flat, micro waviness has been observed, is considered be cause mid spatial frequency profile error. The repeatability about 2 nm X-axis direction 7.5 Z-axis direction.
The adherens junction (AJ) is an actin filament-anchoring junction. It plays a central role in epithelial morphogenesis through cadherin-based recognition and adhesion among cells. stability plasticity of AJs are required for the morphogenesis. An actin-binding α-catenin essential component cadherin-catenin complex functions as tension transducer that changes its conformation induces AJ development response to tension. Despite much progress understanding molecular mechanisms sensitivity...
Abstract Polymyrifline A (I) is isolated from the peels of title plant together with known polymethoxy flavones.
We are developing an image-slicer type integral field unit (IFU), SWIMS-IFU, for SWIMS (Simultaneous-color Wide-field Infrared Multi-object Spectrograph), a near-infrared instrument TAO 6.5 m telescope. SWIMS- IFU divides field-of-view of 16:006 12:008 into 26 slices with width 0:005, which is the largest FoV among IFUs on 8 class telescopes. It also capable obtaining entire spectra from 0.9 to 2.5 R1000 single exposure. Because limitations space in SWIMS, SWIMS-IFU should fit volume 170 x...
This conference presentation was prepared for the Advances in Optical and Mechanical Technologies Telescopes Instrumentation V at SPIE Astronomical + Instrumentation, 2022.
A new on-machine measurement system using ultraprecision machine tool has been developed. The real-time monitoring can acquire 3-axis position signals of the in 10 nm resolution additional electrical circuits which are connected between a personal computer and 3 linear scale sensors ultrahigh precision tool. 10nm optical fiber-type sensor with small air slide ruby stylus settled on for profile measurement. Experiments performed machined nonsymmetrical surface. Furthermore, was applied an...
The conditions within the giant lobes of Centaurus A are reviewed in light recent radio and γ-ray observations.Data from WMAP ground-based telescopes conjunction with measurements Fermi-LAT constrain characteristic field strength maximum electron energy.The implications for transport energetic particles discussed terms residence times cooling lobes.Acceleration electrons UHECR via second order Fermi mechanism is discussed.