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We are developing a multi-purpose aerogel Cherenkov counter (M-ACC). M-ACC is a particle identification (PID) device which works in a narrow space and can cover large area with arbitrary shapes. It can also function in a magnetic field. M-ACC has a light guide comprising wavelength shifting fibers (WLSF), and its application is π/Κ identification in high-energy physics experiments, β-ray detection...
Using microelectromechanical systems technology, the authors have developed the world's smallest, lightest and lowest electric power-consuming laser Doppler blood flow sensor that can measure blood flow while the subject is moving. The influence of alcohol consumption on blood flow was investigated when measuring at a subject's earlobe. An arm-raising test in which the subject lifts an arm with the...
We developed an optical frequency standard using 40Ca+ with the 4 2S1/2-3 2D5/2 electric quadrupole transition. Its absolute transition frequency is 411 042 129 776 390(7) Hz. The uncertainty is limited by the electric quadrupole shift and ambient magnetic field fluctuation. To determine the absolute transition frequency with a better uncertainty, we have observed two pairs of the symmetrically-splitting...
It is proposed and investigated the 8-cm-long slightly curved parallel plate oversized waveguide as wideband THz interconnecting line. Its use in waveguide TDS is demonstrated by measuring absorbance of tiny amount of water vapor.
We have developed a 1 GHz synthesis chain based on a cryogenic sapphire oscillator. The 11.2005 GHz output of the CSO is down-converted for laboratory distribution. The frequency stability of the down-converter itself is 2times10-15 at an averaging time of 1 second. The long-term drift of the CSO is suppressed by referencing it to a hydrogen maser linked to Japan Standard Time. An application of this...
Generation of a chirped comb with chirp rate of 85 PHz/s across 130 GHz from a frequency-shifted feedback ring laser with semiconductor optical amplifier as gain medium is reported. Electronic tunability from 1535 to 1580 nm was measured.
We developed two new kinds of terahertz-wave parametric generators (TPG) by using compact pump sources. One TPG generates high energy and broadband THz-waves with high stability, the other has a potential to be a narrow-linewidth injection-seeded TPG.
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