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Your search keyword '"Minoshima, Kaoru"' showing total 490 results
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490 results on '"Minoshima, Kaoru"'

179. Optical-frequency-comb based ultrasound sensor

Author

Minamikawa, Takeo, additional, Ogura, Takashi, additional, Masuoka, Takashi, additional, Hase, Eiji, additional, Nakajima, Yoshiaki, additional, Yamaoka, Yoshihisa, additional, Minoshima, Kaoru, additional, and Yasui, Takeshi, additional

Published
2017
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180. Complex electro-optic constants of dye-doped polymer films determined with a Mach–Zehnder interferometer.

Author

Ono, Hiroshi, Misawa, Kazuhiko, Minoshima, Kaoru, Ueki, Akikatsu, and Kobayashi, Takayoshi

Subjects
ELECTROOPTICS, POLYMERS, THIN films, INTERFEROMETERS
Abstract

Presents a study whicih examined the complex electro-optic constants of dye-doped polymer films by a Mach-Zehnder interferometer. Information on the samples; Measurement method used in the study; Measurement of the thickness of dye polymethylmethacrylate films; Details on the experimental arrangement.

Published
1995
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183. High-accuracy measurement of 240-m distance in an optical tunnel by use of a compact femtosecond laser

Author

Minoshima, Kaoru and Matsumoto, Hirokazu

Subjects
Lasers -- Testing, Optics -- Research, Astronomy, Physics
Abstract

A high-accuracy optical distance meter with a mode-locked femtosecond laser is proposed for distance measurements in a 310-m-long optical tunnel. We measured the phase shift of the optical beat component between longitudinal modes of a mode-locked laser. A high resolution of 50 [micro]m at 240-m distance was obtained without cyclic error correction. The group refractive index of air is automatically extracted to an accuracy of 6 parts per million (ppm) by two-color measurement with the pulses of fundamental and second-harmonic wavelengths. Finally, an absolute mechanical distance of 240 m was obtained to within 8-ppm accuracy by use of a series of beat frequencies with the advantage of a wide range of intermode frequency, together with the results of the two-color measurement. [C] 2000 Optical Society of America OCIS codes: 140.4050, 320.7160, 140.3510, 280.3400.

Published
2000

184. Three-dimensional shape measurement of a diffusing surface by use of a femtosecond amplifying optical Kerr gate

Author

Yasui, Takeshi, Minoshima, Kaoru, and Matsumoto, Hirokazu

Subjects
Optoelectronics -- Research, Three-dimensional display systems -- Analysis, Imaging systems -- Analysis, Astronomy, Physics
Abstract

We propose a system for three-dimensional (3D) shape measurement of a diffusing surface by use of a previously developed femtosecond amplifying optical Kerr gate (fs-amp OKG). The system has an opening time of 459 fs and a maximum transmittance of 185%. It also provides good 3D imaging performance: a transverse imaging resolution of 70 [micro]m, a depth resolution of 100 [micro]m, and a positioning accuracy of 5.9 [micro]m in depth. It is found that the optical Kerr effect and the amplification process in the fs-amp OKG do not cause the quality of a time-resolved image to deteriorate. We prove the effectiveness of the proposed system by measuring the shapes of completely diffusing objects with stepped and spherical surfaces. [C] 2000 Optical Society of America OCIS codes: 170.6920, 170.7160, 110.6880, 190.4360, 120.6650, 120.6660.

Published
2000

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