Yutaka Tsuchiya

Nagasaki Medical Center

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i-10 index

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Document Type

Co-Authors

S. Aoshima

Nara Institute of Science and Technology

Tsuneyuki Urakami

University of Shizuoka

H. Takahashi

Nagoya University

E. Inuzuka

Hamamatsu Photonics (Japan)

Yutaka Yamashita

Hamamatsu Photonics (Japan)

Yoshihiro Takiguchi

Hiroshima Prefectural Rehabilitation Center

Motoki Oda

Hamamatsu Photonics (Japan)

Shinji Ohsuka

Hamamatsu Photonics (Japan)

Masatoshi Fujimoto

Hamamatsu Photonics (Japan)

Kentaro Kinoshita

Tokyo University of Science

Cooperative Institutions

Hamamatsu Photonics (Japan)

104

The University of Tokyo

100

Osaka University

Kyoto University

Nagoya University

Tohoku University

Keio University

Hokkaido University

Hamamatsu Photonics (United Kingdom)

Japan Science and Technology Agency

Author Statistics

Papers

Citation

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Quantitation of Absorbers in Turbid Media Using Time-Integrated Spectroscopy Based on Microscopic Beer-Lambert Law

Japanese Journal of Applied Physics (1998)

Hedong Zhang Mitsuharu Miwa Yutaka Yamashita Yutaka Tsuchiya

Based on the microscopic Beer-Lambert law, two practical time-integrated spectroscopy (TIS) methods, called dual-wavelength spectroscopy method, and dual-wavelength and dual-site spectroscopy method, are described to determine the absolute concentration of an absorber in variously shaped turbid media. We demonstrate, for the first time, the validity of the TIS methods by means of experiments in which the absolute concentrations of an absorber in a tissue-like phantom were determined with errors less than several percent. The advantages and disadvantages of both methods are also discussed.

Beer–Lambert law

10.1143/jjap.37.2724

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Citations (8)

All solid-state Cr:LiSAF laser

IEEE Transactions on Instrumentation and Measurement (1995)

S. Aoshima H. Itoh Kazuyoshi Kuroyanagi Yoshihiro Takiguchi Y. Ohbayashi

Many kinds of experiments about all solid-state Cr:LiSAF lasers have been reported. A tunable all solid-state cw laser having tunability over more than 100 nm was developed by using the spectrum selection self-injection locking (SSSIL) method in 1992. The authors realize tunable picosecond radiation from an all solid-state laser with 146-200 ps pulses in an 88 nm range. Also, 70 fs pulse generation was achieved using a Kerr-lens mode-locking pumped with an Ar/sup +/ laser.< >

Picosecond

Solid-state laser

10.1109/19.414509

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Citations (3)

Quantitation of absorbing substances in turbid media such as human tissues based on the microscopic Beer-Lambert law

Optics Communications (1997)

Yutaka Tsuchiya Tsuneyuki Urakami

Beer–Lambert law

Slab

Transmission coefficient

10.1016/s0030-4018(97)00469-0

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Citations (16)

Visualization of ultrafast dynamics of laser pulse propagation in the atmosphere using a novel measurement method: FTOP (femtosecond time-resolved optical polarigraphy)

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2000)

S. Aoshima Masayuki Fujimoto Masahiro Hosoda Yutaka Tsuchiya

In the field of laser processing, it is important to monitor the beam quality such as the spatial- and time-distribution. A novel time-resolved imaging technique named FTOP (Femtosecond Time-resolved Optical Polarigraphy) for visualizing the ultrafast propagation dynamics of intense light pulses in a medium has been proposed and demonstrated. FTOP is used to monitor the 3D intensity distribution of the pump pulse focused in a medium by the probe pulse. Femtosecond snapshot images can be created with a high spatial resolution by imaging only the polarization components of the probe pulse; these polarization components change due to the instantaneous birefringence induced by the pump pulse in the medium. Ultrafast temporal changes in the 2D spatial distribution of the optical pulse intensity were clearly visualized in consecutive images by changing the delay between the pump and probe. We observe that several filaments appear and then come together before the vacuum focus due to nonlinear effects in air. We also prove that filamentation dynamics such as the formation position and the propagation behavior are complex and are strongly affected by the pump energy. The results collected clearly show that this method FTOP succeeds for the first time in directly visualizing the ultrafast dynamics of the self- modulated nonlinear propagation of light.

Filamentation

Temporal resolution

10.1117/12.376997

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Citations (3)

Energetic Proton and Deuteron Generation from a Microporous Polytetrafluoroethylene Film with Deuterated Polystyrene using a 2.4-TW Table-Top Laser

Springer series in chemical physics (2005)

H. Takahashi S. Okihara Shinji Ohsuka Masayuki Fujimoto Shigetoshi Okazaki

Polystyrene

Polytetrafluoroethylene

10.1007/3-540-27213-5_68

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Citations (1)

Measurements of ultrashort optical pulses by streak cameras.

The Review of Laser Engineering (1987)

Yutaka Tsuchiya

Recent measuring technology for various types of ultrashort optical pulses using ultrafast streak cameras and optical oscilloscopes are reviewed. The optical oscilloscope is a conceptually new electron-optical instrument, in which two advanced technologies: streak camera and oscilloscope, are combined in one unit.

Streak camera

Streak

10.2184/lsj.15.896

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Citations (1)

Short Cavity All-Solid-State Femtosecond Cr:LiSAF Laser

Japanese Journal of Applied Physics (1997)

Haruyasu Itoh S. Aoshima Makoto Hosoda Makoto Hosoda Yutaka Tsuchiya

We demonstrate a very short-cavity, all-solid-state Kerr-lens mode-locked Cr 3+ :LiSrAlF 6 laser using various materials of intracavity prisms for dispersion compensation. The minimum size of the laser cavity was 25 ×16 cm using on F8 prism pair material, and almost transform-limited 143 fs pulses were generated at a repetition rate of 262 MHz, which is the smallest femtosecond laser in the world to our knowledge. Changes in the cavity size and pulse repetition rate by changing the prism materials were examined, and the laser was able to generate almost transform-limited pulses shorter than 150 fs in the repetition rate range of 210–262 MHz.

Prism

Repetition (rhetorical device)

Solid-state laser

10.1143/jjap.36.6380

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Citations (1)

Full‐color reflective liquid‐crystal display using internal‐reflection inverted‐scattering (IRIS) mode

Journal of the Society for Information Display (1999)

Takeshi Sonehara Masayuki Yazaki H. Iisaka Yutaka Tsuchiya Haruo Sakata

Abstract— We developed a bright full‐color reflective LCD which employs a newly developed IRIS mode, a scattering PDLC, and a MIM active matrix with two processes. The full‐color IRIS LCD provides high efficiency for ambient light and good color representation characteristics for battery‐driven low‐power applications.

IRIS (biosensor)

Reflection

Mode (computer interface)

Backlight

10.1889/1.1985266

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Citations (0)

Reconstructed images for oxy and deoxy hemoglobin for a phantom with varied local oxygenation using optical CT

Advances in Optical Imaging and Photon Migration (1998)

Ichiro Oda Hideo Eda Yasunobu Ito Yukio Oikawa Yukihisa Wada

Get PDF Email Share Share with Facebook Share on X Post on reddit Share with LinkedIn Add to Mendeley Add to BibSonomy Share with WeChat Get Citation Copy Citation Text I. Oda, H. Eda, Y. Ito, Y. Oikawa, Y. Wada, Y. Tsunazawa, M. Oda, K. Ohta, Y. Yamashita, and Y. Tsuchiya, "Reconstructed images for oxy and deoxy hemoglobin for a phantom with varied local oxygenation using optical CT," in Advances in Optical Imaging and Photon Migration, J. Fujimoto and M. Patterson, eds., Vol. 21 of OSA Trends in Optics and Photonics (Optica Publishing Group, 1998), paper ATuB4. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Optical density

10.1364/aoipm.1998.atub4

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Citations (0)

Saturation of multiplication mechanism in silicon avalanche photodiodes used for single electron detection

Review of Scientific Instruments (1998)

Nobuyuki Osakabe Junji Endo Akira Tonomura Tsuneyuki Urakami Shinji Ohsuka

We have examined the multiplication factor of silicon avalanche photodiodes designed for fast timing detection of monoenergetic electrons. The multiplication mechanism was found to be saturated. The highly concentrated space charge generated by a primary electron causes the saturation. This was confirmed by a Monte Carlo simulation of electron trajectories in silicon and an experiment exploiting a subpicosecond laser pulse with a variable illuminating spot size to simulate an electron bombardment.

Photodiode

Saturation (graph theory)

Single-photon avalanche diode

10.1063/1.1149030

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Citations (4)