Prof. Moriaki Wakaki Profile

Prof. Moriaki Wakaki

Professor Emeritus at Tokai Univ

SPIE Involvement:

Author

Publications (44)

Proceedings Article | 21 November 2017 Open Access

Open Access

Paper

Grism and immersion grating for space telescope

Noboru Ebizuka, Kiko Oka, Akiko Yamada, Mami Ishikawa, Masako Kashiwagi, Kashiko Kodate, Yasuhiro Hirahara, Shuji Sato, Koji Kawabata, Moriaki Wakaki, Shin-ya Morita, Tomoyuki Simizu, Shaohui Yin, Hitoshi Omori, Masanori Iye

Proceedings Volume 10568, 105681M (2017) https://doi.org/10.1117/12.2308014

KEYWORDS: Diffraction gratings, Diffraction, Prisms, Spectrographs, Refractive index, Spectroscopy, Space telescopes, Germanium, Spectral resolution, Prototyping

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Proceedings Article | 16 March 2015 Paper

Paper

Application of photo-doping phenomenon in amorphous chalcogenide GeS2 film to optical device

Yoshihisa Murakami, Katsuya Arai, Moriaki Wakaki, Takehisa Shibuya, Toshihiro Shintaku

Proceedings Volume 9359, 93591N (2015) https://doi.org/10.1117/12.2078142

KEYWORDS: Silver, Waveguides, Diffraction, Chalcogenides, Diffraction gratings, Optical components, Metals, Doping, Holography, Helium neon lasers

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Proceedings Article | 16 March 2015 Paper

Paper

Optical properties of MgF2 nano-composite films dispersed with noble metal nanoparticles synthesized by sol-gel method

Moriaki Wakaki, Nobuaki Soujima, Takehisa Shibuya

Proceedings Volume 9359, 93590A (2015) https://doi.org/10.1117/12.2077045

KEYWORDS: Nanoparticles, Magnesium fluoride, Silver, Gold, Absorption, Metals, Composites, Sol-gels, Raman spectroscopy, Transmission electron microscopy

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Proceedings Article | 8 March 2014 Paper

Paper

Optical properties of ZnO thin films dispersed with noble metal nanoparticles synthesized by sol-gel method

M. Wakaki, T. Noguchi, E. Yokoyama

Proceedings Volume 8987, 89870F (2014) https://doi.org/10.1117/12.2037556

KEYWORDS: Nanoparticles, Zinc oxide, Silver, Composites, Gold, Particles, Absorption, Annealing, Metals, Thin films

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Proceedings Article | 7 March 2014 Paper

Paper

Quantitative characterization of photodoping phenomena in amorphous chalcogenide GeS2 film

Yoshihisa Murakami, Moriaki Wakaki

Proceedings Volume 8982, 898217 (2014) https://doi.org/10.1117/12.2038390

KEYWORDS: Doping, Silver, Metals, Quantum efficiency, Chalcogenides, Thermal effects, Diffusion, Transmittance, Semiconductor lasers, Absorption

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Proceedings Article | 25 February 2014 Paper

Paper

Development of flying spot illumination system for stage lighting

Hisashi Asakawa, Katsunori Ishii, Hikari Koshiro, Junko Baba, Moriaki Wakaki

Proceedings Volume 9005, 90050H (2014) https://doi.org/10.1117/12.2038147

KEYWORDS: Light emitting diodes, Control systems, Light sources and illumination, Mirrors, Light sources, Light, Camera shutters, LED lighting, LED displays, Modulation

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Proceedings Article | 24 August 2011 Paper

Paper

Optical properties of dielectric films dispersed with metal nanoparticles and applications to optically functional materials

Moriaki Wakaki, Eisuke Yokoyama

Proceedings Volume 8173, 81731G (2011) https://doi.org/10.1117/12.899589

KEYWORDS: Nanoparticles, Silver, Gold, Absorption, Zirconium dioxide, Metals, Diffraction, Visible radiation, Ultraviolet radiation, Titanium dioxide

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Proceedings Article | 25 March 2011 Paper

Paper

Patterning of indium-tin-oxide (ITO) films using laser-induced forward transfer (LIFT) technique

Hironobu Sakata, Akira Yoshikado, Eisuke Yokoyama, Moriaki Wakaki

Proceedings Volume 7940, 794011 (2011) https://doi.org/10.1117/12.873058

KEYWORDS: Glasses, Receivers, Nd:YAG lasers, Scanning electron microscopy, Optical lithography, Second-harmonic generation, Tin, Laser ablation, Q switched lasers, Mirrors

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Proceedings Article | 23 February 2011 Paper

Paper

Study on photodoping properties for the multilayered films GeS2/Ag/GeS2 and Ag/GeS2/Ag

Yoshihisa Murakami, Takahiro Iijima, Moriaki Wakaki

Proceedings Volume 7934, 793412 (2011) https://doi.org/10.1117/12.873269

KEYWORDS: Doping, Silver, Metals, Multilayers, Laser irradiation, Diffusion, Transmittance, Chalcogenides, Chalcogenide glass, Interfaces

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Proceedings Article | 23 February 2011 Paper

Paper

Dielectric analysis on optical properties of ZrO2 thin films dispersed with silver nanoparticles prepared by sol-gel method

Moriaki Wakaki, Eisuke Yokoyama

Proceedings Volume 7934, 793411 (2011) https://doi.org/10.1117/12.873259

KEYWORDS: Silver, Nanoparticles, Absorption, Composites, Zirconium dioxide, Dielectrics, Particles, Thin films, Sol-gels, Surface plasmons

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Proceedings Article | 14 February 2011 Paper

Paper

Laser processing and monitoring of Ag photodoped patterns in GeS2 amorphous films by dual functional laser scanning micro-processing/micro-scope system utilizing UV/VIS confocal laser scanning microscope

Yoshikazu Kanai, Yoshihisa Murakami, Moriaki Wakaki, Norihide Takeyama

Proceedings Volume 7927, 792714 (2011) https://doi.org/10.1117/12.874310

KEYWORDS: Silver, Laser scanners, Doping, Diffraction, Laser systems engineering, Diffraction gratings, Ultraviolet radiation, Microscopes, Laser processing, Geometrical optics

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Proceedings Article | 18 February 2009 Paper

Paper

Study on calcifying treatments of hydroxyapatite (HAp) using calcifying promotion solution

Moriaki Wakaki, Syungo Yazaki, Yoshikazu Sunada

Proceedings Volume 7162, 71620S (2009) https://doi.org/10.1117/12.808487

KEYWORDS: Raman spectroscopy, Image processing, Scanning electron microscopy, Apatite, Liquids, Teeth, Calcium, Chemical elements, Reflection, Bone

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Proceedings Article | 3 February 2009 Paper

Paper

Development of luminaires using high power color LEDs and application to lighting system for color hologram

Moriaki Wakaki, Takehisa Shibuya, Junko Baba, Hisashi Asakawa

Proceedings Volume 7232, 723211 (2009) https://doi.org/10.1117/12.808478

KEYWORDS: Holograms, Light emitting diodes, 3D image reconstruction, Light sources, Halogens, Lamps, Light sources and illumination, LED lighting, General lighting, Light

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Proceedings Article | 21 July 2008 Paper

Paper

Fabrication of the GaAs based terahertz photoconductors and the photometer for Tera-GATE

Kentaroh Watanabe, Kyouhei Yamashita, Hirokazu Kataza, Takafumi Kamizuka, Takehiko Wada, Moriaki Wakaki, Osamu Abe, Hiroshi Murakami

Proceedings Volume 7020, 702020 (2008) https://doi.org/10.1117/12.789143

KEYWORDS: Gallium arsenide, Photoresistors, Sensors, Liquid phase epitaxy, Telescopes, Astronomy, Photons, Crystals, Tellurium, Selenium

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Proceedings Article | 4 January 2008 Paper

Paper

GaAs extrinsic photoconductors for the terahertz astronomy

Kentaroh Watanabe, Kyouhei Yamashita, Hidekazu Kitagawa, Moriaki Wakaki, Osamu Abe, Hiroshi Murakami

Proceedings Volume 6840, 68401F (2008) https://doi.org/10.1117/12.757656

KEYWORDS: Gallium arsenide, Photoresistors, Sensors, Liquid phase epitaxy, Astronomy, Tellurium, Crystals, Selenium, Ionization, Metals

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Proceedings Article | 20 December 2007 Paper

Paper

Damage characteristics at optical fiber connector for high power light transmission

S. Matsuda, T. Shibuya, M. Wakaki

Proceedings Volume 6720, 67200K (2007) https://doi.org/10.1117/12.752817

KEYWORDS: Connectors, Optical fibers, Nickel, Zirconium dioxide, Metals, Transmittance, Light sources, Contamination, Adhesives, High power lasers

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In the field of optical communication, either fusion splicing of optical fibers or physical contact between optical-fibers using a fiber connector has been utilized as the typical method of optical fiber connection. Optical fiber connectors have been widely employed in optical transmission systems according to their features of easy and quick connection without special apparatus to connect fibers. The power of laser diodes for light sources became more intense and the multiplexing of wavelength (WDM) of a light source was enhanced with increasing traffic data. As a result, intense light transmits through the optical fiber. The high power transmission characteristics of the optical fiber connector are important factors to realize dense wavelength division multiplexing systems (DWDM). In this paper, we present an experimental investigation about the degradation of the transmission properties through the optical fiber connector by introducing the contamination between the end faces of a connector. The metal foils to simulate the contamination at the end of the core were inserted between the optical fibers to cover the core of an optical fiber partially. As metal foils, Nickel, SUS304, and Phosphor Bronze which were typically used as the components of the ferrule and sleeve were selected. The Nd: YAG laser with the wavelength of 1064 nm was used as a high power light source at various output powers. The transmission loss was set by adjusting the insertion of a metal foil into the core region of the fiber and the temperature rising of the connector induced by the absorption of incident light was measured at a sleeve portion. The damage at the end face of the physical contact region was observed using an optical microscope. The temperatures increase of the core of the fiber was estimated for the fiber connector with a zirconia ferrule through the thermal simulation using the MSC Visual Nastran. The damage of the fiber end face was recognized depending on the species of the metal foil and the covering ratio for the core in the case of a high power light transmission, typically, with the average power of 1W. It was estimated that the damage threshold of the fiber end becomes low for the ferrule with lower melting point. The correlation between the damage threshold and various parameters was discussed.

Proceedings Article | 20 February 2007 Paper

Paper

Development of lighting system for hologram using high power LEDs

Junko Baba, Asami Yaeda, Hisashi Asakawa, Takehisa Shibuya, Moriaki Wakaki

Proceedings Volume 6488, 64880Z (2007) https://doi.org/10.1117/12.698965

KEYWORDS: Holograms, Light emitting diodes, 3D image reconstruction, Halogens, Lamps, Light sources, Light sources and illumination, Blue light emitting diodes, Photometry, Green light emitting diodes

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Proceedings Article | 20 February 2007 Paper

Paper

Characterization of light scattering and film structure of TiO2 thin film

H. Murotani, T. Kudo, M. Wakaki

Proceedings Volume 6469, 646910 (2007) https://doi.org/10.1117/12.699471

KEYWORDS: Air contamination, Light scattering, Thin films, Scanning electron microscopy, Integrating spheres, Spectrophotometry, Calibration, Transmittance, Coating, Ion beams

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Proceedings Article | 13 February 2007 Paper

Paper

Development of light distribution controllable luminaire using high-power LEDs

Hisashi Asakawa, Junko Baba, Asami Yaeda, Moriaki Wakaki

Proceedings Volume 6486, 648611 (2007) https://doi.org/10.1117/12.698914

KEYWORDS: Light emitting diodes, Light sources and illumination, Halogens, Lamps, Light sources, Lenses, Zoom lenses, Light, Imaging systems, Projection systems

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Proceedings Article | 9 February 2007 Paper

Paper

Time dependence of internal stress and optical characteristics of SiO2 optical thin film

Hiroshi Murotani, Kentaro Arai, Moriaki Wakaki

Proceedings Volume 6469, 646905 (2007) https://doi.org/10.1117/12.699462

KEYWORDS: Thin films, Vacuum deposition, Infrared radiation, Ion beams, Reflection, Ions, Scanning electron microscopy, Coating, Optical components, Silicon

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Proceedings Article | 24 August 2005 Paper

Paper

Design and development of multifunctional confocal laser scanning microscope with UV/VIS laser source

Yoshikazu Kanai, Yousuke Kanzaki, Moriaki Wakaki, Norihide Takeyama

Proceedings Volume 5878, 58781D (2005) https://doi.org/10.1117/12.616637

KEYWORDS: Ultraviolet radiation, Objectives, Lens design, Microscopes, Laser scanners, Optical design, Confocal microscopy, Mirrors, Luminescence, Light sources

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Proceedings Article | 22 August 2005 Paper

Paper

Development of laser scissors for carbon and silicon carbide fiber cutting

Hiroshi Murotani, Hironobu Sakata, Akira Yoshikado, Moriaki Wakaki

Proceedings Volume 5869, 58691G (2005) https://doi.org/10.1117/12.618118

KEYWORDS: Silicon carbide, Fiber lasers, Laser cutting, Carbon, Laser irradiation, Beam splitters, Laser ablation, Scanning electron microscopy, Laser development, Glasses

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Proceedings Article | 23 March 2005 Paper

Paper

Application of laser Raman spectroscopy to dental diagnosis

Takahiro Izawa, Moriaki Wakaki

Proceedings Volume 5687, (2005) https://doi.org/10.1117/12.590211

KEYWORDS: Raman spectroscopy, Teeth, Dental caries, Luminescence, Spectroscopy, Ions, In vivo imaging, Laser spectroscopy, Mouth, Calcium

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Proceedings Article | 8 October 2004 Paper

Paper

Fabrication of microlens using CO2laser

Hiroshi Murotani, Kenji Nakamoto, Hideo Fukumoto, Moriaki Wakaki

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596304

KEYWORDS: Microlens, Glasses, Carbon dioxide lasers, Laser irradiation, Scanning electron microscopy, Laser energy, Microlens array, Optical components, Annealing, Carbon monoxide

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Proceedings Article | 8 October 2004 Paper

Paper

Development of GaAs photoconductors for far-infrared/submillimeter astronomy

Kentaroh Watanabe, Hiroshi Murakami, Takuro Ohata, Moriaki Wakaki, Osamu Abe

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.551053

KEYWORDS: Sensors, Gallium arsenide, Liquid phase epitaxy, Photoresistors, Crystals, Photons, Astronomy, Electrons, Sensor performance, Quantum efficiency

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Proceedings Article | 29 September 2004 Paper

Paper

Fabrication of microlens using CO2 laser and characterization of formation process

Hiroshi Murotani, Moriaki Wakaki, Shuichi Kawabata, Kenji Nakamoto

Proceedings Volume 5525, (2004) https://doi.org/10.1117/12.560369

KEYWORDS: Microlens, Glasses, Gas lasers, Carbon monoxide, Laser irradiation, Helium neon lasers, Ellipsometry, Scanning electron microscopy, Laser energy, Sensors

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Proceedings Article | 29 June 2004 Paper

Paper

Multi-imaging hologram for physics education in university and college

Takehisa Shibuya, Toshinori Kimura, Toshiharu Sumi, Shotaro Tada, Huang Iju, Hidetoshi Katsuma, Moriaki Wakaki

Proceedings Volume 5290, (2004) https://doi.org/10.1117/12.526552

KEYWORDS: Holograms, Holography, 3D image reconstruction, Image acquisition, 3D image processing, Physics, Beam splitters, Image storage, Helium neon lasers, Mirrors

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Proceedings Article | 26 November 2003 Paper

Paper

Holography for physics education in universities and colleges

Hidetoshi Katsuma, Toshinori Kimura, Takehisa Shibuya, Moriaki Wakaki

Proceedings Volume 5243, (2003) https://doi.org/10.1117/12.511230

KEYWORDS: Holography, Holograms, Data storage, Physics, Digital recording, Diffraction, Compact discs, Beam splitters, Visualization, Magnetism

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Proceedings Article | 19 November 2003 Paper

Paper

Observation of the dynamic behavior of liquid crystals using T-FDP (Transmission type Four Detectors Polarimeter)

Shuichi Kawabata, Junichi Arizi, Takehisa Shibuya, Moriaki Wakaki

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.524008

KEYWORDS: Liquid crystals, Polarization, Sensors, Stanford Linear Collider, Polarimetry, Optical spheres, Molecules, Calibration, Signal processing, Data acquisition

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Proceedings Article | 19 November 2003 Paper

Paper

Preparation of Cr: Al2O3 ceramics with low scattering loss

Hiroshi Murotani, Moriaki Wakaki, Shuichi Kawabata

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.531214

KEYWORDS: Ceramics, Ruby, Crystals, Chromium, Scattering, Laser crystals, Luminescence, Ions, Absorption, Laser scattering

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Proceedings Article | 4 June 2003 Paper

Paper

Holography for physics education using a simple optical setup

Hidetoshi Katsuma, Takehisa Shibuya, Moriaki Wakaki, Hiromichi Matsumoto

Proceedings Volume 5005, (2003) https://doi.org/10.1117/12.473810

KEYWORDS: Holography, Holograms, Physics, Cameras, Semiconductor lasers, Mirrors, Laser optics, Glasses, Fiber lasers, Camera shutters

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Proceedings Article | 30 January 2003 Paper

Paper

Development of immersion grating for mid-infrared high-dispersion spectrograph for the 8.2-m Subaru telescope

Noboru Ebizuka, Shin-ya Morita, Tomoyuki Shimizu, Yutaka Yamagata, Hitoshi Omori, Moriaki Wakaki, Hideomi Kobayashi, Hitoshi Tokoro, Yasuhiro Hirahara

Proceedings Volume 4842, (2003) https://doi.org/10.1117/12.457402

KEYWORDS: Diffraction gratings, Germanium, Spectrographs, Wavefronts, Diffraction, Telescopes, Mid-IR, Spectral resolution, Prototyping, Solids

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Proceedings Article | 27 November 2002 Paper

Paper

Holography for physics education in university and college

Takehisa Shibuya, Hidetoshi Katsuma, Moriaki Wakaki

Proceedings Volume 4864, (2002) https://doi.org/10.1117/12.454901

KEYWORDS: Holograms, Holography, Cameras, 3D image reconstruction, Physics, Laser optics, Semiconductor lasers, 3D image processing, Mirrors, Light sources

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Proceedings Article | 17 September 2002 Paper

Paper

Optical characterization of Al2O3 films doped with transition elements at various concentrations

Hiroshi Murotani, Moriaki Wakaki, Daisuke Mochida

Proceedings Volume 4918, (2002) https://doi.org/10.1117/12.483081

KEYWORDS: Transition metals, Doping, Chemical elements, Optical amplifiers, Vacuum deposition, Active optics, Cobalt, Optical components, Chromium, Electron beams

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Proceedings Article | 12 September 2002 Paper

Paper

Maskless patterning characteristics of vanadium pentoxide amorphous films by frequency-doubled Q-seitched Nd:YAG laser irradiation

Moriaki Wakaki, Ryuzaburo Nakao, Hironobu Sakata, Takehisa Shibuya, Akira Yoshikado

Proceedings Volume 4915, (2002) https://doi.org/10.1117/12.482906

KEYWORDS: Glasses, Laser irradiation, Scanning electron microscopy, Optical lithography, Vanadium, Nd:YAG lasers, Pulsed laser operation, Atomic force microscopy, Q switched lasers, Second-harmonic generation

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Proceedings Article | 25 February 2002 Paper

Paper

Laser thinning of the thickness of a-GeS2 films

Shuichi Kawabata, Yoshihisa Murakami, Yasunori Ozawa, Moriaki Wakaki

Proceedings Volume 4426, (2002) https://doi.org/10.1117/12.456864

KEYWORDS: Glasses, Chalcogenide glass, Refractive index, Helium neon lasers, Ellipsometry, Laser beam diagnostics, Germanium, Reflection, Thin films, Oxides

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Proceedings Article | 25 February 2002 Paper

Paper

Fabrication of microlenses and microlens arrays using local melting of glass plate by CO2 laser

Moriaki Wakaki, Yuichi Komachi, Genichi Kanai, Hideo Fukumoto, Shuichi Kawabata

Proceedings Volume 4426, (2002) https://doi.org/10.1117/12.456867

KEYWORDS: Microlens, Glasses, Carbon dioxide lasers, Microlens array, Carbon monoxide, Gas lasers, Aspheric lenses, Laser applications, Laser processing, Laser cutting

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Proceedings Article | 4 June 2001 Paper

Paper

Optical characterization of BGO and BSO film for image recording

Kenji Isshin, Hayato Nagase, Hiroshi Murotani, Takehisa Shibuya, Hiroshi Yoshida, Hidetoshi Katsuma, Moriaki Wakaki

Proceedings Volume 4296, (2001) https://doi.org/10.1117/12.429477

KEYWORDS: Crystals, Glasses, Image acquisition, Diffraction, Holography, Sputter deposition, Image processing, Thin films, Argon ion lasers, Ion lasers

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Proceedings Article | 17 March 2000 Paper

Paper

Fabrication of BGO and BSO films for image recording

Hiroshi Murotani, Takehisa Shibuya, Moriaki Wakaki, Hidetoshi Katsuma, Hideshi Yokota

Proceedings Volume 3956, (2000) https://doi.org/10.1117/12.380019

KEYWORDS: Crystals, Holography, Absorption, Diffraction, Temperature metrology, X-ray diffraction, Image acquisition, Image processing, Crystallography, Sputter deposition

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Proceedings Article | 26 July 1999 Paper

Paper

GaAs photoconductors for submillimeter astronomy: liquid phase epitaxial growth of GaAs layers

Osamu Abe, Hiroshi Murakami, Yoshihiko Okamura, Moriaki Wakaki, Taisuke Yakawa, Masayasu Koyama, Tsutomu Ogawa

Proceedings Volume 3698, (1999) https://doi.org/10.1117/12.354563

KEYWORDS: Gallium arsenide, Sensors, Crystals, Astronomy, Liquid phase epitaxy, Photoresistors, Liquids, Luminescence, Oxygen, Photodetectors

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Proceedings Article | 9 July 1998 Paper

Paper

Development of high-dispersion grisms and immersion gratings for spectrographs of the Subaru Telescope

Noboru Ebizuka, Masanori Iye, Toshiyuki Sasaki, Moriaki Wakaki

Proceedings Volume 3355, (1998) https://doi.org/10.1117/12.316818

KEYWORDS: Spectrographs, Crystals, Zinc, Refractive index, Crystal optics, Prisms, Astronomy, Geometrical optics, Spectral resolution, Excimer lasers

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Proceedings Article | 1 September 1996 Paper

Paper

Fabrication of infrared interferometer and its application for characterization of Ge

Moriaki Wakaki

Proceedings Volume 2778, 27783T (1996) https://doi.org/10.1117/12.2299019

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Proceedings Article | 16 August 1996 Paper

Paper

Characterization of the polarization properties of a laser output from a CO2 laser with a special intracavity mirror

Moriaki Wakaki, Hiroo Motegi, Yuichi Komachi, Genichi Kanai

Proceedings Volume 2873, (1996) https://doi.org/10.1117/12.246181

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Proceedings Article | 16 August 1996 Paper

Paper

In-situ ellipsometric study of the phenomenon of photodoping of Ag metal into a-As2S3 film

Shuichi Kawabata, Yuka Miyanishi, Tsumoto Ogawa, Moriaki Wakaki

Proceedings Volume 2873, (1996) https://doi.org/10.1117/12.246239

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Showing 5 of 44 publications

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