Dr. Meguru Ito Profile

Dr. Meguru Ito

at Subaru Telescope NAOJ

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 25 September 2012 Paper

Paper

Status of the Raven MOAO science demonstrator

David Andersen, C. Bradley, O. Lardière, C. Blain, C. Correia, R. Desmarais, D. Gamroth, M. Ito, K. Jackson, P. Lach, R. Nash, L. Pham, J.-P. Véran

Proceedings Volume 8447, 84473F (2012) https://doi.org/10.1117/12.926854

KEYWORDS: Adaptive optics, Copper, Mirrors, Real-time computing, Calibration, Cameras, Telescopes, Stars, Tomography, Actuators

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Proceedings Article | 13 September 2012 Paper

Paper

Final opto-mechanical design of Raven, a MOAO science demonstrator for Subaru

Olivier Lardière, Reston Nash, J.-P. Markes, Dave Andersen, Colin Bradley, Célia Blain, Ronald Desmarais, Darryl Gamroth, Meguru Ito, Kate Jackson, Przemek Lach, Laurie Pham

Proceedings Volume 8447, 844753 (2012) https://doi.org/10.1117/12.927176

KEYWORDS: Mirrors, Telescopes, Copper, Relays, Cameras, Calibration, Adaptive optics, Monochromatic aberrations, Distortion, Photovoltaics

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Proceedings Article | 13 September 2012 Paper

Paper

Subaru laser guide adaptive optics system: performance and science operation

Yosuke Minowa, Yutaka Hayano, Hiroshi Terada, Tae-Soo Pyo, Shin Oya, Masayuki Hattori, Mai Shirahata, Hideki Takami, Olivier Guyon, Vincent Garrel, Stephen Colley, Mark Weber, Taras Golota, Makoto Watanabe, Yoshihiko Saito, Meguru Ito, Masanori Iye

Proceedings Volume 8447, 84471F (2012) https://doi.org/10.1117/12.925543

KEYWORDS: Stars, Telescopes, Laser guide stars, Adaptive optics, Space telescopes, Mirrors, K band, Wavefront sensors, Cameras, Imaging spectroscopy

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Proceedings Article | 29 July 2010 Paper

Paper

The characteristics of laser-transmission and guide star's brightness for Subaru LGS/AO188 system

M. Ito, Y. Hayano, Y. Saito, H. Takami, M. Iye, M. Hattori, S. Oya, M. Watanabe, K. Akagawa, S. Colley, T. Golota, O. Guyon

Proceedings Volume 7736, 773651 (2010) https://doi.org/10.1117/12.856341

KEYWORDS: Sodium, Scanning probe microscopy, Laser scattering, Optical fibers, Scattering, Raman scattering, Telescopes, Fiber lasers, Laser guide stars, Pulsed laser operation

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Proceedings Article | 29 July 2010 Paper

Paper

Visible low-order wavefront sensor for the Subaru LGSAO system

Makoto Watanabe, Meguro Ito, Shin Oya, Yutaka Hayano, Yosuke Minowa, Masayuki Hattori, Yoshihiko Saito, Sebastian Egner, Hideki Takami, Masanori Iye, Olivier Guyon, Vincent Garrel, Stephen Colley, Taras Golota

Proceedings Volume 7736, 77365H (2010) https://doi.org/10.1117/12.856845

KEYWORDS: Wavefront sensors, Avalanche photodetectors, Optical fibers, Adaptive optics, Sensors, Mirrors, Stars, Cameras, Laser guide stars, Beam splitters

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Proceedings Article | 29 July 2010 Paper

Paper

The performance of the laser guide star system for the Subaru Telescope

Yoshihiko Saito, Yutaka Hayano, Meguro Ito, Yosuke Minowa, Sebastian Egner, Shin Oya, Makoto Watanabe, Masayuki Hattori, Vincent Garrel, Kazuyuki Akagawa, Olivier Guyon, Stephen Colley, Taras Golota, Norihito Saito, Akira Takazawa, Mayumi Ito, Hideki Takami, Satoshi Wada, Masanori Iye

Proceedings Volume 7736, 773653 (2010) https://doi.org/10.1117/12.856484

KEYWORDS: Telescopes, Fiber lasers, Sodium, Control systems, Laser guide stars, Laser systems engineering, Electroluminescence, Collimation, Mirrors, Diagnostics

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Proceedings Article | 29 July 2010 Paper

Paper

Performance of Subaru adaptive optics system AO188

Yosuke Minowa, Yutaka Hayano, Shin Oya, Makoto Watanabe, Masayuki Hattori, Olivier Guyon, Sebastian Egner, Yoshihiko Saito, Meguro Ito, Hideki Takami, Vincent Garrel, Stephen Colley, Taras Golota, Masanori Iye

Proceedings Volume 7736, 77363N (2010) https://doi.org/10.1117/12.857818

KEYWORDS: Stars, Point spread functions, Adaptive optics, Wavefronts, Telescopes, Wavefront sensors, Mirrors, Sensors, Photon counting, K band

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Proceedings Article | 29 July 2010 Paper

Paper

Tip/tilt offload of Subaru AO188 by telescope secondary mirror

Shin Oya, Masayuki Hattori, Yosuke Minowa, Satoru Negishi, Daigo Tomono, Hiroshi Terada, Tae-Soo Pyo, Makoto Watanabe, Megru Ito, Yoshihiko Saito, Sebastian Egner, Yutaka Hayano, Hideki Takami, Masanori Iye, Olivier Guyon, Vincent Garrel, Stephen Colley, Taras Golota

Proceedings Volume 7736, 77363U (2010) https://doi.org/10.1117/12.857387

KEYWORDS: Telescopes, Mirrors, Adaptive optics, Telecommunications, Secondary tip-tilt mirrors, Infrared telescopes, Digital signal processing, Control systems, Infrared radiation, Data conversion

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Proceedings Article | 29 July 2010 Paper

Paper

Atmospheric dispersion correction for the Subaru AO system

Sebastian Egner, Yuji Ikeda, Makoto Watanabe, Y. Hayano, T. Golota, M. Hattori, M. Ito, Y. Minowa, S. Oya, Y. Saito, H. Takami, M. Iye

Proceedings Volume 7736, 77364V (2010) https://doi.org/10.1117/12.856579

KEYWORDS: Prisms, Atmospheric corrections, Adaptive optics, Atmospheric optics, Atmospheric sciences, Point spread functions, Telescopes, Mechanical engineering, Optical design, Visualization

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Proceedings Article | 29 July 2010 Paper

Paper

Recent development in real-time control system of Subaru adaptive optics including laser guide star mode

Masayuki Hattori, Stephen Colley, Vincent Garrel, Sebastian Egner, Taras Golota, Olivier Guyon, Meguro Ito, Yosuke Minowa, Shin Oya, Yoshihiko Saito, Makoto Watanabe, Yutaka Hayano, Hideki Takami, Masanori Iye

Proceedings Volume 7736, 77364M (2010) https://doi.org/10.1117/12.857710

KEYWORDS: Control systems, Adaptive optics, Laser guide stars, Sensors, Telescopes, Stars, Wavefronts, Control systems design, Sodium, Wavefront sensors

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Proceedings Article | 28 July 2010 Paper

Paper

Commissioning status of Subaru laser guide star adaptive optics system

Yutaka Hayano, Hideki Takami, Shin Oya, Masayuki Hattori, Yoshihiko Saito, Makoto Watanabe, Olivier Guyon, Yosuke Minowa, Sebastian Egner, Meguru Ito, Vincent Garrel, Stephen Colley, Taras Golota, Masanori Iye

Proceedings Volume 7736, 77360N (2010) https://doi.org/10.1117/12.857567

KEYWORDS: Laser guide stars, Telescopes, Stars, Wavefront sensors, Adaptive optics, Mirrors, Wavefronts, Deformable mirrors, Laser systems engineering, Fiber lasers

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Proceedings Article | 20 July 2010 Paper

Paper

Software control and characterization aspects for image derotator of the AO188 system at Subaru

Taras Golota, Shin Oya, Sebastian Egner, Makoto Watanabe, Michael Eldred, Yosuke Minowa, Hideki Takami, David Cook, Yutaka Hayano, Yoshihiko Saito, Masayuki Hattori, Vincent Garrel, Meguru Ito

Proceedings Volume 7735, 77353W (2010) https://doi.org/10.1117/12.857964

KEYWORDS: Telescopes, Control systems, Electroluminescence, Interfaces, Human-machine interfaces, Motion measurement, Distance measurement, Motion controllers, Adaptive optics, Mechanical engineering

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Proceedings Article | 16 July 2010 Paper

Paper

Performance characterization of the HiCIAO instrument for the Subaru Telescope

Ryuji Suzuki, Tomoyuki Kudo, Jun Hashimoto, Joseph Carson, Sebastian Egner, Miwa Goto, Masayuki Hattori, Yutaka Hayano, Klaus Hodapp, Meguro Ito, Masanori Iye, Shane Jacobson, Ryo Kandori, Nobuhiko Kusakabe, Masayuki Kuzuhara, Taro Matsuo, Michael Mcelwain, Jun-Ichi Morino, Shin Oya, Yoshihiko Saito, Richard Shelton, Vern Stahlberger, Hiroshi Suto, Hideki Takami, Christian Thalmann, Makoto Watanabe, Hubert Yamada, Motohide Tamura

Proceedings Volume 7735, 773530 (2010) https://doi.org/10.1117/12.857361

KEYWORDS: K band, Stars, Sensors, Distortion, Telescopes, Planets, Coronagraphy, Speckle pattern, Point spread functions, Adaptive optics

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Proceedings Article | 15 July 2008 Paper

Paper

Implementation of 188-element curvature-based wavefront sensor and calibration source unit for the Subaru LGSAO system

Makoto Watanabe, Shin Oya, Yutaka Hayano, Hideki Takami, Masayuki Hattori, Yosuke Minowa, Yoshihiko Saito, Meguru Ito, Naoshi Murakami, Masanori Iye, Olivier Guyon, Stephen Colley, Michael Eldred, Taras Golota, Matthew Dinkins

Proceedings Volume 7015, 701564 (2008) https://doi.org/10.1117/12.789882

KEYWORDS: Adaptive optics, Calibration, Wavefront sensors, Mirrors, Avalanche photodetectors, Stars, Laser guide stars, Cameras, Telescopes, Optical fibers

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Proceedings Article | 15 July 2008 Paper

Paper

Development of a dichroic beam splitter for Subaru AO188

Yosuke Minowa, Hideki Takami, Makoto Watanabe, Yutaka Hayano, Masaaki Miyake, Masanori Iye, Shin Oya, Masayuki Hattori, Naoshi Murakami, Olivier Guyon, Yoshihiko Saito, Meguru Itoh, Stephen Colley, Matthew Dinkins, Michael Eldred, Taras Golota

Proceedings Volume 7015, 701561 (2008) https://doi.org/10.1117/12.788597

KEYWORDS: Beam splitters, Transmittance, Optical coatings, Thin film coatings, Humidity, Near infrared, Telescopes, Adaptive optics, Thorium, Absorption

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Proceedings Article | 14 July 2008 Paper

Paper

Characterization of vibrating shape of a bimorph deformable mirror

Shin Oya, Yosuke Minowa, Masayuki Hattori, Makoto Watanabe, Yutaka Hayano, Megru Itoh, Yoshihiko Saito, Hideki Takami, Masanori Iye, Olivier Guyon, Stephen Colley, Matthew Dinkins, Michael Eldred, Taras Golota

Proceedings Volume 7015, 70153R (2008) https://doi.org/10.1117/12.789600

KEYWORDS: Deformable mirrors, Adaptive optics, Sensors, Spectrum analysis, Mirrors, Finite element methods, Telescopes, Control systems, Shape analysis, Optical amplifiers

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Proceedings Article | 10 July 2008 Paper

Paper

Current status of the laser guide star adaptive optic system for Subaru Telescope

Yutaka Hayano, Hideki Takami, Olivier Guyon, Shin Oya, Masayuki Hattori, Yoshihiko Saito, Makoto Watanabe, Naoshi Murakami, Yosuke Minowa, Meguru Ito, Stephen Colley, Michael Eldred, Taras Golota, Matthew Dinkins, Nobunari Kashikawa, Masanori Iye

Proceedings Volume 7015, 701510 (2008) https://doi.org/10.1117/12.789992

KEYWORDS: Adaptive optics, Telescopes, Stars, Laser guide stars, K band, Gold vapor lasers, Optical fibers, Waveguides, Sodium, Point spread functions

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Proceedings Article | 12 December 2006 Paper

Paper

Development of all-solid-state coherent 589 nm light source: toward the realization of sodium lidar and laser guide star adaptive optics

Norihito Saito, Kazuyuki Akagawa, Mayumi Kato, Akira Takazawa, Yutaka Hayano, Yoshihiko Saito, Meguru Ito, Hideki Takami, Masanori Iye, Satoshi Wada

Proceedings Volume 6409, 64091H (2006) https://doi.org/10.1117/12.697363

KEYWORDS: Sodium, Mode locking, Nd:YAG lasers, Light sources, Adaptive optics, LIDAR, Nonlinear crystals, Thermal effects, Laser guide stars, Crystals

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Proceedings Article | 28 June 2006 Paper

Paper

Transmission characteristics of high-power 589-nm laser beam in photonic crystal fiber

Meguru Ito, Yutaka Hayano, Norihito Saito, Kazuyuki Akagawa, Mayumi Kato, Yoshihiko Saito, Akira Takazawa, Hideki Takami, Masanori Iye, Satoshi Wada, Stephen Colley, Matthew Dinkins, Michael Eldred, Taras Golota, Olivier Guyon, Masayuki Hattori, Shin Oya, Makoto Watanabe

Proceedings Volume 6272, 627245 (2006) https://doi.org/10.1117/12.671972

KEYWORDS: Polarization, Laser scattering, Scattering, Optical fibers, Raman scattering, Telescopes, Relays, Sodium, Fiber lasers, Light scattering

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We are developing Laser Guide Star Adaptive Optics (LGSAO) system for Subaru Telescope at Hawaii, Mauna Kea. We achieved an all-solid-state 589.159 nm laser in sum-frequency generation. Output power at 589.159 nm reached 4W in quasi-continuous-wave operation. To relay the laser beam from laser location to laser launching telescope, we used an optical fiber because the optical fiber relay is more flexible and easier than mirror train. However, nonlinear scattering effect, especially stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), will happen when the inputted laser power increases, i.e., intensity at the fiber core exceed each threshold. In order to raise the threshold levels of each nonlinear scattering, we adopt photonic crystal fiber (PCF). Because the PCF can be made larger core than usual step index fiber (SIF), one can reduce the intensity in the core. We inputted the high power laser into the PCF whose mode field diameter (MFD) is 14 μm and the SIF whose MFD is 5 μm, and measured the transmission characteristics of them. In the case of the SIF, the SRS was happen when we inputted 2 W. On the other hand, the SRS and the SBS were not induced in the PCF even for an input power of 4 W. We also investigated polarization of the laser beam transmitting through the PCF. Because of the fact that the backscattering efficiency of exciting the sodium layer with a narrowband laser is dependent on the polarization state of the incident beam, we tried to control the polarization of the laser beam transmitted the PCF. We constructed the system which can control the polarization of input laser and measure the output polarization. The PCF showed to be able to assume as a double refraction optical device, and we found that the output polarization is controllable by injecting beam with appropriate polarization through the PCF. However, the Laser Guide Star made by the beam passed through the PCF had same brightness as the state of the polarization.

Proceedings Article | 28 June 2006 Paper

Paper

Performance of the deformable mirror for Subaru LGSAO

Shin Oya, Aurelien Bouvier, Olivier Guyon, Makoto Watanabe, Yutaka Hayano, Hideki Takami, Masanori Iye, Masayuki Hattori, Yoshihiko Saito, Meguru Itoh, Stephen Colley, Matthew Dinkins, Michael Eldred, Taras Golota

Proceedings Volume 6272, 62724S (2006) https://doi.org/10.1117/12.670773

KEYWORDS: Deformable mirrors, Finite element methods, Electrodes, Adaptive optics, Glasses, Ferroelectric materials, Data modeling, Telescopes, Mirrors, Laser optics

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Proceedings Article | 28 June 2006 Paper

Paper

589 nm sum-frequency generation laser for the LGS/AO of Subaru Telescope

Yoshihiko Saito, Yutaka Hayano, Norihito Saito, Kazuyuki Akagawa, Akira Takazawa, Mayumi Kato, Meguru Ito, Stephen Colley, Matthew Dinkins, Michael Eldred, Taras Golota, Olivier Guyon, Masayuki Hattori, Shin Oya, Makoto Watanabe, Hideki Takami, Masanori Iye, Satoshi Wada

Proceedings Volume 6272, 627246 (2006) https://doi.org/10.1117/12.671964

KEYWORDS: Mode locking, Nd:YAG lasers, Laser guide stars, Laser development, Nonlinear crystals, Fiber lasers, Laser systems engineering, Telescopes, Oscillators, Sodium

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Proceedings Article | 28 June 2006 Paper

Paper

The laser guide star facility for Subaru Telescope

Yutaka Hayano, Yoshihiko Saito, Meguru Ito, Norihito Saito, Mayumi Kato, Kazuyuki Akagawa, Akira Takazawa, Stephen Colley, Matthew Dinkins, Michael Eldred, Taras Golota, Olivier Guyon, Masayuki Hattori, Shin Oya, Makoto Watanabe, Hideki Takami, Satoshi Wada, Masanori Iye

Proceedings Volume 6272, 627247 (2006) https://doi.org/10.1117/12.672583

KEYWORDS: Telescopes, Laser guide stars, Adaptive optics, Fiber lasers, Space telescopes, Laser systems engineering, Relays, Astronomy, Photonic crystal fibers, Diagnostics

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Proceedings Article | 27 June 2006 Paper

Paper

Status of Subaru laser guide star AO system

Hideki Takami, Stephen Colley, Matt Dinkins, Michael Eldred, Olivier Guyon, Taras Golota, Masayuki Hattori, Yutaka Hayano, Meguru Ito, Masanori Iye, Shin Oya, Yoshihiko Saito, Makoto Watanabe

Proceedings Volume 6272, 62720C (2006) https://doi.org/10.1117/12.670568

KEYWORDS: Adaptive optics, Laser guide stars, Telescopes, Mirrors, Wavefront sensors, Fiber lasers, Sensors, Avalanche photodetectors, Stars, Laser systems engineering

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Proceedings Article | 27 June 2006 Paper

Paper

Implementation of modal optimization system of Subaru-188 adaptive optics

Masayuki Hattori, Taras Golota, Guyon Olivier, Matthew Dinkins, Shin Oya, Stephen Colley, Michael Eldred, Makoto Watanabe, Meguru Itoh, Yoshihiko Saito, Yutaka Hayano, Hideki Takami, Masanori Iye

Proceedings Volume 6272, 62725G (2006) https://doi.org/10.1117/12.671027

KEYWORDS: Adaptive optics, Wavefronts, Servomechanisms, Optimization (mathematics), Control systems, Telescopes, Mirrors, Error analysis, Stars, Wavefront sensors

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Showing 5 of 24 publications

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