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Dive into the research topics where Koji Takasaki is active.

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Featured researches published by Koji Takasaki.


Japanese Journal of Applied Physics | 2005

Line Segment Hologram Writer Using Single-Mode Blue Laser and One-Dimensional Spatial Light Modulator

Koji Takasaki; Shigeo Kobayashi; Mikio Sugiki; Kenjiro Watanabe

We have developed a holographic writer using a one-dimensional spatial light modulator and a single-mode blue laser. This writer has the potential of achieving a 5 µm pitch phase correlation multiplexing.


2006 Optical Data Storage Topical Meeting | 2006

Optical System Designed for Coaxial Holographic Recording on Continuously Rotating Disc

Koji Takasaki; Kazuyuki Hirooka; Shigeo Kobayashi; Hitoshi Okada; Shigeru Akao; Satoru Seko; Atsushi Fukumoto; Mikio Sugiki; Kenjiro Watanabe

This study introduces the specified objective lens and the new image position servo system to the coaxial holographic recording system. The validity of these technologies is verified analytically and experimentally


2009 Optical Data Storage Topical Meeting | 2009

Development of a coaxial-type holographic disk system with a small drive

Koji Takasaki; Hidenori Mori; Shinji Yamada; Tatsuo Hori; Kazuyuki Hirooka; Hitoshi Okada; Kazutatsu Tokuyama; Masaaki Hara; Satoru Seko; Atsushi Fukumoto; Kanzo Okada

We have developed a coaxial-type holographic disk system with a small drive. We achieved stable operation without use of a vibration-isolating table, with a 91-Mbps data-transfer rate for recording and retrieving using LDPC code.


Optical Data Storage (2007), paper WDPDP2 | 2007

High-Speed Data Recording and Retrieving Using the Image-Stabilizing Technique in a Coaxial Holographic Disk System

Koji Takasaki; Kazuyuki Hirooka; Takahiro Takeda; Tatsuo Hori; Hitoshi Okada; Masaaki Hara; Kazutatsu Tokuyama; Shinji Yamada; Satoru Seko; Atsushi Fukumoto; Kenjiro Watanabe

107 Mbps and 92 Mbps data-transfer rates for recording and retrieving, respectively, have been achieved by improving the coaxial holographic disk system using the IS technique.


2006 Optical Data Storage Topical Meeting | 2006

Development of a Coaxial type Holographic Disc Data Storage Evaluation System, Capable of 500-fps-Consecutive Writing and Reading

Kazuyuki Hirooka; Koji Takasaki; Shigeo Kobayashi; Hitoshi Okada; Shigeru Akao; Satoru Seko; Atsushi Fukumoto; Mikio Sugiki; Kenjiro Watanabe

A coaxial type holographic data storage evaluation system, capable of 500-fps-consecutive writing and reading, has been developed, whose light source is a semiconductor blue laser diode. This is realized by an image-stabilizing technique.


2009 Optical Data Storage Topical Meeting | 2009

Experimental verification of coherent addition technique in coaxial holographic storage

Kenji Tanaka; Masaaki Hara; Kazutatsu Tokuyama; Koji Takasaki; Hitoshi Okada; Yoshiki Okamoto; Hidenori Mori; Atsushi Fukumoto; Kanzo Okada

We have experimentally evaluated the coherent addition technique, and revealed that the coherent addition can enhance detected data intensity and realize clear three-level data retrieving. Moreover, we have achieved great improvements in the multiplexed performance, which are the SNR gain of +3.5 dB and the data density increase with the factor of 2. We consider that this technique will strongly contribute to future holographic technologies.


Archive | 2005

Hologram recording/reproducing device and optical unit

Atsushi Fukumoto; Mikio Sugiki; Mitsuru Toishi; Naoto Kojima; Hitoshi Okada; Koji Takasaki


Archive | 2010

Hologram device, tilt detection method, and tilt correction method

Akio Yamakawa; Yoshiki Okamoto; Kenji Tanaka; Kazutatsu Tokuyama; Koji Takasaki


Archive | 2010

LIGHT IRRADIATION DEVICE AND CONTROL METHOD

Akio Yamakawa; Yoshiki Okamoto; Kenji Tanaka; Kazutatsu Tokuyama; Koji Takasaki


Archive | 2001

TRACKING SERVO METHOD FOR OPTICAL PICKUP DEVICE

Tsutomu Maruyama; Hitoshi Okada; Koji Takasaki; 務 丸山; 均 岡田; 浩司 高崎

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Shigeo Kobayashi

Tokyo Institute of Technology

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