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November 16, 2004
NICHIA AND SONY CO-DEVELOP NEW DUAL WAVELENGTH LASER COUPLER DEVICE COMPATIBLE WITH RED AND BLUE-VIOLET LASERS
New Single Integrated Device Offers Smaller Size and Greater Reliability to Conventional Systems
TOKYO, Japan, Nov. 16, 2004 - Merging their respective engineering strengths in laser diode technologies, Nichia Corporation (hereafter Nichia) and Sony Corporation (hereafter Sony) have successfully co-developed a wholly integrated, dual wavelength laser coupler compatible with red and blue-violet lasers. Mass production of these coupling devices is scheduled to commence by the end of 2005.
660 nm and 405 nm compatible dual wavelength laser coupler (basic prototype)
Nichia and Sony have been working on the co-development of Blue-Violet laser diode for recording and playback on optical disc from June 2002. In April 2004, the cross license agreement in the concerned field has been successfully signed, leading to the mutual usage of the excellent patents owned by the two companies, targeting outstanding development of blue-violet related laser diodes.
Comments from Mr. Gen-ichi Shinomiya, Managing Director, R&D, Engineering Headquarters, Optoelectronics Products Division, Nichia Corporation:
Comments from Dr. Osamu Kumagai, Microsystems Network Company, Sony's Device Solutions Company, Sony Corporation:
The dual wavelength laser coupler (prototype) is a single integrated device with a red laser (660 nm wavelength) for DVD playback and blue-violet laser (405 nm wavelength) for blue-violet optical disc playback. In conventional DVD/blue-violet laser optical disc systems, the laser diode and optical receiver parts corresponding to each wavelength were independent of each other. By introducing the newly developed dual wavelength laser coupler, the 2 functions can be incorporated in a single built-in element, realizing a simplified system, smaller size and enhanced reliability of the device.<Fig. 1 : Comparison between main parts of conventional optical head and the dual wavelength laser coupler>
<Fig. 2 : Construction of laser coupler prototype>