Akihiko Oka

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Kokubunji, JP

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Patents Grantslast 30 patents

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Semiconductor laser device with plural active layers and changing o...
- Patent number 5,177,758
- Issue date Jan 5, 1993
- Hitachi, Ltd.
- Akihiko Oka
- B82 - NANO-TECHNOLOGY
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Wavelength tunable laser diode
- Patent number 5,173,909
- Issue date Dec 22, 1992
- Hitachi, Ltd.
- Shinji Sakano
- B82 - NANO-TECHNOLOGY
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Semiconductor laser device capable of controlling wavelength shift
- Patent number 5,119,393
- Issue date Jun 2, 1992
- Hitachi, Ltd.
- Akihiko Oka
- B82 - NANO-TECHNOLOGY