| Project/Area Number |
06555098
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子デバイス・機器工学
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| Research Institution | Tohoku University |
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Principal Investigator |
NAKAMURA Kiyoshi Tohoku University, Faculty of Engineering, Professor, 工学部, 教授 (00005365)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Tetsuo Tokin Corp., Senior Manager, 商品開発研究所, 部長
YAMADA Ken Tohoku University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80134021)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥8,100,000 (Direct Cost: ¥8,100,000)
Fiscal Year 1995: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1994: ¥4,300,000 (Direct Cost: ¥4,300,000)
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| Keywords | light deflector / lithium niobate / inverted domain / piezoelectric actuator / ferroelectrics / piezoelectrics / tunable optical filter / torsional vibrator |
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| Research Abstract |
The purpose of this research project is to propose light deflectors consisting of a single crystal plate with no bonding layr by utilizing inverted domains of LiNbO_3 and to develop comact high precision light deflectors with a quick response and a wide scanning range. The results obtained in this project are summarized as follows : 1. The optimal cut suitable for generating only torsional motion efficiently without causing bending motion in a plate with an inverted domain layr was found to be the 148ﾟ rotated Y-cut plate with the longer side tilted 52ﾟ from the Z' axis. 2. The temperature dependences of the transverse piezoelectric strain constant and coupling factor of LiNbO_3 were measured in the range from-100ﾟto+150ﾟC and were shown to be considerably small compared to those of piezoelectric ceramics 3. The static deformation and resonant vibration of the torsional actuator were theoretically analyzed and the design guideline for attaining wide scannning range and quick response w
… More
as established. 4. The heat treatment conditions for forming an inverted domain layr, methods for supporting light deflectors, countermeasures for electrical breakdown, and vibration damping methods were examined and the fabrication process of light deflectors was established. 5. It was experimentally shown that a light deflector fabricated using a 140ﾟ rotated Y-cut LiNbO_3 plate had an excellent linearity and no hysteresis. A light scanning range as large as 25ﾟ was attained by application of a voltage of (]SY.+-.])1.5 kV to a light deflector with dimensions of 17*5*0.1 mm^3.6. When a small-size deflector with dimensions of 7.5*3*0.1 mm^3 was driven at the resonant frequency, a larger scanning range of 20ﾟ was attained with a low ac voltage of 16 V_<p-p>.7. A tunable optical filter consisting of the light deflector and a Fabry-Perot etalon was proposed for wavelength division multiplexed optical communication systems and was demonstrated to have narrowband (0.15nm) tunable characteristics. Less
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