| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1986: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1985: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
This research project aimed at the implementation of a compact and stable laser-gyro rotation sensor based on the integration of Sagnac interferometer using an optical waveguide. The results are summarized as follows:
1. For the waveguide-type passive components required for construction of an integrated-optic laser-gyro rotation sensor, waveguide Fresnel lenses for guided-wave collimating and focusing, butt-coupled reflection-type Bragg gratings for use as a lens or a beam splitter, focusing grating couplers for fiber coupling, etc. were studied. The design procedures were established through theoretical analyses. The components were fabricated by electron-beam direct writing and dry etching techniques, and the characteristics were evaluated.
2. The design technique of waveguide acoustooptic Bragg cells for use as a beam spltter, a phase modulator or a frequency shifter was established. The performances required for use in an integrated-optic lasergyro rotation sensor were accomplished in the fabrication devices.
3. Integrated-optics device constructions of a passive Sagnac interferometer, a Sagnac interferometer for frequency modulation detection technique, and a Sagnac interferometer for heterodine detection technique were proposed using grating components. The ultimate performances of each device were theoretically evaluated, and the requirements for the components were clarified.
4. A prototype of integrated-optic Sagnac interferometer for frequency modulation detection technique was fabricated and tested. In the experiments, the fundamental interferometer operation and the frequency modulation detection function were demonstrated.
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