1986 Fiscal Year Final Research Report Summary
FABRICATION OF FLEXIBLE WAVEGUIDES FOR HIGH-POWERED INFRARED WAVES
| Project/Area Number |
60850067
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
電子機器工学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
NISHIDA SHIGEO RESEARCH INSTITUTE OF ELECTRICAL COMMUNICATION, TOHOKU UNIVERSITY, 電気通信研究所, 教授 (70006211)
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| Co-Investigator(Kenkyū-buntansha) |
HONGO AKIHITO CABLE RESEARCH LABORATORY, HITACHI CABLE LTD., 電線研究所, 研究員
SHIOTA TSUNEO CABLE RESEARCH LABORATORY, HITACHI CABLE LTD., 電線研究所, 主任研究員
MIYAGI MITSUNOBU RESEARCH INSTITUTE OF ELECTRICAL COMMUNICATION, TOHOKU UNIVERSITY, 電気通信研究所, 助教授 (90006263)
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| Project Period (FY) |
1985 – 1986
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| Keywords | Infrared Transmission / Power Transmission / Dielectric-Coated Waveguide / Hollow Waveguide / <CO_2> Laser / Germanium / 電力容量 |
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| Research Abstract |
1. FABRICATION BASED ON RF-SPUTTERING
TO FABRICATE DIELECTRIC-COATED METALLIC WAVEGUIDES BASED ON RF-SPUTTERING, ELECTROPLATING, AND ETCHING TECHNIQUES, THE ELECTROPLATING PROCESS IS THE MOST ESSENTIAL TO REDUCE WAVEGUIDE LOSSES. WE HAVE FOUND THAT A PLATING BATH CAUSING HIGH STRESS DURING ELECTROPLATING IS SUITABLE TO FABRICATE WAVEGUIDES WITH LOW LOSSES.
2. FABRICATION OF ELECTRICALLY DEPOSITED GERMANIUM-COATED METALLIC HOLLOW WAVEGUIDES
TO FABRICATE GERMANIUM-COATED WAVEGUIDES WITH RELATIVELY LARGE DIAMETER, A TECHNIQUE OF ELECTRODEPOSITION OF GERMANIUM INSIDE METALLIC PIPE HAS BEEN ESTABLISHED. WAVEGUIDES WITH SMALL TRANSMISSION LOSSES HAVE BEEN FABRICATED WITH A DIAMETER OF 4 mm AND LENGTH OF 1 m. TEMPERATURE INCREASE ALONG THE GERMANIUM-COATED WAVEGUIDES HAS BEEN FOUND VERY SMALL COMPARED WITH THOSE OF METALLIC AND GLASS HOLLOW WAVEGUIDES.
3. POWER HANDLING CAPABILITY OF HOLLOW WAVEGUIDES
THEORETICAL ANALYSES HAVE BEEN CARRIED OUT TO EVALUATE THE POWER HANDLING CAPABILITY OF HOLLOW WAVEGUIDES FOR <CO_2> LASER LIGHT. DIEELECTRIC-COATED METALLIC WAVEGUIDES ARE SHOWN TO TRANSMIT MUCH HIGHER POWERS THAN CONVENTIONAL METALLIC WAVEGUIDES. NEW FORMALISM DESCRIBING TEMPERATURE INCREASE ALONG WAVEGUIDES IS ALSO ESTABLISHED.
4. ELECTROMAGNETIC FIELD THEORY
A NEW METHOD IS DEVELOPED TO EVALUATE PROPAGATION CONSTANTS OF GUIDED OR LEAKY MODES IN CYLINDRICAL DIELECTRIC WAVEGUIDES WITH ARBITRARY CROSS SECTION. SEVERAL SIGNIFICANT RESULTS HAVE BEEN DERIVED BY USING THE NEW METHOD FOR SOLID AS WELL AS HOLLOW GUIDED STRUCTURES.
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