2000 Fiscal Year Final Research Report Summary
Closed Loop Phase Shifting Interferometer Using FM feature of Laser Diodes
| Project/Area Number |
11450024
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | GUNMA UNIVERSITY |
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Principal Investigator |
TOSHINIKO Yoshino Gunma University, Faculty of Engineering, Professor, 工学部, 教授 (90013169)
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| Co-Investigator(Kenkyū-buntansha) |
YOKOTA Masayuki Gunma University, Faculty of Engineering, Research Associate, 工学部, 助手 (80323335)
TAKAHASHI Yoshitaka Gunma University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30216767)
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| Project Period (FY) |
1999 – 2000
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| Keywords | Optical Sensing / Closed Loop / Heterodyne / FM feature of laser diodes / Fringe analysis |
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| Research Abstract |
A closed loop phase shifting Fizeau-type interferometer is constructed by using the direct frequency modulation (FM) of a laser diode. The interferometer is servo controlled fully in the phase domain where optical phases are detected by a two-frequency optical heterodyne method. Detailed study on stabilization of the interferometer under feedback control is conducted both experimentally and theoretically. The interferometer showed a good stabilization against the applied vibration upto 200 Hz. The stabilization factors obtained experimentally are in good agreement with the theoretical calculations. The phase shifting experiment has been accomplished with a high precision as well as a high stabilization against external disturbances. The profile measurement of a mirror surface was conducted by the phase shifting analysis algorithm and a good measurement reproducibility of λ/60 in the root mean square value was obtained for 10 times measurements in a period of 20 min.
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