2010 Fiscal Year Final Research Report
Absolute length measurement with sub-nanometer accuracy using frequency standard
| Project/Area Number |
20360066
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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 |
Production engineering/Processing studies
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
AKETAGAWA Masato Nagaoka University of Technology, 工学部, 教授 (10231854)
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| Co-Investigator(Kenkyū-buntansha) |
HIRATA Kenji 長岡技術科学大学, 工学部, 准教授 (40314364)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 精密位置決め / 加工計測 / 長さ計測 |
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| Research Abstract |
Since the free spectral range (FSR) of a Fabry-Perot cavity (FP cavity) is defined by a half of light velocity in vacuum (c/2) divided by product of the geometrical distance between the two mirrors (L) and the refractive index in the FP Cavity (n), the FSR measurement is a potential method to measure the absolute length L. In this study, we have developed a method to measure the FSR of a FP cavity using frequency modulation with an electric optical modulator (EOM) and the null method. We have determined the FSR with the measurement uncertainty of order 10^<-8>. From this result, it is possible to measure absolute length of 1m order with uncertainty of nm or less. Using the same method, we have demonstrated the active suppression of air refractive index fluctuation.
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