High-accuracy length metrology with self-correction of environmental fluctuation using optical frequency combs.

2015 Fiscal Year Final Research Report

• Project/Area Number: 25286076
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: The University of Electro-Communications
• Principal Investigator: MINOSHIMA Kaoru 電気通信大学, 情報理工学(系)研究科, 教授 (20358112)
• Co-Investigator(Kenkyū-buntansha): YASUI Takeshi 徳島大学, ソシオテクノサイエンス研究部, 教授 (70314408) ; INABA Hajime 国立研究開発法人産業技術総合研究所, 物理計測標準研究部門, 研究グループ長 (70356492)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 光コム / 距離計測 / 干渉計測 / 空気屈折率 / 超短パルスレーザー / ファイバレーザー / 精密計測 / 省エネ

Outline of Final Research Achievements

Air refractive index correction is one of the major sources of uncertainty in length metrology. In this study, high-accuracy length measurement method by use of optical frequency combs was developed and significant improvement in the accuracy of air refractive index correction was achieved. High-precision interferometric measurement method of dispersion relation of air refractive index was developed by using precise frequency control of multi-color combs. Basic technologies for high-accuracy and real-time self-correction by direct use of target optical measurement results has been developed. Ultrahigh-accuracy correction was actually demonstrated by developing the self-evaluation method without relying on the accuracy of air refractive index equation. This study opens up the high-accuracy energy-saving length measurement methods under practical environmental conditions. Developed technique can improve the accuracy of well-established empirical equations for air refractive index.

Free Research Field

超高速光科学