Development of length standard calibration system based on optical frequency comb

2014 Fiscal Year Final Research Report

• Project/Area Number: 25820171
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Measurement engineering
• Research Institution: Nagaoka University of Technology
• Principal Investigator: WEI DONG 長岡技術科学大学, 工学(系)研究科(研究院), 助教 (70610418)
• Co-Investigator(Renkei-kenkyūsha): AKETAGAWA Masato 長岡技術科学大学, 大学院工学研究科機械創造工学専攻, 教授 (10231854)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 光コム / 長さ計測 / 長さ標準 / 長さ校正 / パルス繰返間隔長 / 2色法 / 全地球測位システム / 物差

Outline of Final Research Achievements

In 2009, the national standard of length in Japan was changed from the iodine-stabilized He-Ne laser to the femtosecond optical frequency comb (FOFC). Because the He-Ne laser is monochromatic light, its wavelength was used as a practical standard to realize the meter. On the other hand, FOFC is coherent polychromatic light. In addition to wavelength, FOFC contains another length unit, the adjacent pulse repetition interval length (APRIL), which is a coherent combination of multiple wavelengths.Instead of using wavelength, we have employed the APRIL as a standard and proposed an APRIL-based homodyne interferometer.As an alternative to the conventional two-color (that is, wavelength-based) length-measurement technique, we propose a two-color method based on the adjacent pulse repetition interval length (APRIL), the physical length associated with the pulse repetition period.

Free Research Field

精密計測