REALIZATION OF LENGTH TRACEABILITY BY A FEMTOSECOND OPTICAL FREQUENCY COMB

Dong Wei, Masato Aketagawa

Abstract

The national standard of length in Japan changed from the iodine-stabilized He–Ne laser to a femtosecond optical frequency comb (FOFC) in 2009. This means that there are different frequencies and their combination, adjacent pulse repetition interval length (APRIL), which can be used as a scale since an FOFC is a phase-coherent combination of several hundreds of thousands of wavelengths. Thus, the following questions arise naturally: Which parameters can be used as a scale? What are their characteristics? The goal of this paper is to answer these questions. We show the similarity and the difference between wavelength and APRIL for length measurement, and we discuss new concepts of APRIL-based length measurement. The status of the experiment is reported.

Keywords

length ruler, ambiguity, laser optics, length measurement, metrology

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DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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