Length and refractive index measurement by Fourier transform interferometry and frequency comb spectroscopy
Abstract
In this paper we describe the progress we have made in our simultaneous length measurement and the femtosecond comb interferometric spectroscopy in a conventional arrangement with a moving mirror. Scanning and detection over an interval longer than the distance between two consecutive pulses of the frequency comb allow for a spectral resolution of the individual frequency modes of the comb. Precise knowledge of comb mode frequency leads to a precise estimation of the spectral characteristics of inspected phenomena. Using the pulse train of the frequency comb allows for measurement with highly unbalanced lengths of interferometer arms, i.e. an absolute long distance measurement. Further, we present a non-contact (double sided) method of measurement of the length/thickness of plane-parallel objects (gauge blocks, glass samples) by combining the fs comb (white light) with single frequency laser interferometry. The position of a fringe packet is evaluated by estimating the stationary phase position for any wavelength in the spectral band used. The repeatability of this position estimation is a few nanometres regardless of whether dispersion of the arms is compensated (transform limited fringe packet ?10 fringes FWHM) or highly different (fringe packet stretched to >200 fringes FWHM). The measurement of steel gauge block by this method was compared with the standard method, and deviation (+13 ? 12) nm for gauge blocks (2 to 100) mm was found. The measurement of low reflecting ceramic gauges or clear glass samples was also tested. In the case of glass, it becomes possible to measure simultaneously both the thickness and the refractive index (and dispersion) of flat samples.
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- Authors
- Balling, P., Mašika, P., Křen, P., & Doležal, M.
- Venue
- Measurement Science and Technology
- Publisher
- IOP Publishing
- Published
- 2012-07-25
- Volume
- 23
- Issue
- 9
- Pages
- 094001
- ISSN
- 0957-0233 (ISSN-L)
- 1361-6501
- OpenAlex
- W2048609351
- Cited by
- 66
- References
- 41
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 1 · 2023: 4 · 2021: 9 · 2020: 2 · 2019: 3 · 2018: 5 · 2017: 4 · 2016: 9 · 2015: 13 · 2014: 4 · 2013: 6 · 2012: 1
- FWCI
- 11.74
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Measurement Science and Technology (publishedVersion)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Measurement and Metrology Techniques
- Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Optical measurement and interference techniques
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Fiber Laser Technologies
- Keywords
- length measurement, refractive index measurement, femtosecond optical frequency comb, Fourier transform interferometry, gauge blocks, glass thickness measurement, dispersion measurement, non-contact measurement
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