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Mode-resolved frequency comb interferometry for high-accuracy long distance measurement.

van den Berg SA, van Eldik S, Bhattacharya N - Sci Rep (2015)

Bottom Line: By applying a high-resolution spectrometer based on a virtually imaged phased array, the frequency comb modes are resolved spectrally to the level of an individual mode.From the spectrally resolved output of a Michelson interferometer a distance is derived.Comparison with a fringe counting laser interferometer shows an agreement within <10(-8) for a distance of 50 m.

View Article: PubMed Central - PubMed

Affiliation: VSL, Thijsseweg 11, 2629 JA Delft, The Netherlands.

ABSTRACT
Optical frequency combs have developed into powerful tools for distance metrology. In this paper we demonstrate absolute long distance measurement using a single femtosecond frequency comb laser as a multi-wavelength source. By applying a high-resolution spectrometer based on a virtually imaged phased array, the frequency comb modes are resolved spectrally to the level of an individual mode. Having the frequency comb stabilized against an atomic clock, thousands of accurately known wavelengths are available for interferometry. From the spectrally resolved output of a Michelson interferometer a distance is derived. The presented measurement method combines spectral interferometry, white light interferometry and multi-wavelength interferometry in a single scheme. Comparison with a fringe counting laser interferometer shows an agreement within <10(-8) for a distance of 50 m.

No MeSH data available.


Observed differences between the frequency comb distance measurement, based on spectral interferometry and the counting laser interferometer.The error bars indicate twice the standard deviation over the 5 measurements.
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f5: Observed differences between the frequency comb distance measurement, based on spectral interferometry and the counting laser interferometer.The error bars indicate twice the standard deviation over the 5 measurements.

Mentions: In Fig. 4 typical VIPA CCD-camera pictures are shown, for an interferometer length of 0 m, 5 mm, 20 m and 50 m, respectively. The stitched data are shown on the right-hand side. The data have been normalized to the envelope of the comb spectrum using the spectral data as obtained from both the measurement and the reference arm individually. Based on the curve fit and the determination of the integer number of pulses and the sign, a distance is derived based on the spectral interferometry method for each position following Eqs (10) and (6). Figure 5 shows the measured differences between the counting laser interferometer and the comb-measurement. The agreement between both methods is within 1 μm over the full length of the measurement bench for each individual measurement and <500 nm when averaged over 5 measurements. At a distance of 50 m this is a relative agreement within 10−8.


Mode-resolved frequency comb interferometry for high-accuracy long distance measurement.

van den Berg SA, van Eldik S, Bhattacharya N - Sci Rep (2015)

Observed differences between the frequency comb distance measurement, based on spectral interferometry and the counting laser interferometer.The error bars indicate twice the standard deviation over the 5 measurements.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588503&req=5

f5: Observed differences between the frequency comb distance measurement, based on spectral interferometry and the counting laser interferometer.The error bars indicate twice the standard deviation over the 5 measurements.
Mentions: In Fig. 4 typical VIPA CCD-camera pictures are shown, for an interferometer length of 0 m, 5 mm, 20 m and 50 m, respectively. The stitched data are shown on the right-hand side. The data have been normalized to the envelope of the comb spectrum using the spectral data as obtained from both the measurement and the reference arm individually. Based on the curve fit and the determination of the integer number of pulses and the sign, a distance is derived based on the spectral interferometry method for each position following Eqs (10) and (6). Figure 5 shows the measured differences between the counting laser interferometer and the comb-measurement. The agreement between both methods is within 1 μm over the full length of the measurement bench for each individual measurement and <500 nm when averaged over 5 measurements. At a distance of 50 m this is a relative agreement within 10−8.

Bottom Line: By applying a high-resolution spectrometer based on a virtually imaged phased array, the frequency comb modes are resolved spectrally to the level of an individual mode.From the spectrally resolved output of a Michelson interferometer a distance is derived.Comparison with a fringe counting laser interferometer shows an agreement within <10(-8) for a distance of 50 m.

View Article: PubMed Central - PubMed

Affiliation: VSL, Thijsseweg 11, 2629 JA Delft, The Netherlands.

ABSTRACT
Optical frequency combs have developed into powerful tools for distance metrology. In this paper we demonstrate absolute long distance measurement using a single femtosecond frequency comb laser as a multi-wavelength source. By applying a high-resolution spectrometer based on a virtually imaged phased array, the frequency comb modes are resolved spectrally to the level of an individual mode. Having the frequency comb stabilized against an atomic clock, thousands of accurately known wavelengths are available for interferometry. From the spectrally resolved output of a Michelson interferometer a distance is derived. The presented measurement method combines spectral interferometry, white light interferometry and multi-wavelength interferometry in a single scheme. Comparison with a fringe counting laser interferometer shows an agreement within <10(-8) for a distance of 50 m.

No MeSH data available.