Comb-referenced laser distance interferometer for industrial nanotechnology

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A prototype laser distance interferometer is demonstrated by incorporating the frequency comb of a femtosecond laser for mass-production of optoelectronic devices such as flat panel displays and solar cell devices. This comb-referenced interferometer uses four different wavelengths simultaneously to enable absolute distance measurement with the capability of comprehensive evaluation of the measurement stability and uncertainty. The measurement result reveals that the stability reaches 3.4 nm for a 3.8 m distance at 1.0 s averaging, which further reduces to 0.57 nm at 100 s averaging with a fractional stability of 1.5 x 10(-10). The uncertainty is estimated to be in a 10(-8) level when distance is measured in air due to the inevitable ambiguity in estimating the refractive index, but it can be enhanced to a 10(-10) level in vacuum
Publisher
NATURE PUBLISHING GROUP
Issue Date
2016-08
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.6

ISSN
2045-2322
DOI
10.1038/srep31770
URI
http://hdl.handle.net/10203/213169
Appears in Collection
ME-Journal Papers(저널논문)
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