July 2020
Spotlight Summary by Fabian Duerr
Cascade optical coherence tomography (C-OCT)
"If you can't measure it, you can't improve it." - ultimately, both designers and fabricators of freeform optical systems appreciate this well-known quote. Most experts in the field therefore consider advances in metrology crucial in moving freeform optics deployment forward. Indeed, measuring large freeform surface shapes with considerable departure from a sphere to nanometer accuracy remains an enormous challenge.
For this article, the authors developed and investigated a point-cloud cascade optical coherence tomography (C-OCT) technique to address this metrology challenge. They developed and built a rotating cube interferometer design for the C-OCT secondary interferometer in order to enable high-speed measurements. With a prototype setup, the authors have demonstrated an impressive single-point precision of ±26 nm, clearly leading the way towards full freeform optical surface measurements.
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For this article, the authors developed and investigated a point-cloud cascade optical coherence tomography (C-OCT) technique to address this metrology challenge. They developed and built a rotating cube interferometer design for the C-OCT secondary interferometer in order to enable high-speed measurements. With a prototype setup, the authors have demonstrated an impressive single-point precision of ±26 nm, clearly leading the way towards full freeform optical surface measurements.
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Article Information
Cascade optical coherence tomography (C-OCT)
Di Xu, Andres Garcia Coleto, Benjamin Moon, Jonathan C. Papa, Michael Pomerantz, and Jannick P. Rolland
Opt. Express 28(14) 19937-19953 (2020) View: Abstract | HTML | PDF