Related Experiment Video
Updated: Feb 13, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Unfolding displacement measurement method for the aliasing interferometer signal of a wavelength-comb-swept laser
Abstract:
We demonstrate an unfolding displacement measurement method to overcome the aliasing problem of wavelength-comb-swept laser (WCSL). Compared to the conventional wavelength-swept laser (WSL), the WCSL exhibits an extended coherence length, owing to the narrowing spectral linewidth of the etalon filter. However, the aliasing interference signal induces an unexpected back-bounced phenomenon during displacement measurement because of the discretely distributed comb-like periodic spectra of the etalon filter. By using the dual-reference interferometry method, the back-bounced displacement measurement can be successfully unfolded to extend the measurement range by two times. In addition, we demonstrate a longer-range surface profiling image over 18 mm within the 200 mm of measurement range using a line-field beam of a parallel-swept source-optical coherence tomography system.
Related Concept Videos
Aliasing
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
The de Broglie Wavelength
The Unfolded Protein Response
Displacement Current
Position and Displacement
Position and Displacement Vectors
Further, several important kinds of...

