1. Articles from Nam Su Park

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    1. Unfolding displacement measurement method for the aliasing interferometer signal of a wavelength-comb-swept laser

      Unfolding displacement measurement method for the aliasing interferometer signal of a wavelength-comb-swept laser

      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 ...

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    1. (1 articles) Pusan National University
    2. (1 articles) Samsung
    3. (1 articles) Chang-Seok Kim
    4. (1 articles) Sun Yat-Sen University
    5. (1 articles) National Institutes of Health
    6. (1 articles) University of Illinois at Urbana-Champaign
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