Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Optimal Dispersion Condition to Distinguish OPD Directions of Spectrally-Resolved Interferometry

방향 판별 분산간섭계의 최적 분산 조건 연구

  • Yun, Young Ho (Department of Photonic Engineering, Chosun University) ;
  • Kim, Dae Hee (Department of Photonic Engineering, Chosun University) ;
  • Joo, Ki-Nam (Department of Photonic Engineering, Chosun University)
  • 윤영호 (조선대학교 광기술공학과) ;
  • 김대희 (조선대학교 광기술공학과) ;
  • 주기남 (조선대학교 광기술공학과)
  • Received : 2016.07.19
  • Accepted : 2016.12.12
  • Published : 2017.04.01
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Abstract

Spectrally resolved interferometry (SRI) is an attractive technique to measure absolute distances without any moving components. In the spectral interferogram obtained by a spectrometer, the optical path difference (OPD) can simply be extracted from the linear slope of the spectral phase. However, SRI has a fundamental measuring range limitation due to maximum and minimum measurable distances. In addition, SRI cannot distinguish the OPD direction because the spectral interferogram is in the form of a natural sinusoidal function. In this investigation, we describe a direction determining SRI and propose the optimal conditions for determining OPD direction. Spectral phase nonlinearity, caused by a dispersive material, effects OPD direction but deteriorates spectral interferogram visibility. In the experiment, various phase nonlinearities were measured by adjusting the dispersive material (BK7) thickness. We observed the interferogram visibility and the possibility of direction determination. Based on the experimental results, the optimal dispersion conditions are provided to distinguish OPD directions of SRI.

Keywords

References

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