Accurate wavelength calibration method for spectrometer using low coherence interferometry

Ji Hyun Kim, Jae Ho Han, Jichai Jeong

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Dispersive spectrometers are subject to wavelength dispersion errors due to aberration, ruling errors, etc. Thus, their calibration forms an integral aspect of their usage. In this context, we present an interferometric wavelength calibration method for calibrating dispersive spectrometers. The calibration system is based on low coherence interferometry. By analyzing the sinusoidal interference patterns that are modulated in a spectrum, we determine the distribution of wavelengths in a spectrometer using the zero-crossing detection. The spectral sampling interval of the spectrometer is estimated by determining the sampling interval in the z-domain. Assigning only one wavelength to the corresponding camera pixel using a narrowband light source allows the determination of entire wavelengths accurately. We use the information of the wavelength distribution, spectral sampling interval, and wavelength data to achieve accurate calibration. Our experimental results show that the proposed method calibrates wavelength more accurately than conventional methods, since the interferometric calibration can reduce the wavelength fitting error arising from extrapolation. Moreover, the proposed calibration method can reduce the side-lobe amplitude maximally by 4.8 dB when applied to OCT imaging. We believe that our findings can significantly aid in the development of spectrometry.

Original languageEnglish
Article number7014224
Pages (from-to)3413-3418
Number of pages6
JournalJournal of Lightwave Technology
Volume33
Issue number16
DOIs
Publication statusPublished - 2015 Aug 15

Keywords

  • Calibration
  • Optical imaging
  • Spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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