Wavelength calibration of dispersive near-infrared spectrometer using relative k-space distribution with low coherence interferometer

Ji Hyun Kim, Jae Ho Han, Jichai Jeong

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    The commonly employed calibration methods for laboratory-made spectrometers have several disadvantages, including poor calibration when the number of characteristic spectral peaks is low. Therefore, we present a wavelength calibration method using relative k-space distribution with low coherence interferometer. The proposed method utilizes an interferogram with a perfect sinusoidal pattern in k-space for calibration. Zero-crossing detection extracts the k-space distribution of a spectrometer from the interferogram in the wavelength domain, and a calibration lamp provides information about absolute wavenumbers. To assign wavenumbers, wavelength-to-k-space conversion is required for the characteristic spectrum of the calibration lamp with the extracted k-space distribution. Then, the wavelength calibration is completed by inverse conversion of the k-space into wavelength domain. The calibration performance of the proposed method was demonstrated with two experimental conditions of four and eight characteristic spectral peaks. The proposed method elicited reliable calibration results in both cases, whereas the conventional method of third-order polynomial curve fitting failed to determine wavelengths in the case of four characteristic peaks. Moreover, for optical coherence tomography imaging, the proposed method could improve axial resolution due to higher suppression of sidelobes in point spread function than the conventional method. We believe that our findings can improve not only wavelength calibration accuracy but also resolution for optical coherence tomography.

    Original languageEnglish
    Pages (from-to)186-191
    Number of pages6
    JournalOptics Communications
    Volume367
    DOIs
    Publication statusPublished - 2016 May 15

    Bibliographical note

    Funding Information:
    This research was supported in part by a Korea University Grant, the Brain Korea 21 PLUS Program through the National Research Foundation of Korea funded by the Ministry of Education , and by the Basic Science Research Program through the National Research Foundation of Korea ( 2013R1A1A2062448 ).

    Publisher Copyright:
    © 2016 Elsevier B.V. All rights reserved.

    Keywords

    • Biomedical imaging
    • Infrared spectroscopy
    • Optical coherence tomography
    • Optical imaging

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics
    • Physical and Theoretical Chemistry
    • Electrical and Electronic Engineering

    Fingerprint

    Dive into the research topics of 'Wavelength calibration of dispersive near-infrared spectrometer using relative k-space distribution with low coherence interferometer'. Together they form a unique fingerprint.

    Cite this