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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 11, Iss. 11 — Jun. 2, 2003
  • pp: 1258–1264

Heterodyne Fourier transform spectrometer for the near- infrared region

Akiko Hirai, Hirokazu Matsumoto, Dejiao Lin, and Chie Tagaki  »View Author Affiliations

Optics Express, Vol. 11, Issue 11, pp. 1258-1264 (2003)

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A Fourier transform spectrometer with heterodyne modulation achieved by a moving diffraction grating has been developed for the near-infrared (NIR) region. The grating simultaneously acts as a beam splitter and a modulator, which realizes the optical frequency shift of incident light for increasing the sensitivity of measurements by the heterodyne detection technique. The differences in diffraction angle among broad spectra are compensated by a collimating mirror and plane mirrors. The proposed spectrometer is used for the measurements of spectra in the NIR region. The signal-to-noise ratio of measurements is improved sevenfold with a heterodyne modulation of 410 Hz. As examples, this spectrometer is applied for quantitative calibration and discrimination of organic solutions. The measurement of transmission spectra of a grape is also demonstrated.

© 2003 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(050.1950) Diffraction and gratings : Diffraction gratings
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms

ToC Category:
Research Papers

Original Manuscript: April 8, 2003
Revised Manuscript: May 15, 2003
Published: June 2, 2003

Akiko Hirai, Hirokazu Matsumoto, Dejiao Lin, and Chie Tagaki, "Heterodyne Fourier transform spectrometer for the near- infrared region," Opt. Express 11, 1258-1264 (2003)

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