Abstract

As a step toward a field-use spectrometer based on Fourier-transform spectroscopy, we have developed a prism-scanning interferometer. It consists of a sliding triangular prism with two mirror surfaces attached to a fixed triangular-prism beam splitter. This design eliminates the effect of ambient air and simplifies alignment, which can otherwise be time consuming. It also halves the stage-moving distance, because the optical path difference is doubled, since both mirrors move while the sliding prism is scanning. We have tested the basic operation of the prototype and found that the spectral resolution and the wavelength scale agree well with our simple calculation.

© 2000 Optical Society of America

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References

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  1. P. R. Griffith and J. A. de Haseth, Fourier Transform Infrared Spectrometry (Wiley, New York, 1986), Chap. 1.
  2. Ohara Glass Catalog (Ohara Inc., Sagamihara 229-1186 Japan, 1995).
  3. http://www.ohara-inc.co.jp/ .
  4. S. D. Collins, R. L. Smith, C. Gonzalez, K. P. Stewart, J. G. Hagopian, and J. M. Sirota, Opt. Lett. 24, 844 (1999).
    [CrossRef]

1999

Opt. Lett.

Other

P. R. Griffith and J. A. de Haseth, Fourier Transform Infrared Spectrometry (Wiley, New York, 1986), Chap. 1.

Ohara Glass Catalog (Ohara Inc., Sagamihara 229-1186 Japan, 1995).

http://www.ohara-inc.co.jp/ .

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Figures (5)

Fig. 1
Fig. 1

Schematic configuration of the prism interferometer. As the sliding prism moves, the relative distances to the two retroreflection mirror are +2nx sin θ and -2nx sin θ, and the OPD varies as 4nx sin θ, depending on the prism-translation distance x.

Fig. 2
Fig. 2

Wave-number dependence of the refractive index of Ohara S-BSL7 glass (open squares) and the wave-number scale-correction curve (filled diamonds).

Fig. 3
Fig. 3

Spectrum of a He–Ne laser measured during a ±75µm sliding prism scan.

Fig. 4
Fig. 4

Spectrum of an InGaAsP semiconductor laser measured during a ±150µm sliding prism scan.

Fig. 5
Fig. 5

Spectrum and (inset) the interferogram of a tungsten-halogen lamp measured during a ±150µm sliding prism scan.

Equations (2)

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Δσ=0.88/OPD,
OPD=4nx sin θ,

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