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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 3 — Jan. 20, 2007
  • pp: 365–374

Dispersion multiplexing with broadband filtering for miniature spectrometers

E. C. Cull, M. E. Gehm, D. J. Brady, C. R. Hsieh, O. Momtahan, and A. Adibi  »View Author Affiliations

Applied Optics, Vol. 46, Issue 3, pp. 365-374 (2007)

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We replace the traditional grating used in a dispersive spectrometer with a multiplex holographic grating to increase the spectral range sensed by the instrument. The multiplexed grating allows us to measure three different, overlapping spectral bands on a color digital focal plane. The detector's broadband color filters, along with a computational inversion algorithm, let us disambiguate measurements made from the three bands. The overlapping spectral bands allow us to measure a greater spectral bandwidth than a traditional spectrometer with the same sized detector. Additionally, our spectrometer uses a static coded aperture mask in the place of a slit. The aperture mask allows increased light throughput, offsetting the photon loss at the broadband filters. We present our proof-of-concept dispersion multiplexing spectrometer design with experimental measurements to verify its operation.

© 2007 Optical Society of America

OCIS Codes
(090.1970) Holography : Diffractive optics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 27, 2006
Revised Manuscript: September 8, 2006
Manuscript Accepted: September 25, 2006
Published: January 4, 2007

E. C. Cull, M. E. Gehm, D. J. Brady, C. R. Hsieh, O. Momtahan, and A. Adibi, "Dispersion multiplexing with broadband filtering for miniature spectrometers," Appl. Opt. 46, 365-374 (2007)

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