Dispersion multiplexing with broadband filtering for miniature spectrometers

E. C. Cull, M. E. Gehm, D. J. Brady, C. R. Hsieh, O. Momtahan, A. Adibi

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)365-374
Number of pages10
JournalApplied optics
Issue number3
StatePublished - Jan 20 2007
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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