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Dispersion multiplexing with broadband filtering for miniature spectrometers

Authors :
Cull, E.C.
Gehm, M.E.
Brady, D.J.
Hsieh, C.R.
Momtahan, O.
Adibi, A.
Source :
Applied Optics. Jan 20, 2007, Vol. 46 Issue 3, p365, 10 p.
Publication Year :
2007

Abstract

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. OCIS codes: 120.620, 090.1970.

Details

Language :
English
ISSN :
1559128X
Volume :
46
Issue :
3
Database :
Gale General OneFile
Journal :
Applied Optics
Publication Type :
Academic Journal
Accession number :
edsgcl.158623297