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.
© 2007 Optical Society of America
Full Article | PDF ArticleMore Like This
Ashwin A. Wagadarikar, Michael E. Gehm, and David J. Brady
Appl. Opt. 46(22) 4932-4942 (2007)
C. Fernandez, B. D. Guenther, M. E. Gehm, D. J. Brady, and M. E. Sullivan
Opt. Express 15(9) 5742-5753 (2007)
M. Harwit, P. G. Phillips, T. Fine, and N. J. A. Sloane
Appl. Opt. 9(5) 1149-1154 (1970)