• Analysis of slitless holographic spectrometers implemented by spherical beam volume holograms 

      Momtahan, Omid; Hsieh, Chaoray; Adibi, Ali; Brady, David J. (Georgia Institute of TechnologyOptical Society of America, 2006-05)
      The analysis of a slitless volume holographic spectrometer is presented in detail. The spectrometer is based on a spherical beam volume hologram followed by a Fourier-transforming lens and a CCD. It is shown that the ...
    • Dispersion multiplexing with broadband filtering for miniature spectrometers 

      Cull, E. C.; Gehm, M. E.; Brady, David J.; Hsieh, Chaoray; Momtahan, Omid; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2007-01)
      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, ...
    • Multimodal multiplex spectroscopy using photonic crystals 

      Xu, Zhaochun; Wang, Zhanglei; Sullivan, Michael E.; Brady, David J.; Foulger, Stephen H.; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2003-09)
      Spatio-spectral transmission patterns induced on low coherence fields by disordered photonic crystals can be used to construct optical spectrometers. Experimental results suggest that 1–10 nm resolution multimodal spectrometers ...
    • Multiple order coded aperture spectrometer 

      Feller, S. D.; Chen, Haojun; Brady, David J.; Gehm, M. E.; Hsieh, Chaoray; Momtahan, Omid; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2007-04)
      We introduce a multiple order coded aperture (MOCA) spectrometer. The MOCA is a system that uses a multiplex hologram and a coded aperture to increase the spectral range and throughput of the system over conventional ...
    • Qualitative demonstration of spectral diversity filtering using spherical beam volume holograms 

      Karbaschi, Arash; Hsieh, Chaoray; Momtahan, Omid; Adibi, Ali; Sullivan, Michael E.; Brady, David J. (Georgia Institute of TechnologyOptical Society of America, 2004-06)
      We investigate the feasibility of designing spectral diversity filters using spherical beam volume holograms. Our experimental results qualitatively show the separation of the information of different incident wavelength ...
    • Role of recording geometry in the performance of spectral diversity filters with spherical beam volume holograms 

      Hsieh, Chaoray; Momtahan, Omid; Karbaschi, Arash; Adibi, Ali; Sullivan, Michael E.; Brady, David J. (Georgia Institute of TechnologyOptical Society of America, 2005-01)
      We present experimental demonstrations of spectral diversity filters with spherical beam volume holograms for multimodal multiplex spectroscopy. Major properties of filters under diffuse-light illumination are discussed. ...
    • Spherical beam volume holograms for spectroscopic applications: modeling and implementation 

      Momtahan, Omid; Hsieh, Chaoray; Karbaschi, Arash; Adibi, Ali; Sullivan, Michael E.; Brady, David J. (Georgia Institute of TechnologyOptical Society of America, 2004-12)
      The spherical beam volume hologram, recorded by a plane wave and a spherical beam, is investigated for spectroscopic applications in detail. It is shown that both the diffracted and the transmitted beam can be used for ...
    • Very-high-resolution tandem Fabry-Perot etalon cylindrical beam volume hologram spectrometer for diffuse source spectroscopy 

      Badieirostami, Majid; Momtahan, Omid; Hsieh, Chaoray; Adibi, Ali; Brady, David J. (Georgia Institute of TechnologyOptical Society of America, 2008-01)
      We demonstrate a compact and slitless spectrometer with high resolution formed by cascading a Fabry-Perot etalon (FPE) and a cylindrical beam volume hologram (CBVH). The most significant advantage of this combined spectrometer ...