Now showing items 1-16 of 16

    • Analysis and Optimization for Volume Holographic Recrording 

      Momtahan, Omid (Georgia Institute of Technology, 2006-07-07)
      Methods for analysis and optimization of volume holographic recording are presented for two main groups of applications. In the first group of applications (mainly storage systems), the designs and the techniques of volume ...
    • 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 ...
    • Compact Fourier-transform volume holographic spectrometer for diffuse source spectroscopy 

      Hsieh, Chaoray; Momtahan, Omid; Karbaschi, Arash; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2005-04)
      We present a new idea for diffuse source spectroscopy using a Fourier-transform volume holographic spectrometer formed by a Fourier-transform lens, a volume hologram, and a CCD. We show that this spectrometer can operate ...
    • 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, ...
    • Dynamic optical correlation using localized holography 

      Karbaschi, Arash; Momtahan, Omid; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2007-03)
      A new technique for optical correlation using gated holographic recording is demonstrated. Several persistent holograms are localized within separate slices as close as 33 μm apart along the crystal. Individual holograms ...
    • Global optimization of sensitivity and dynamic range for two-center holographic recording 

      Momtahan, Omid; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2003-03)
      The performance of two-center holographic recording is theoretically studied and described in detail. We present a systematic method for global optimization of two-center holographic recording. Whereas the method presented ...
    • Multifunctional and compact spectrometers based on cylindrical beam volume holograms 

      Momtahan, Omid; Hsieh, Chaoray; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2007-11)
      We propose a new class of slitless spectrometers using cylindrical beam volume holograms. These holograms disperse an input beam in one direction in an output plane while they do not affect the beam in the perpendicular ...
    • 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 ...
    • Optical correlation using gated localized holography 

      Karbaschi, Arash; Momtahan, Omid; Adibi, Ali; Javidi, Bahram (Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2005-08)
      We present a new technique for optical correlation using gated holographic recording by which the holograms are localized in separate slices along the recording medium. We compare the performance of localized holographic ...
    • 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. ...
    • Sensitivity variation in two-center holographic recording 

      Momtahan, Omid; Cadena, George H.; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2005-10)
      An experimental study of variation of sensitivity with recording and sensitizing intensities in two-center recording is presented. The experimental results are in good agreement with the theoretical predictions. It is shown ...
    • Simple and efficient software-based stabilized holographic recording system 

      Cadena, George H.; Momtahan, Omid; Adibi, Ali (Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2006-12)
      A simple, inexpensive, and efficient stabilized holographic recording setup is described which precludes the destructive fringe movement encountered in long-lasting holographic exposures. Utilizing a straightforward ...
    • 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 ...
    • Volumetric storage limits and space-volume multiplexing trade-offs for holographic channels 

      Srinivasa, Shayan G.; Momtahan, Omid; Karbaschi, Arash; McLaughlin, Steven W.; Fekri, Faramarz; Adibi, Ali (Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2010-01)
      We consider M-ary signaling in page-oriented holographic storage systems that multiplex pages using three methods: conventional angular multiplexing throughout the volume, localized recording, and a combination of angular ...