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Electrically controllable multiple, active, computer-generated hologram.

C Slinger, P Brett, V Hui

    Optics Letters
    |July 15, 1997
    PubMed
    Summary
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    A novel multiple, active, computer-generated hologram (MACH) device uses liquid crystals to generate various optical wave fronts with a single voltage. This technology offers an alternative to traditional spatial light modulators.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Holography

    Background:

    • Electrically controllable diffraction gratings and computer-generated holograms are key optical technologies.
    • Spatial light modulators (SLMs) are crucial for manipulating light wavefronts.

    Purpose of the Study:

    • To introduce and describe the principles of a novel Multiple, Active, Computer-generated Hologram (MACH) device.
    • To present experimental results demonstrating the MACH device's capabilities.
    • To compare the MACH device with existing electrically addressed spatial light modulators.

    Main Methods:

    • The MACH device integrates a surface relief transmitting structure with a nematic liquid crystal layer.
    • This structure is sandwiched between two planar indium tin oxide electrodes.

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  • A single applied voltage controls the device's optical output.

    • Main Results:

    • The MACH device successfully generated multiple, desired, uncorrelated optical wave fronts.
    • Experimental results validated the device's operational principles.
    • The device demonstrated selective wave front generation under voltage control.

    Conclusions:

    • The MACH device represents a novel approach to optical wave front generation.
    • It offers a promising alternative to conventional spatial light modulators.
    • Further investigation into its relative merits is warranted.