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Programmable ultrashort optical pulse delay using an acousto-optic deflector.

R Piyaket, S Hunter, J E Ford

    Applied Optics
    |November 2, 2010
    PubMed
    Summary
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    We developed an optical pulse delay system using acousto-optic deflectors to precisely manage ultrashort optical pulses. This technology enables high-speed, 3D optical memory by correcting chromatic dispersion and providing rapid, arbitrary pulse delays.

    Area of Science:

    • Photonics and Optical Engineering
    • Acousto-Optics
    • Optical Memory Systems

    Background:

    • Ultrashort optical pulses possess broad spectra, leading to chromatic dispersion.
    • Accurate control of optical pulse timing is crucial for advanced optical systems.
    • Existing methods for optical pulse delay may lack speed or flexibility.

    Purpose of the Study:

    • To introduce a novel optical pulse delay (OPD) system for ultrashort optical pulses.
    • To address chromatic dispersion inherent in ultrashort pulse applications.
    • To integrate the OPD into a 3D optical memory system utilizing pulse-collision addressing.

    Main Methods:

    • Utilized an acousto-optic deflector as the core active component for pulse delay.
    • Employed calculations to predict system performance, including delay capabilities and access times.

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  • Conducted experimental validation using a Michelson interferometer to measure achieved time delays.

    • Main Results:

    • The OPD system demonstrated the capability to provide 65 arbitrary delays with a 1 µs random access time for 100-fs pulses.
    • Achieved high power efficiency up to 85%, allowing cascading for over 4000 distinct delays.
    • Experimental measurements confirmed precise time delays for 130-fs pulses.

    Conclusions:

    • The acousto-optic deflector-based OPD is a viable solution for precise ultrashort optical pulse manipulation.
    • The system offers tunable delay and access times, adaptable for high-speed operations.
    • The developed OPD is suitable for integration into 3D optical memory architectures, enhancing data storage capabilities.