Real-time adaptive optics with a twisted nematic liquid crystal light modulator controlled by the wave front reconstruction sensor

Masayuki Hattori, Shinichi Komatsu

    Research output: Contribution to journalArticle

    6 Citations (Scopus)


    We propose adaptive optics constructed with a new principle. In this system, numerical phase reconstruction algorithm is incorporated with the Hartmann wave front sensor and the phase compensator is driven to the conjugate of the input phase distortion at each time step. The computer simulation shows a sufficient robustness and swiftness of the wave front reconstruction sensor. Then, the experimental system is configured putting special emphasis on the simplicity and feasibility of the system. A small 2-dimensional grid mask is used in the Hartmann sensor, and a twisted nematic phase modulator with a response time of 30 ms is used as the phase compensator. The control system has a simple open loop setup using a phase reconstruction algorithm. This experimental system was effective not only for static phase distortion, but also for the dynamic phase perturbation induced by a thermal convection.

    Original languageEnglish
    Pages (from-to)126-131
    Number of pages6
    JournalOptical Review
    Issue number3
    Publication statusPublished - 2002 May



    • Adaptive optics
    • Liquid crystal
    • Phase reconstruction
    • Phase sensing

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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