An optical structure which combines a Fresnel zone plate with an induced convex lens on a PLZT substrate has been proposed to enable initial focusing under no applied potential, a continuous range of short focal distances, and the ability to switch the focal point to infinity. The transmitted optical field was analytically described and a simple formula was derived that demonstrated the dependence of the new focal length on each focusing mechanism. The numerical example provided showed a continuous change of focal length of about 16% while maintaining a good parabolic shape of the induced lens.


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    Title :

    Continuous variation in Fresnel lens focal length


    Contributors:
    Castro, F. (author) / Nabet, B. (author)

    Published in:

    Proceedings of LEOS'94 ; 1 ; 136-137 vol.1


    Publication date :

    1994-01-01


    Size :

    147733 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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