Direct Measurement Of The Amplitude And The Phase Of Photorefractive Fields In Knbo3-Ta And Batio3

    Authors

    W. B. Lawler; C. J. Sherman;M. G. Moharam

    Comments

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    Abbreviated Journal Title

    J. Opt. Soc. Am. B-Opt. Phys.

    Abstract

    Real-time direct measurement of the amplitude and the phase of photorefractive fields is performed for all stages of photorefractive grating formation including saturation. The photorefractive processes in tantalum-doped potassium niobate and nominally pure barium titanate crystals are investigated as a function of the grating spacing. The diffusion and photovoltaic transport lengths, the Debye screening length, and the net trap concentration are determined. Independent direct measurement of the photorefractive phase permits a more accurate and reliable comparison between experimental results and existing models. The measurement technique involves the diffraction of an amplitude-modulated laser beam by an acousto-optic Bragg cell operating with the same laser modulation frequency. The photorefractive gratings are formed by the interference of the transmitted and diffracted components of the beam. This nondestructive measurement technique produces excellent sensitivity and signal-to-noise ratio. The heterodyne detection scheme results in a dynamic range of 50-dB and a phase measurement accuracy of 2-degrees.

    Journal Title

    Journal of the Optical Society of America B-Optical Physics

    Volume

    8

    Issue/Number

    10

    Publication Date

    1-1-1991

    Document Type

    Article

    Language

    English

    First Page

    2190

    Last Page

    2195

    WOS Identifier

    WOS:A1991GJ65500024

    ISSN

    0740-3224

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