Heterodyne Technique For The Direct Measurement Of The Amplitude And Phase Of Photorefractive Space-Charge Fields

    Authors

    D. G. Gray; M. G. Moharam;T. M. Ayres

    Comments

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    Abbreviated Journal Title

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

    Keywords

    CRYSTALS; BATIO3; PHOTOCONDUCTIVITY; GRATINGS; SHIFT; Optics

    Abstract

    A heterodyne technique is presented for the independent, direct measurement of the amplitude and phase of photorefractive space-charge fields during uninterrupted buildup and photoinduced decay. The technique is based on using a probe beam with a frequency slightly different from that of the two recording beams to continuously read photorefractive phase gratings during all stages of formation and decay. The probe beam is virtually collinear with one of the recording beams. The beat between the diffracted component of the frequency-shifted probe beam and the transmitted component of the recording beam produces a heterodyne beam component. This heterodyne component contains the photorefractive grating information and is monitored to yield the amplitude and phase of the photorefractive fields. This nondestructive characterization technique exhibits excellent sensitivity and permits photorefractive phase measurements to within 1.5-degrees.

    Journal Title

    Journal of the Optical Society of America B-Optical Physics

    Volume

    11

    Issue/Number

    3

    Publication Date

    1-1-1994

    Document Type

    Article

    Language

    English

    First Page

    470

    Last Page

    475

    WOS Identifier

    WOS:A1994NB82200008

    ISSN

    0740-3224

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