Improvement of the dynamic range of a fiber specklegram sensor based on volume speckle recording in photorefractive materials

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    In this work, the improvement of the dynamic range of a micro displacement sensor based on fiber specklegrams holographically stored in a photorefractive BSO (Bi12SiO20) crystal is reported. In our experimental setup, a plastic optical fiber (POF) was used to generate a subjective speckle pattern that was recorded in the crystal using a two-wave mixing arrangement. The speckle size was controlled by modifying the diameter of a pupil aperture adjacent to a lens producing the image of the speckle. Fringe patterns were obtained at the output of the system by producing micro displacements of the fiber output end. An increase in the visibility of the fringe patterns was appreciated when the pupil aperture diameter decreased even without controlling the average modulation of the intensity of the light pattern, i.e. when the speckle length increased and the average light modulation simultaneously decreased. This behavior allowed recovering the autocorrelation functions of fringe patterns associated with displacements that initially led to decorrelation, and therefore, significantly to improve the dynamic range of the metrological system. To the best of our knowledge this is the first report about the influence of speckle size on the dynamic range of fiber specklegrams sensors recorded on photorefractive materials.

    Original languageEnglish
    Pages (from-to)473-480
    Number of pages8
    JournalOptics and Lasers in Engineering
    Issue number3
    StatePublished - Mar 2011

    Bibliographical note

    Funding Information:
    J.A. Gómez acknowledges the financial support of the Politécnico Colombiano Jaime Isaza Cadavid for his PhD studies and for the resources for the research project 2061090125 . A. Salazar and H. Lorduy G. acknowledge the financial support of the Universidad Pontificia Bolivariana , Medellín-Colombia, and its Centro de Investigación para el Desarrollo y la Innovación, CIDI, through the research project 635A-02/10-27 .


    • Fiber optics sensors
    • Fiber specklegrams
    • Photorefractive
    • Volume grating


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