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Collimation method that uses spiral gratings and Talbot interferometry

C W Chang, D C Su

    Optics Letters
    |September 29, 2009
    PubMed

    Abstract:

    The tested light is projected onto an arrangement composed of two special spiral gratings, in which the second spiral grating is positioned at the Talbot image of the first one. From the shapes of the resultant moiré fringes, the quality of collimation of the tested light can be easily checked.

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