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  • Title: Phase shifting technique for extended inline holographic microscopy with a pinhole array.
    Author: Graulig C, Kanka M, Riesenberg R.
    Journal: Opt Express; 2012 Sep 24; 20(20):22383-90. PubMed ID: 23037386.
    Abstract:
    Digital inline holographic microscopy using a pinhole for sample illumination allows lensless imaging. To overcome restrictions of the sample size and density in the setup additional reference waves are generated by extending the single pinhole to a regular 2D pinhole array illumination. A technique is presented that uses phase shifting between the pinhole waves. Multiple foci with stable phase differences and a phase error (rms) of 0.027 rad generate pinhole waves which illuminate an undiluted, dense blood smear sample. Amplitude and phase images of the blood sample were successfully reconstructed.
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