13 September 2010 Phase shift error compensation method for digital holography using statistics of speckle field
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Proceedings Volume 7387, Speckle 2010: Optical Metrology; 738706 (2010) https://doi.org/10.1117/12.871117
Event: Speckle 2010, 2010, Florianapolis, Brazil
Abstract
In Digital holography (DH), an in-line optical setup is commonly employed due to relatively low spatial resolution of CCD camera. In DH, a phase shifting method is commonly employed to determine the complex amplitude on the recording plane. In this study, we propose a phase shift error compensation method based on the statistics of the diffraction field of object. In most cases of the measurement using the digital holography, the object has an optically rough surface, and a fully developed speckle field is produced in the diffraction field, i.e., the recording plane. It is well known that the speckle phase takes a uniform probability density function (PDF). This statistical property is very stable and can be used as a constrain in the determination of actual phase shifts. The experiments were performed, and it was demonstrated that the phase shift error is well compensated over a fairly large amount of phase shift error. This method has a great advantage that any modification on ordinary digital holographic system with the phase shifting method is not required since the method utilizes information that was discarded in the conventional method.
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H. Kadono, H. Kadono, M. Kataoka, M. Kataoka, V. D. Madjarova, V. D. Madjarova, } "Phase shift error compensation method for digital holography using statistics of speckle field", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 738706 (13 September 2010); doi: 10.1117/12.871117; https://doi.org/10.1117/12.871117
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