Space-bandwidth extension in dual-wavelength off-axis digital holography and its application to single-shot three-dimensional surface-shape imaging

Abstract

We present a method for extending the space bandwidth in dual-wavelength off-axis digital holography. By the extension, both the field of view and the resolution are improved without the image degradation caused by the superposition of the 0th-order wave and conjugate image on the object wave. The effectiveness of the proposed method for the application to single-shot three-dimensional surface-shape imaging is numerically and quantitatively verified. The optimal angles of the reference waves in both wavelengths are also quantitatively clarified.