We present a simultaneous dual-wavelength phase-imaging digital holographic technique demonstrated on porous coal samples. The use of two wavelengths enables us to increase the axial range at which the unambiguous phase imaging can be performed, but also increases the noise. We employ a noise reduction “fine map” algorithm, which uses the two-wavelength phase map as a guide to correct a single-wavelength phase image. Then, the resulting noise of a fine map is reduced to the level of single-wavelength noise. A comparison to software unwrapping is also presented. A simple way of correcting a curvature mismatch between the reference and the object beams is offered.
© 2008 Optical Society of America
Original Manuscript: March 3, 2008
Revised Manuscript: May 9, 2008
Manuscript Accepted: May 16, 2008
Published: June 6, 2008
Vol. 3, Iss. 7 Virtual Journal for Biomedical Optics
Alexander Khmaladze, Alejandro Restrepo-Martínez, Myung Kim, Roman Castañeda, and Astrid Blandón, "Simultaneous dual-wavelength reflection digital holography applied to the study of the porous coal samples," Appl. Opt. 47, 3203-3210 (2008)