A method to numerically remove the twin image for inline digital holography, using multiple digital holograms, is discussed. Each individual hologram is recorded by using a statistically independent speckle field to illuminate the object. If the holograms are recorded in this manner and then numerically reconstructed, the twin image appears as a different speckle pattern in each of the reconstructions. By performing speckle-reduction techniques the presence of the twin image can be greatly reduced. A theoretical model is developed, and experimental results are presented that validate this approach. We show experimentally that the dc object intensity term can also be removed by using this technique.
© 2009 Optical Society of America
Original Manuscript: June 10, 2009
Revised Manuscript: October 15, 2009
Manuscript Accepted: October 23, 2009
Published: November 18, 2009
David S. Monaghan, Damien P. Kelly, Nitesh Pandey, and Bryan M. Hennelly, "Twin removal in digital holography using diffuse illumination," Opt. Lett. 34, 3610-3612 (2009)