[OPTICAL REVIEW Vol. 21, No. 3 (2014) 325-332]
© 2014 The Japan Society of Applied Physics

Complex Wavefront Reconstruction of Digital In-Line Holography with a Spatial Radial Carrier

Nobukazu YOSHIKAWA* and Toshiya KOSEKI

Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan

(Received October 18, 2013; Accepted February 24, 2014)

We propose a method for reconstructing a complex wavefront from a single-shot in-line digital hologram with a spatial radial carrier. In the proposed method, the spatial radial carrier is generated by a point source that is located in front of an image sensor, as close as possible to the sensor with the condition that the Nyquist limit is not exceeded. A signal processing method employed for elimination of the zeroth-order and conjugate wave components is presented. Computer simulations and optical experiments are performed to verify the proposed method.

Key words: digital holography, spatial radial carrier, digital filtering

*E-mail address: nyoshi@mail.saitama-u.ac.jp