Abstract

Digital holography (DH) can record optical field of a three-dimensional (3-D) object, and the 3-D information can be retrieved and processed digitally. Thus, DH has application potential in 3-D sensing and metrology. However, it is hard for conventional DH to record the off-axis object light because of the limitation of the arrayed sensor. In this paper, optical scanning holography (OSH) is proposed to record the off-axis object light. OSH is a scanning-type and single-pixel holographic technique for 3-D imaging. Therefore, OSH can directly record the off-axis object light by using a small sampling pitch. This is, however, a waste of both bandwidth and recording time. For this reason, a new scheme called optical scanning tilt holography (OSTH) is proposed in this paper. In OSTH, the scanning beam is tilted related to the object axis, and thus the off-axis object light can be recorded by using a large sampling pitch. Although the horizontal resolution of OSTH is worse than that of OSH in normal scanning, the axial resolution of OSTH is better than that of OSH. In addition, the reconstruction plane of OSTH is always parallel to that of OSH in normal scanning. Therefore, there is no need of coordinate transformation post to the holographic recording. These features enable OSTH to be applied in depth sensing and stereoscopic imaging.

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