Reconstruction of complex-object using edge point referencing 01/01/2025

Physics

A novel method is proposed and demonstrated experimentally to retrieve the 2D as well as the 3D complex object from its autocorrelation. The method utilizes edge point referencing, therefore, does not require any separate reference to record the hologram. Being common-path, it is robust to external vibrations. The employment of the amplitude shifting in the proposed setup as opposed to phase shifting also avoids using expensive components required to perform phase shifting operation. By choosing the reference point at the desired/illuminated object boundary leads to two-fold improvement in the field-of view as compared to that in off-axis holography. In addition, by keeping the reference point at the desired/illuminated object boundary reduces the highest frequency content (spatial carrier fringes) in the hologram leading to better sampling of the hologram/ recording larger size hologram with same size and pixel resolution of a CCD camera as compared to that in off-axis holography. The proposed method also shows great potential in some practical applications such as in measuring the real time deformation.