Holographic in-line computational imaging

The research aim for this thesis was to build an off—axis digital holographic imaging setup using at least two or up to three different laser sources and a standard industrial camera. This multiwavelength off—axis holographic approach is expected to extend the depth of field and spatial depth resolution of classical ICI through digital image propagation into different depth positions. The optical recording and reconstruction of 3D digital holograms utilizing optoelectronic devices and computational imaging are presented in this thesis. Because a hologram contains both the intensity and phase information about the object, the digital holography approach enables the capture and reconstruction of three—dimensional representations of real objects with improved spatial depth resolution. We devised an experimental setup (a modified Michaelson interferometer) that enabled the optical recording (construction) of digital holograms (DHs) from real three—dimensional objects onto a CMOS camera, and the separation of the real image term from the DC term in Fourier space was obtained by the off—axis technique and visualized in Python. The digital refocusing and reconstruction of the hologram using the angular spectrum propagation method and the implementation of three different lasers with different frequencies for developing a multiwavelength off— axis digital holography system are discussed. The entire process was carried out with a single holographic experimental setup.