ABSTRACT
This chapter explains the principle of digital holography and introduces various application examples including digital holographic microscopy (DHM). The attraction of digital holography does not require the mechanical movement of optical elements and can observe an object light to be recorded three-dimensionally only by calculation. The attraction of digital holography lies in the ability to dynamically measure the amplitude and phase information of the object light at the same time. In digital holography, a hologram recorded by the image sensor is transferred to a computer to reconstruct the object light by numerical calculation. In inline digital holography, the interference fringe interval becomes gentle as compared with off-axis holography, so the resolution power of the reconstructed image can be increased. Phase-shifting digital holography can reproduce only an object light. However, because it is necessary to record a plurality of holograms, it takes time to record, which is a disadvantage.
