FINCH and other methods of incoherent digital holography Conference Paper uri icon

abstract

  • Two directions of evolution of a decade-old digital holography technique, the Fresnel incoherent correlation holography (FINCH) are presented. One has been developed towards achieving optimal performances and the other towards enhancing performances of different techniques. 1. Introduction Incoherent digital holography (IDH) is a general term that refers to a group of methods, all of which capable of recording a three dimensional (3D) scene, illuminated by incoherent light, onto two-dimensional (2D) digital holograms. There are several methods of IDH that can be roughly classified as scanning and non-scanning techniques. Optical scanning holography [1], and multiple view projection holography [2], are well-known examples of IDH scanning methods. Fresnel incoherent correlation holography (FINCH) [3], and self-interference incoherent digital holography [4] are typical representatives of the non-scanning techniques. FINCH inspired from a series of self-interference incoherently illuminated interferometers [5,6], was proposed in 2007 [3]. The generation of self-interference incoherent holograms is based on the principle that every two beams originated from the same object point are coherently interfered in such a manner that their interference pattern contains the information of the intensity and the 3D location of the corresponding object point. However, FINCH is based on an additional unique principle; the self-interference interferometer is implemented on a single optical channel, whereas operations like beam splitting, phase shifting and wavefront modulation are usually realized by a single phase-only spatial light modulator (SLM). The arrangement as a single channel interferometer makes the FINCH system more stable, robust and easier to align than traditional two-channel interferometers. In this article, we survey the two paths of FINCH development, the improving evolution and the application-based evolution, along the last decade.

publication date

  • January 1, 2017