Abstract
We propose and demonstrate a new concept of incoherent digital holography termed coded aperture correlation holography (COACH). In COACH, the hologram of an object is formed by the interference of light diffracted from the object, with light diffracted from the same object, but that passes through a coded phase mask (CPM). Another hologram is recorded for a point object, under identical conditions and with the same CPM. This hologram is called the point spread function (PSF) hologram. The reconstructed image is obtained by correlating the object hologram with the PSF hologram. The image reconstruction of multiplane object using COACH was compared with that of other equivalent imaging systems, and has been found to possess a higher axial resolution compared to Fresnel incoherent correlation holography.
Highlights
Optical imaging systems are commonly categorized into incoherent and coherent systems
At least two holograms are recorded under identical conditions, with the same coded phase mask (CPM): one hologram called as the object hologram contains the information of the object under observation; another is recorded using a point source, called as the point spread function (PSF) hologram
coded aperture correlation holography (COACH) is a generalized incoherent digital hologram recorder, in the sense that Fresnel incoherent correlation holography (FINCH) [9,10,11, 23] and self-interference incoherent digital holography (SIDH) [27] are special cases of COACH, in which the CPM is a quadratic phase function, rather than the almost arbitrary CPM used for COACH
Summary
Optical imaging systems are commonly categorized into incoherent and coherent systems. FINCH exhibits a modulation transfer function (MTF) whose width is twice of that of any coherent imaging system with the same NA and, unlike regular imaging systems, has a uniform response to all the frequencies below the cutoff frequency [11]. A sectioning-capable FINCH configuration was proposed; a scanning phase pinhole is used to suppress out-of-focus information and achieve better axial resolution [13]. We propose a new incoherent self-informative-reference digital holography system with an improved axial resolution dubbed coded aperture correlation holography (COACH). To the best of our knowledge, this is the first time that random-like phase masks are utilized as coded apertures in incoherent holography systems. The proposed system offers a new method of three-dimensional (3D) holographic encryption for incoherently illuminated, or self-luminous, objects
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