Abstract
Digital holography (DH) is a promising technique for modern three-dimensional (3D) imaging. Coherent holography records the complex amplitude of a 3D object holographically, giving speckle noise upon reconstruction and presenting a serious drawback inherent in coherent optical systems. On the other hand, incoherent holography records the intensity distribution of the object, allowing a higher signal-to-noise ratio as compared to its coherent counterpart. Currently there are two incoherent digital holographic techniques: optical scanning holography (OSH) and Fresnel incoherent correlation holography (FINCH). In this review, we first explain the principles of OSH and FINCH. We then compare, to some extent, the differences between OSH and FINCH. Finally, some of the recent applications of the two incoherent holographic techniques are reviewed.
Highlights
The demand for three-dimensional (3D) imaging [1,2] has been increasing more and more in recent years
Fresnel incoherent correlation holography (FINCH) is a revival of common-path incoherent holography, and the difference between the various techniques is the use of a spatial light modulator (SLM) and digital optics such as the numerical calculations of diffraction integrals and phase-shifting interferometry
Hologram of two coins recorded by optical scanning holography (OSH): (a) real part, and (b)
Summary
The demand for three-dimensional (3D) imaging [1,2] has been increasing more and more in recent years. For a source with a high spatial coherence but low temporal coherence, interference can be performed when the time delay between the object light and the reference light is smaller than the coherence time. This is the fundamental concept of “low-coherence DH”, which has been applied to perform 3D imaging and sectional reconstruction [8,9,10,11,12]. Holographic recording by using a source with a high temporal coherence but low spatial coherence is more difficult, because it is difficult to generate a mutually coherent reference light from such a light source. FINCH is a revival of common-path incoherent holography, and the difference between the various techniques is the use of a SLM and digital optics such as the numerical calculations of diffraction integrals and phase-shifting interferometry
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