Abstract
Fresnel incoherent correlation holography (FINCH) was a milestone in incoherent holography. In this roadmap, two pathways, namely the development of FINCH and applications of FINCH explored by many prominent research groups, are discussed. The current state-of-the-art FINCH technology, challenges, and future perspectives of FINCH technology as recognized by a diverse group of researchers contributing to different facets of research in FINCH have been presented.
Highlights
Created with a spatial light modulator or a diffracting optical element
Many single-shot techniques have been proposed [13,34,46,47,48,49,50,51], utilizing dual-phase gratings works with any image sensor in principle, which is useful for optimizing an optical setup with respect to cost, robustness to noise, frame rate, pixel pitch, quantization level, and the number of pixels
In conclusion, we have demonstrated Fresnel incoherent correlation holography (FINCH) using a geometric phase (GP) lens as a compact imager with a low cost than all the versions of FINCH discussed in the previous sections
Summary
The pattern recognition approach to FINCH has reduced the required number of camera shots from three to one. A recent simulative study revealed that the performance of FINCH in the pattern recognition approach was nearly independent of the characteristics of the interfering beams [36]. An iterative algorithm was designed recently to generate synthetic PSHs, which when correlated with the original PSH creates a donut-shaped intensity. This synthetic PSH, when correlated with object holograms, generated edge-enhanced image reconstructions. This direction needs to be explored further to understand the capabilities and limits of synthetic beam shaping [61]
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