2 research outputs found
Numerical investigation of lensless zoomable holographic multiple projections to tilted planes
This paper numerically investigates the feasibility of lensless zoomable
holographic multiple projections to tilted planes. We have already developed
lensless zoomable holographic single projection using scaled diffraction, which
calculates diffraction between parallel planes with different sampling pitches.
The structure of this zoomable holographic projection is very simple because it
does not need a lens; however, it only projects a single image to a plane
parallel to the hologram. The lensless zoomable holographic projection in this
paper is capable of projecting multiple images onto tilted planes
simultaneously
Improvement of the image quality of random phase--free holography using an iterative method
Our proposed method of random phase-free holography using virtual convergence
light can obtain large reconstructed images exceeding the size of the hologram,
without the assistance of random phase. The reconstructed images have
low-speckle noise in the amplitude and phase-only holograms (kinoforms);
however, in low-resolution holograms, we obtain a degraded image quality
compared to the original image. We propose an iterative random phase-free
method with virtual convergence light to address this problem