  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.
