Improvement of the image quality of random phase-free holography using an iterative method

• A proposed method 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).
• In low-resolution holograms, we obtain a good image quality of a reconstructed image using an iterative random phase-free method with virtual convergence light.

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.