Magnification and quality improvement for an optical cylindrical holographic display.

Cylindrical holograms have been widely studied for their 360° display properties and have remained in the theoretical stage for a long time because of the difficulty to manufacture cylindrical spatial light modulators (SLMs). Recently, an optical realization of cylindrical holography using a planar SLM that converts planar holography into cylindrical holography through a conical mirror has been proposed. However, the magnification and quality improvement of the reconstruction have remained issues from the original method that still must be addressed. In this paper, a Fourier hologram optimization with stochastic gradient descent (FHO-SGD) is proposed for the magnification and quality improvement of an optical cylindrical holographic display. The reconstructed object is magnified 2.9 times by a lens with a focal length of 300 mm due to the optical properties of Fourier holograms. In addition, the quality of the reconstructed objects is significantly improved. Numerical simulation and optical experiments demonstrate the effectiveness of the proposed FHO-SGD method in the magnification and quality improvement of an optical cylindrical holographic display.