Astigmatism correction and quality optimization of computer-generated holograms for holographic waveguide displays
Wen‐Kai Lin, Osamu Matoba, Bor‐Shyh Lin, Wei‐Chia Su
Abstract
In this manuscript, the astigmatism of the waveguide combiner with a pair of symmetry HOEs was analyzed. The light field can be predicted by the modified convolution formulation of Fresnel diffraction when the information of light passes through the astigmatism causing element. Then the astigmatism can be corrected. The theory was experimentally proved by the system with a phase-only SLM and a diffraction planar waveguide. Furthermore, the image quality of astigmatism corrected phase-type CGHs can be improved via the iteration process. Since the coherence of light source was employed, the temporal averaging method was utilized to avoid speckle noise.
Topics & Concepts
OpticsHolographyAstigmatismWaveguideSpeckle patternDiffractionFresnel diffractionImage qualityCoherence (philosophical gambling strategy)Speckle noiseDiffraction efficiencyHolographic displayFresnel numberPhysicsComputer scienceImage (mathematics)Quantum mechanicsArtificial intelligenceAdvanced Optical Imaging TechnologiesPhotorefractive and Nonlinear OpticsDigital Holography and Microscopy