Towards zero-th order free, full field of view, computer generated holography

In this study, we investigate the removal of zero-order diffraction (ZOD) in computer-generated holography (CGH) using a destructive interference approach. Our method addresses the common issue of non-modulated light, which manifests as a bright spot at the center of virtual images, by generating a counter-phase light pattern. We demonstrate that our approach can achieve up to 86 ± 2% reduction in ZOD intensity across various holographic techniques, including Fourier and Fresnel transform holography. This method ensures constant alignment, does not compromise the modulation depth of Spatial Light Modulators (SLM), and is computationally efficient. Our findings pave the way for more effective integration of CGH in augmented reality applications, particularly in near-eye displays, by providing clearer and more accurate virtual images.