HoloTile RGB: Ultra-fast, Speckle-Free RGB Computer Generated Holography

Abstract

We demonstrate the first use of the HoloTile Computer Generated Holography (CGH) modality on multicolor targets. Taking advantage of the sub-hologram tiling and Point Spread Function (PSF) shaping of HoloTile allows for the reconstruction of high-fidelity, pseudo-digital RGB images, with well-defined output pixels, without the need for temporal averaging. For each wavelength, the target channels are scaled appropriately, using the same output pixel size. We employ a Stochastic Gradient Descent (SGD) hologram generation algorithm for each wavelength, and display them sequentially on a HoloEye GAEA 2.1 Spatial Light Modulator (SLM) in Color Field Sequential (CFS) phase modulation mode. As such, we get full 8-bit phase modulation at 60Hz for each wavelength. The reconstructions are projected onto a camera sensor where each RGB image is captured at once.