Improving performance of single-pass real-time holographic projection

• Published in: Optics communications Vol. 457; p. 124666
• Main Authors: Christopher, Peter J., Mouthaan, Ralf, Bheemireddy, Vamsee, Wilkinson, Timothy D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-02-2020
• Subjects: Computer generated holography; Holographic displays; One-step phase-retrieval; Single-transform time-multiplexed; One-step phase-retrieval; Computer generated holography; Single-transform time-multiplexed; Holographic displays
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2019.124666

This work describes a novel approach to time-multiplexed holographic projection on binary phase devices. Unlike other time-multiplexed algorithms where each frame is the inverse transform of independently modified target images, Single-Transform Time-Multiplexed (STTM) hologram generation produces multiple sub-frames from a single inverse transform. Uniformly spacing complex rotations on the diffraction field then allows the emulation of devices containing 2N modulation levels on binary devices by using N sub-frames. In comparison to One-Step Phase Retrieval (OSPR), STTM produces lower mean squared error for up to N=5 than the equivalent number of OSPR sub-frames with a generation time of 1N of the equivalent OSPR frame. A mathematical justification of the STTM approach is presented and a hybrid approach is introduced allowing STTM to be used in conjunction with OSPR in order to combine performance benefits.