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Digital holographic illumination using a single phase-only computer-generated hologram.

Phoebe Xin Gao, Yuanbo Deng, Daping Chu

|August 12, 2025

Summary

This study optimizes phase-only computer-generated holograms (CGHs) for digital holographic illumination, reducing color dispersion and enhancing image quality. Findings guide scalable solutions for smart lighting and energy-efficient displays.

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Area of Science:

Optics and Photonics
Holography
Display Technology

Background:

Digital holographic illumination requires optimized phase-only computer-generated holograms (CGHs).
Color dispersion and speckle noise degrade perceived image quality in holographic displays.
Liquid Crystal on Silicon (LCoS) spatial light modulators (SLMs) are key components.

Purpose of the Study:

To investigate methods for optimizing single phase-only CGHs for digital holographic illumination.
To reduce color dispersion and improve image quality.
To analyze the impact of coherence, speckles, hologram size, and LCoS SLM size.

Main Methods:

Exploration of coherence properties of multi-wavelength light sources.
Analysis of hologram size effects on illumination performance.
Investigation of LCoS SLM size trade-offs for resolution and noise.

Main Results:

Identified key parameters influencing speckle contrast and image sharpness.
Demonstrated the impact of multi-wavelength coherence on holographic illumination.
Established relationships between SLM size, resolution, and noise reduction.

Conclusions:

Optimizing CGHs is crucial for high-quality digital holographic illumination.
Understanding trade-offs between speckles, sharpness, and system parameters is essential.
Findings provide a foundation for scalable smart lighting and energy-efficient display applications.