Speckle-free compact holographic near-eye display using camera-in-the-loop optimization with phase constraint

Area of Science:

• Optics and Photonics
• Display Technology
• Computational Imaging

Background:

• Holographic near-eye displays offer high potential for augmented and virtual reality.
• Speckle noise is a significant challenge in holographic reconstructions, degrading image quality.
• Existing methods often require complex setups or compromise image fidelity to reduce speckle.

Purpose of the Study:

• To develop a compact holographic near-eye display system.
• To achieve high-quality, speckle-free optical reconstructions.
• To demonstrate the effectiveness of camera-in-the-loop optimization with a phase constraint strategy.

Main Methods:

• Utilized camera-in-the-loop (CITL) optimization for iterative synthesis of computer-generated holograms (CGHs).
• Implemented a phase constraint strategy during CGH optimization using in-system optical feedback.
• Employed numerical simulations and optical experiments to validate the approach.

Main Results:

• Achieved speckle-free optical reconstructions in a compact holographic near-eye display.
• Demonstrated effective suppression of speckle noise through phase profile smoothing.
• Obtained excellent image fidelity in the reconstructed wave field.

Conclusions:

• The proposed CITL optimization with phase constraint is effective for generating speckle-free holographic displays.
• This method enables high-quality visual reconstructions in compact near-eye display systems.
• The technique significantly improves image fidelity by mitigating speckle noise.