Optimized phase-only hologram generation for high-quality holographic display

Area of Science:

• Optics and Photonics
• Digital Holography
• Image Processing

Background:

• The Gerchberg-Saxton (GS) method is standard for generating phase-only holograms (POH) in holographic displays.
• Limitations in the GS method's constraint strategy degrade display quality.
• Existing solutions include dummy areas, quadratic phase initialization, and modified amplitude constraints.

Purpose of the Study:

• To propose a simple and effective iterative method for optimizing POH.
• To achieve high-quality reconstructed images in holographic displays.
• To combine and improve upon existing POH optimization techniques.

Main Methods:

• A novel iterative method combining zero-padding, quadratic phase initialization, and a modified amplitude constraint strategy.
• The target image is padded and divided into target and non-target regions.
• Optimized parameters (α and β) are used to modify the amplitude constraint applied to the target region.

Main Results:

• Successfully suppressed speckle noise in holographic reconstructions.
• Significantly improved the quality of reconstructed images.
• Validated through both numerical simulations and optical experiments.

Conclusions:

• The proposed iterative method offers a simple yet effective solution for POH optimization.
• The combined approach enhances holographic display performance.
• This method leads to superior reconstructed image quality compared to traditional techniques.