Single-lens zero-order noise elimination with Fresnel lens compensation

Area of Science:

• Optics and Photonics
• Display Technologies
• Computational Imaging

Background:

• Computer-generated holography (CGH) is crucial for 3D displays.
• Zero-order noise significantly degrades CGH image contrast and quality.
• Existing methods often involve complex optical configurations.

Purpose of the Study:

• To propose and validate a single-lens system for eliminating zero-order noise in CGH.
• To enhance image sharpness and reconstruction quality in holographic displays.
• To offer a simpler and more compact alternative to conventional 4f systems.

Main Methods:

• A single converging lens focuses light, and a focal-plane mask blocks zero-order noise.
• A lens compensation algorithm corrects for lens-induced distortions.
• Mask modeling is integrated into the Gerchberg-Saxton algorithm for optimization.

Main Results:

• The proposed system effectively suppresses zero-order noise.
• Image sharpness and reconstruction quality are significantly improved.
• Experimental results show a 136% improvement in image integrity at 850 mm propagation distance.
• The system maintains a wider hologram bandwidth at longer distances compared to 4f systems.

Conclusions:

• The single-lens system provides an effective solution for zero-order noise in CGH.
• This approach offers advantages in compactness, image quality, and performance at longer distances.
• The method enhances the practical application of CGH for high-quality 3D displays.