Speckle reduction for single sideband-encoded computer-generated holograms by using an optimized carrier wave

Area of Science:

• Optics and Photonics
• Digital Imaging
• Holography

Background:

• Speckle noise is a major challenge in computer-generated holography (CGH), degrading the quality of 3D displays.
• Random phase distributions in carrier waves, used for wide viewing angles and shallow depth of focus (DOF), are a primary source of this noise.

Purpose of the Study:

• To propose and validate a novel technique for speckle noise reduction in single sideband (SSB)-encoded holograms.
• To enhance image quality in arbitrary 3D object holography by minimizing carrier wave-induced speckle.

Main Methods:

• Developed a method to optimize the random carrier wave during hologram synthesis.
• Focused on achieving a uniform amplitude distribution of the carrier wave at the object's location.
• Ensured consistent uniform amplitude at specific depth planes to mitigate speckle.

Main Results:

• Demonstrated significant reduction in speckle noise originating from the carrier wave.
• Validated the proposed technique through both numerical simulations and optical experiments.
• Achieved improved image quality in holographic displays.

Conclusions:

• The proposed carrier wave optimization effectively reduces speckle noise in SSB-encoded holograms.
• This technique offers a viable solution for enhancing the visual fidelity of CGH.
• The method is applicable to a wide range of 3D objects and holographic display systems.