Gradient descent based algorithm of generating phase-only holograms of 3D images

Area of Science:

• Optics and Photonics
• Computational Imaging
• Holography

Background:

• Fraunhofer diffraction based computer-generated holograms (CGH) reconstruct images on the Fourier plane.
• Fresnel diffraction based CGH reconstruct images in the near field, but often at impractical distances.

Purpose of the Study:

• To propose a novel method for generating computer-generated holograms (CGH) of 3D images.
• To overcome the application difficulties associated with traditional Fresnel diffraction based CGH.

Main Methods:

• Utilizing a Fresnel transform approach.
• Incorporating a Fourier transform lens.
• Employing a gradient descent based algorithm for hologram generation.

Main Results:

• Successfully generated holograms for 3D images using the proposed Fresnel transform method.
• Demonstrated a viable alternative to existing CGH techniques.

Conclusions:

• The proposed Fresnel transform method with a Fourier lens and gradient descent offers an effective way to generate 3D image holograms.
• This approach addresses the distance limitations of conventional Fresnel CGH, enhancing practical applications.