Angle-dependent encoding of multiple asymmetric symbols in a binary phase hologram with a spatial segmentation

Area of Science:

• Optics and Photonics
• Holography
• Information Optics

Background:

• Traditional holography faces limitations in encoding multiple complex asymmetric symbols efficiently.
• Binary holograms offer advantages in fabrication but present challenges in data storage capacity.

Purpose of the Study:

• To develop a novel method for encoding multiple asymmetric symbols into a single binary Fourier hologram.
• To enable selectable reconstruction of multiple images from a single hologram by controlling the incident laser beam angle.

Main Methods:

• Utilizing a combination of spatial segmentation and carrier frequencies for data encoding.
• Employing a special sequence of phase encoding steps and binarization to record asymmetric symbols.
• Optimizing the segmentation function's period to minimize reconstruction quality loss.

Main Results:

• Successfully encoded multiple asymmetric symbols into a single thin binary Fourier hologram.
• Demonstrated that reconstruction quality is maintained with an optimized segmentation function.
• Experimental results confirmed the efficacy of the proposed encoding and reconstruction method.

Conclusions:

• The presented method provides an effective way to encode multiple asymmetric symbols into binary holograms.
• The technique allows for selectable image reconstruction, enhancing holographic display capabilities.
• This approach is practical for designing simple translucent holographic head-up displays.