Multiplex holography with chirp-modulated binary phase-coded reference-beam masks

Area of Science:

• Optics and Information Technology
• Digital Signal Processing
• Holography and Optical Engineering

Background:

• Pseudorandom diffuser masks are crucial for multiplex holography.
• Binary codes offer straightforward fabrication for diffuser masks.
• Existing methods may lack optimal correlation properties.

Purpose of the Study:

• To explore the use of binary codes from spread-spectrum communication for diffuser mask construction.
• To introduce a chirp-modulation technique for enhancing binary diffuser masks.
• To numerically compare the correlation properties of modulated and unmodulated masks.

Main Methods:

• Utilizing specific binary codes for pseudorandom diffuser mask fabrication.
• Applying a simple chirp-modulation technique to the binary diffuser masks.
• Performing numerical simulations to evaluate correlation properties.

Main Results:

• Successfully constructed pseudorandom diffuser masks using binary codes.
• Chirp-modulation of binary masks yields improved correlation properties, akin to polyphase masks.
• Numerical comparisons demonstrate the benefits of chirp-modulation for binary diffuser masks.

Conclusions:

• Binary codes are a viable resource for creating effective diffuser masks in multiplex holography.
• Chirp-modulation offers a practical method to enhance binary mask performance without increased fabrication complexity.
• The proposed technique provides a pathway to superior correlation properties for holographic applications.