Random technique to encode complex valued holograms with on axis reconstruction onto phase-only displays.

Area of Science:

• Optics and Photonics
• Digital Holography
• Diffractive Optics

Background:

• Digital holography typically requires complex encoding strategies for amplitude and phase.
• Existing methods can be computationally intensive or require iterative reconstruction.

Purpose of the Study:

• To propose and experimentally validate a new, computationally efficient technique for encoding both amplitude and phase in digital holography.
• To enable on-axis complex field reconstruction without iterative algorithms.

Main Methods:

• Random spatial multiplexing of two phase-only diffractive patterns: one for phase, one for amplitude control.
• Utilizing a diverging optical element for amplitude modulation.
• Implementing the technique on a flicker-free phase-only spatial light modulator (SLM).
• Experimental verification using a phase-shifting polarization interferometer.

Main Results:

• Successful encoding of amplitude and phase information in diffracted fields.
• Computationally fast reconstruction of complex fields.
• On-axis reconstruction achieved without iterative processing.
• Experimental demonstration of hologram generation and phase measurement.

Conclusions:

• The proposed random spatial multiplexing technique offers an efficient and fast method for digital holography.
• This approach simplifies the encoding process and reconstruction, making it practical for real-time applications.
• The experimental validation confirms the viability of the technique for generating and reconstructing complex holographic fields.