Anamorphic optical transformation of an amplitude spatial light modulator to a complex spatial light modulator with...

Area of Science:

• Optics and Photonics
• Holography
• Spatial Light Modulation

Background:

• Commercial spatial light modulators (SLMs) often have oblong pixels, limiting holographic display applications.
• Converting amplitude-only SLMs to complex SLMs is desirable for advanced holographic imaging.

Purpose of the Study:

• To propose and demonstrate a method for constructing a square pixel complex SLM from an oblong amplitude SLM.
• To enhance the viewing window shape for improved holographic content observation.

Main Methods:

• Utilizing an anamorphic optical filter to reformat the Fourier transform of the spatial light field.
• Rejecting one half-band of the optical Fourier transform and reformatting the other.
• Developing an amplitude computer-generated hologram encoding scheme for optimal transformation.

Main Results:

• Successfully created an effective complex SLM with square pixels from an oblong amplitude SLM.
• Achieved a square viewing window, ideal for observers viewing holographic content.
• Experimentally demonstrated the display of complex holographic 3D images with clear depth discrimination.

Conclusions:

• The proposed method provides an efficient way to create square pixel complex SLMs.
• This technique improves holographic display quality and observer experience.
• The developed system is suitable for generating high-fidelity 3D holographic images.