Automated compensation of misalignment in phase retrieval based on a spatial light modulator

Area of Science:

• Optics and Photonics
• Image Processing

Background:

• Phase retrieval is crucial for optical imaging.
• Misalignment in optical systems, particularly in 4f configurations using spatial light modulators (SLMs), can degrade performance.
• Accurate alignment of optical axes and SLM center is essential for reliable phase retrieval.

Purpose of the Study:

• To investigate the impact of misalignment on phase retrieval using optical linear filtering.
• To identify critical parameters for aligning optical axes and SLM center in a 4f setup.
• To develop and validate an electronic compensation method for misalignment effects.

Main Methods:

• Analysis of a 4f optical filtering setup with an SLM in the Fourier domain.
• Identification of key parameters affecting optical axis and SLM center alignment.
• Development of a phase pattern modification technique for electronic compensation.
• Experimental validation of the proposed compensation method.

Main Results:

• Crucial alignment parameters were identified for the 4f optical setup.
• An automated, electronic method to compensate for misalignment was developed.
• Experimental results confirmed the effectiveness of the phase compensation approach.

Conclusions:

• The developed electronic compensation method effectively addresses misalignment issues in SLM-based phase retrieval.
• This technique enhances the robustness and accuracy of optical linear filtering for phase retrieval applications.
• The findings contribute to improved precision in optical system alignment and phase recovery.