Single-shot dual-wavelength off-axis quasi-common-path digital holography using polarization-multiplexing

Area of Science:

• Optical Imaging
• Metrology
• Holography

Background:

• Quantitative phase imaging (QPI) is crucial for label-free microscopy.
• Traditional QPI methods often require complex setups or multiple measurements.
• Developing single-shot, high-resolution QPI techniques remains a challenge.

Purpose of the Study:

• To develop a dual-wavelength off-axis digital holography system for single-shot QPI.
• To utilize polarization-multiplexing to separate wavelengths and enable simultaneous phase measurement.
• To validate the system's performance using standard calibration targets.

Main Methods:

• A dual-wavelength off-axis quasi-common-path digital holography setup was designed.
• Polarization-multiplexing with a polarizing beam splitter and retro-reflector mirrors was employed.
• A division algorithm was used for reconstructing phase and height information from a single multiplexed interferogram.

Main Results:

• The system successfully separated dual-wavelength information in a single shot.
• Quantitative phase and height maps were reconstructed with high accuracy.
• Experimental validation on square and circular step targets demonstrated the setup's validity and stability.

Conclusions:

• The proposed dual-wavelength digital holography technique offers a robust and stable method for single-shot QPI.
• The polarization-multiplexing approach simplifies the experimental setup and enhances measurement efficiency.
• This technique holds potential for various applications requiring precise, non-invasive metrology.