Polarization phase-shifting interferometric technique for complete evaluation of birefringence

Area of Science:

• Optics and Photonics
• Materials Science
• Interferometry

Background:

• Birefringence characterization is crucial for understanding anisotropic materials.
• Existing methods may lack simultaneous measurement of magnitude and orientation.
• Full-field techniques offer advantages in speed and spatial information.

Purpose of the Study:

• To present a novel full-field technique for simultaneous measurement of birefringence magnitude and orientation.
• To demonstrate the utility of a monolithic birefringence-sensitive interferometer.
• To enable precise characterization of optically transmissive anisotropic materials.

Main Methods:

• Development of a monolithic birefringence-sensitive interferometer.
• Utilizing a polarization-masked cube beam splitter to generate orthogonally polarized beams.
• Employing an algorithm with eight polarization phase-shifted interferograms for data analysis.

Main Results:

• Simultaneous measurement of birefringence magnitude and orientation achieved.
• Interference fringes successfully encoded information on birefringence phase and fast axis orientation.
• Experimental validation using the developed algorithm and interferograms.

Conclusions:

• The presented technique provides a robust method for full-field birefringence characterization.
• The monolithic interferometer design simplifies simultaneous measurement.
• This advancement aids in the detailed analysis of anisotropic material properties.