Detection of birefringence singularity by supercontinuum vector beam

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Space-variant retarders are crucial optical components with spatially varying birefringence.
• Understanding and characterizing birefringence singularities is essential for advanced optical applications.
• Supercontinuum vector beams offer unique properties for probing complex optical materials.

Purpose of the Study:

• To demonstrate the detection of birefringence singularity in space-variant retarders with inhomogeneous birefringence.
• To utilize supercontinuum vector beam analysis for measuring birefringence and determining singularity point kinematics.
• To validate the proposed method through numerical calculations and experimental verification.

Main Methods:

• Employing a supercontinuum vector beam to probe a space-variant retarder.
• Analyzing the intensity profile of single-shot images at multiple wavelengths (450, 550, 650 nm).
• Measuring retardance and azimuthal angle to characterize the birefringence singularity.

Main Results:

• Successfully detected birefringence singularity in space-variant retarders.
• Birefringence measurements provided the kinematics of the singularity point.
• Experimental results for retardance changes (e.g., 112° to 131° at 450 nm) closely matched numerical calculations based on singularity position (x0 displacement from 0 to 350 µm).

Conclusions:

• Supercontinuum vector beam analysis is an effective method for detecting and characterizing birefringence singularities.
• The kinematics of singularity points can be accurately determined using this technique.
• The findings validate the potential of this approach for analyzing complex optical materials with inhomogeneous birefringence.