Single-shot multispectral birefringence mapping by supercontinuum vector beams

Area of Science:

• Optics and Photonics
• Materials Science
• Spectroscopy

Background:

• Birefringence mapping is crucial for characterizing anisotropic materials.
• Current methods often require scanning, limiting speed and resolution.
• Multispectral analysis provides deeper insights into material composition and structure.

Purpose of the Study:

• To demonstrate a single-shot, multispectral birefringence mapping technique.
• To leverage supercontinuum (SC) vector beams for enhanced imaging.
• To achieve high spatial resolution in birefringence measurements.

Main Methods:

• Generation of an SC vector beam using axially symmetric wave plates.
• Utilizing angular-variant polarization modulation to map birefringence in Fourier space.
• Employing a multispectral imaging detector for single-shot data acquisition.
• Compensating for retardance errors across the superbroadband spectrum.

Main Results:

• Achieved single-shot, multispectral birefringence mapping.
• Obtained high resolutions for retardance (0.4°) and azimuthal angle (0.2°).
• Demonstrated a spatial resolution of 60 µm.
• Successfully compensated for wave plate retardance errors.

Conclusions:

• The proposed method offers significant advantages over scanning techniques for birefringence mapping.
• High-speed, high-resolution birefringence imaging spectroscopy is achievable.
• This technique has broad applicability in materials science and optical characterization.