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Scalable waveplate for ultraviolet applications using laser-imprinted birefringence in silica
Optics Express
|November 11, 2025
Summary
A new femtosecond laser writing technique fabricates large-aperture waveplates from fused silica. This method precisely controls birefringence for polarization control in laser fusion research.
Area of Science:
- Optics and Photonics
- Materials Science
- Laser Technology
Background:
- Waveplates are crucial optical components for polarization control.
- Existing fabrication methods may have limitations for large-aperture or specific spectral regions.
Purpose of the Study:
- To demonstrate a novel fabrication method for large-aperture waveplates.
- To enable operation in the near-ultraviolet spectral region.
- To achieve precise control over induced birefringence.
Main Methods:
- Femtosecond direct laser writing (DLW) of bulk fused silica.
- Controlled generation of nanopores via laser processing parameters.
- Characterization of optical properties and laser-induced-damage threshold.
Main Results:
- Successfully fabricated large-aperture waveplates.
- Achieved precise control of induced birefringence through nanopore geometry.
- Observed transmission loss of approximately 4% at 351 nm.
- Demonstrated a laser-induced-damage threshold comparable to native fused silica.
Conclusions:
- Femtosecond DLW is a viable method for fabricating near-UV waveplates.
- The technique offers precise birefringence control for polarization applications.
- The fabricated waveplates are suitable for high-power laser systems, including laser fusion research.
