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Fs-written Type-A volume Bragg gratings using a phase-mask and burst mode exposure
Optics Express
|August 13, 2025
Summary
This study demonstrates the first Type-A volume Bragg gratings (VBGs) created with a high-power femtosecond laser in burst mode. This method enables efficient 3D material processing for advanced optical applications.
Area of Science:
- Materials Science
- Optics and Photonics
- Laser Physics
Background:
- Volume Bragg gratings (VBGs) are crucial optical components.
- Traditional fabrication methods face limitations in speed and precision for 3D material processing.
Purpose of the Study:
- To pioneer the inscription of Type-A VBGs using a novel femtosecond laser burst mode technique.
- To demonstrate efficient 3D volume material processing with controlled thermal load.
Main Methods:
- Utilized a phase-mask technique with a 100 W average power femtosecond laser operating in burst mode.
- Independently tuned inter-burst and repetition rates to manage thermal load via nonlinear interaction.
- Achieved 3D volume material processing.
Main Results:
- Successfully inscribed an 850 × 900 × 500 µm³ Type-A VBG.
- Achieved a fabrication throughput of 4.1 mm³/h.
- Obtained a diffraction efficiency of approximately 77% at 633 nm.
Conclusions:
- The femtosecond laser burst mode technique offers a viable and efficient method for VBG inscription.
- This approach enables precise 3D volume material processing for optical applications.
- The demonstrated throughput and efficiency highlight the potential for scalable VBG fabrication.
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