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Modified astigmatic beam technique for laser writing.
Applied Optics
|March 25, 2022
Summary
Researchers enhanced ultrafast laser writing of optical waveguides. A simple modification to the astigmatic beam technique significantly improves waveguide circularity and fabrication flexibility.
Area of Science:
- Photonics
- Materials Science
- Optical Engineering
Background:
- Ultrafast laser writing offers flexibility and 3D fabrication for optical waveguides and devices.
- The astigmatic beam technique is a common method for creating near-circular waveguides.
Purpose of the Study:
- To significantly improve the circularity and flexibility of ultrafast laser-inscribed optical waveguides.
- To enhance the standard astigmatic beam technique for waveguide fabrication.
Main Methods:
- Superposing a long-focus lens before the laser inscription objective lens.
- Utilizing in situ laser-induced plasma emission imaging for pre-inscription shape optimization.
Main Results:
- Reduced normalized squared radial deviation to <4×10⁻⁴, a substantial improvement over standard astigmatic (>0.1) and Gaussian (>0.7) beams.
