| Autor: |
Lapointe J, Bérubé JP, Dupont A, Bellec M, Vallée R |
| Jazyk: |
angličtina |
| Zdroj: |
Applied optics [Appl Opt] 2022 Mar 20; Vol. 61 (9), pp. 2333-2337. |
| DOI: |
10.1364/AO.454380 |
| Abstrakt: |
The ultrafast laser writing of optical waveguides and devices is increasingly ubiquitous among the photonics community, mostly for its flexibility and three-dimensional fabrication capability. The well-known astigmatic beam technique is the simplest method to inscribe near-circular cross-section waveguides. In this paper, we report on a significant enhancement to the widely used astigmatic beam technique that makes it more flexible and yields a more circular waveguide cross section. By simply superposing a long-focus lens before the laser inscription objective lens, we demonstrate that the normalized squared radial deviation from a perfectly circular waveguide cross section can be reduced to <4×10 -4 , which is a significant improvement compared to >0.1 typically obtained using the standard astigmatic beam technique, or >0.7 with a Gaussian beam. The modified technique also makes it easy to use the full power delivered by the laser, which is not usually the case with the standard technique. A technique to optimize the waveguide shape prior to the inscription by in situ laser-induced plasma emission imaging is also discussed. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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