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A simple technique to overcome self-focusing, filamentation, supercontinuum generation, aberrations, depth dependence and waveguide interface roughness using fs laser processing

Jérôme Lapointe and Raman Kashyap

Article (2017)

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Abstract

Several detrimental effects limit the use of ultrafast lasers in multi-photon processing and the direct manufacture of integrated photonics devices, not least, dispersion, aberrations, depth dependence, undesirable ablation at a surface, limited depth of writing, nonlinear optical effects such as supercontinuum generation and filamentation due to Kerr self-focusing. We show that all these effects can be significantly reduced if not eliminated using two coherent, ultrafast laser-beams through a single lens-which we call the Dual-Beam technique. Simulations and experimental measurements at the focus are used to understand how the Dual-Beam technique can mitigate these problems. The high peak laser intensity is only formed at the aberration-free tightly localised focal spot, simultaneously, suppressing unwanted nonlinear side effects for any intensity or processing depth. Therefore, we believe this simple and innovative technique makes the fs laser capable of much more at even higher intensities than previously possible, allowing applications in multi-photon processing, bio-medical imaging, laser surgery of cells, tissue and in ophthalmology, along with laser writing of waveguides.

Uncontrolled Keywords

Integrated optics; Laser material processing; Nonlinear optics; Supercontinuum generation; Ultrafast photonics

Subjects: 2500 Electrical and electronic engineering > 2500 Electrical and electronic engineering
2500 Electrical and electronic engineering > 2505 Photonic devices and networks
3100 Physics > 3100 Physics
3100 Physics > 3111 Lasers
3100 Physics > 3112 Photonics
Department: Department of Electrical Engineering
Department of Engineering Physics
Research Center: POLY-GRAMES - Advanced Research Centre in Microwaves and Space Electronics
Funders: CRSNG/NSERC, FCI/CFI
PolyPublie URL: https://publications.polymtl.ca/3541/
Journal Title: Scientific Reports (vol. 7, no. 1)
Publisher: Springer Nature
DOI: 10.1038/s41598-017-00589-8
Official URL: https://doi.org/10.1038/s41598-017-00589-8
Date Deposited: 20 Feb 2019 12:33
Last Modified: 05 Apr 2024 21:11
Cite in APA 7: Lapointe, J., & Kashyap, R. (2017). A simple technique to overcome self-focusing, filamentation, supercontinuum generation, aberrations, depth dependence and waveguide interface roughness using fs laser processing. Scientific Reports, 7(1). https://doi.org/10.1038/s41598-017-00589-8

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