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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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Cite this document: 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. doi:10.1038/s41598-017-00589-8
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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

Open Access document in PolyPublie
Subjects: 2500 Génie électrique et électronique > 2500 Génie électrique et électronique
2500 Génie électrique et électronique > 2505 Dispositifs et réseaux photoniques
3100 Physique > 3100 Physique
3100 Physique > 3111 Laser
3100 Physique > 3112 Photonique
Department: Département de génie électrique
Département de génie physique
Research Center: POLY-GRAMES - Centre de recherche avancée en micro-ondes et en électronique spatiale
Funders: CRSNG/NSERC, FCI/CFI
Date Deposited: 20 Feb 2019 12:33
Last Modified: 21 Feb 2019 01:20
PolyPublie URL: https://publications.polymtl.ca/3541/
Document issued by the official publisher
Journal Title: Scientific Reports (vol. 7)
Publisher: Springer Nature
Official URL: https://doi.org/10.1038/s41598-017-00589-8

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