Imaging with Diffractive Axicons Rapidly Milled on Sapphire by Femtosecond Laser Ablation

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dc.contributor.authorSmith, Daniel
dc.contributor.authorNg, Soon Hock
dc.contributor.authorHan, Molong
dc.contributor.authorKatkus, Tomas
dc.contributor.authorAnand, Vijayakumar
dc.contributor.authorJuodkazis, Saulius
dc.date.accessioned2024-03-28T09:47:28Z
dc.date.available2024-03-28T09:47:28Z
dc.date.issued2023
dc.description.abstractWe show that single-pulse burst fabrication will produce a flatter and smoother profile of axicons milled on sapphire compared to pulse overlapped fabrication which results in a damaged and much rougher surface. The fabrication of large-area (sub-1 cm cross-section) micro-optical components in a short period of time (∼10 min) and with less processing steps is highly desirable and would be cost-effective. Our results were achieved with femtosecond laser fabrication technology which has revolutionized the field of advanced manufacturing. This study compares three configurations of axicons such as the conventional axicon, a photon sieve axicon (PSA) and a sparse PSA directly milled onto a sapphire substrate. Debris of redeposited amorphous sapphire were removed using isopropyl alcohol and potassium hydroxide. A spatially incoherent illumination was used to test the components for imaging applications. Non-linear reconstruction was used for cleaning noisy images generated by the axicons.
dc.identifier.urihttps://doi.org/10.3390/HMAM2-14147
dc.identifier.urihttps://hdl.handle.net/10062/97419
dc.language.isoen
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/857627///CIPHR
dc.relation.ispartofEng. Proc. 2023, 34(1), 26
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectablation
dc.subjectfemtosecond lasers
dc.subjectdiffractive optical elements
dc.subjectimaging
dc.subjectastronomy
dc.titleImaging with Diffractive Axicons Rapidly Milled on Sapphire by Femtosecond Laser Ablation
dc.typeinfo:eu-repo/semantics/articleen

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