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Sapphire Diffractive Axicon milled with Femtosecond Laser Ablation for Imaging Applications
* 1 , 1 , 1 , 1 , 2 , 1
1  Swinburne University of Technology
2  University of Tartu
Academic Editor: Kaupo Kukli

Published: 13 March 2023 by MDPI in Holography Meets Advanced Manufacturing session Advanced Manufacturing posters
Abstract:

We show that a single pulse burst fabrication will produce a flatter and smoother profile of axicons milled on sapphire compared to a pulse overlapped fabrication which will result in a damaged and a 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 lesser number of processing steps is highly desirable and cost-effective. Our results were achieved with femtosecond laser fabrication technology which has revolutionized the field of manufacturing axicons. This study shows the manufacture of three configurations such as the conventional axicon, a photon sieve axicon (PSA) and a sparse PSA directly milled onto a sapphire substrate. Debris was removed using IsoPropyl alcohol and potassium hydroxide and amorphous sapphire was redeposited under incoherent illumination to test the components for optical viability. A non-linear optical filter was used for cleaning noisy images which were generated by diffractive optical elements.

Keywords: Femtosecond Ablation; Imaging; Axicon;
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The synthesis of three different configurations, including sparse PSA milled directly on a sapphire substrate, normal axicon, and photon sieved axicon (PSA). The amorphous sapphire was re-deposited under incoherent light to assess the optical viability of the components after debris was eliminated using potassium hydroxide and isopropyl alcohol[url=https://skibidi-toilet.io/]skibidi toilet[/url].
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We account for super-resolution computational diffraction during the inverse retrieval. The optical architecture of the lens makes use of a local light aperture time coding modulator.
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This study shows the manufacture of three configurations such as the conventional axicon, a photon sieve axicon (PSA) and a sparse PSA directly milled onto a sapphire substrate.
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patrick rall
The study demonstrates a significant improvement in surface quality and fabrication speed, achieving smoother profiles in just 10 minutes. The application of femtosecond laser technology is particularly noteworthy, highlighting its transformative impact on manufacturing micro-optical components. The innovative approach to debris removal and the validation of optical viability further enhance the practical relevance of this research. This work marks a substantial advancement in the cost-effective production of high-quality axicons.

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The study demonstrates a significant improvement in surface quality and fabrication speed, achieving smoother profiles in just 10 minutes. The application of femtosecond laser technology is particularly noteworthy, highlighting its transformative impact on manufacturing micro-optical components. The innovative approach to debris removal and the validation of optical viability further enhance the practical relevance of this research. This work marks a substantial advancement in the cost-effective production of high-quality axicons.

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The advancements in femtosecond laser ablation for creating sapphire diffractive axicons are truly fascinating! It's incredible to see how precise technology can open up new possibilities in imaging applications. The level of detail and accuracy that can be achieved with femtosecond lasers is simply mind-blowing.

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This study highlights the advantages of single pulse burst fabrication for achieving smoother and more precise axicons on sapphire compared to traditional methods. slice master

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