Fast fabrication of optical vortex generators by femtosecond laser ablation

Hua, Jian‐Guan; Tian, Zhen‐Nan; Xu, Shihan; Lundgaard, Stefan; Juodkazis, Saulius

doi:10.1016/j.apsusc.2018.12.249

Cited by 17 publications

(11 citation statements)

References 27 publications

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“…The maximum efficiency achievable with the binary QRL is only about 40%, which can be improved to >90% by manufacturing a greyscale version of the QRL. With the latest advancements in rapid fabrication technologies and nanoimprint techniques, mass production of greyscale QRL is not expensive in comparison to using active devices such as SLM [65][66][67][68].…”

Section: Discussionmentioning

confidence: 99%

Compact Incoherent Multidimensional Imaging Systems Using Static Diffractive Coded Apertures

Anand¹,

Ng²,

Katkus³

et al. 2023

Holography - Recent Advances and Applications

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Incoherent holographic imaging technologies, in general, involve multiple optical components for beam splitting—combining and shaping—and in most cases, require an active optical device such as a spatial light modulator (SLM) for generating multiple phase-shifted holograms in time. The above requirements made the realization of holography-based products expensive, heavy, large, and slow. To successfully transfer the holography capabilities discussed in research articles to products, it is necessary to find methods to simplify holography architectures. In this book chapter, two important incoherent holography techniques, namely interference-based Fresnel incoherent correlation holography (FINCH) and interferenceless coded aperture correlation holography (I-COACH), have been successfully simplified in space and time using advanced manufacturing methods and nonlinear reconstruction, respectively. Both techniques have been realized in compact optical architectures using a single static diffractive optical element manufactured using lithography technologies. Randomly multiplexed diffractive lenses were manufactured using electron beam lithography for FINCH. A quasi-random lens and a mask containing a quasi-random array of pinholes were manufactured using electron beam lithography and photolithography, respectively, for I-COACH. In both cases, the compactification has been achieved without sacrificing the performances. The design, fabrication, and experiments of FINCH and I-COACH with static diffractive optical elements are presented in details.

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Section: Discussionmentioning

confidence: 99%

Compact Incoherent Multidimensional Imaging Systems Using Static Diffractive Coded Apertures

Anand¹,

Ng²,

Katkus³

et al. 2023

Holography - Recent Advances and Applications

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“…At present, extremely expensive and poorly scalable methods of electron and ion-beam lithography remain the main approaches for the fabrication of highly efficient PBOEs with a resolution of at least 100 nm. At the same time, we note attempts to use high-performance laser fabrication methods: laser-induced multiphoton photopolymerization and direct laser ablation of thin metal films for the production of PBOEs for the optical spectral range [303,304]. An example of such a PBOE formed by nanogratings photopolymerized on the surface of a quartz substrate, intended for the generation of OVs with a TC equal to 1, is shown in Fig.…”

Section: Pancharatnam±berry Optical Phase Elementmentioning

confidence: 99%

Phase singularities and optical vortices in photonics

et al. 2021

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Since the second half of the 20th century, ideas to develop methods for the formation of optical vortices (OVs) or OV beams Ð regions of circular motion of energy flow in an electromagnetic wave around so-called phase singularity points Ð have become widespread. Such optical beams are unique because of the special spiral shape of the wave front, endowing them with orbital angular momentum (OAM) that can be transferred to matter and cause rotation of nano-and micro-objects. Presently, OV beams are actively used to solve both applied and fundamental problems in optics and photonics. We systematically discuss the development stages and the main advantages and disadvantages of methods for the formation of OV beams, from the appearance of phase singularities in light scattering in inhomogeneous media to the latest developments in vortex microlasers for controlled generation of light fields with a predefined OAM on nano-and microscales.

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“…Galvanometric laser scanning (GLS) systems allow for the rapid reflection of the laser spot, with high positional repeatability and accuracy. As a result, GLS systems are common within a wide range of applications, including automotive collision avoidance [ 1 ], medical imaging [ 2 ], and materials processing [ 3 ]. This work focuses on robotic laser processing applications, i.e., remote laser cutting, forming, welding, or marking, that require an expanded workspace and more degrees of freedom than what the GLS systems offer.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Scanning Applied for Flexible and In Situ Calibration of Galvanometric Scanner Systems

Mikkelstrup

Nikolov

Kristiansen

2023

Sensors

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Galvanometric laser scanner (GLS) systems are widely used for materials processing due to their high precision, processing velocity, and repeatability. However, GLS systems generally suffer from scan field distortions due to joint and task space relationship errors. The problem is further pronounced in robotic applications, where the GLS systems are manipulated in space, as unknown errors in the relative pose of the GLS can be introduced. This paper presents an in situ, data-driven methodology for calibrating GLS systems using 3D scanning, emphasising the flexibility, generalisation, and automated industrial integration. Three-dimensional scanning serves two primary purposes: (1) determining the relative pose between the GLS system and the calibration plate to minimise calibration errors and (2) supplying an image processing algorithm with dense and accurate data to measure the scan field distortion based on the positional deviations of marked fiducials. The measured deviations are used to train a low-complexity Radial Basis Function (RBF) network to predict and correct the distorted scan field. The proposed method shows promising results and significantly reduces the scan field distortion without the use of specialised calibration tools and with limited knowledge of the optical design of the GLS system.

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Fast fabrication of optical vortex generators by femtosecond laser ablation

Cited by 17 publications

References 27 publications

Compact Incoherent Multidimensional Imaging Systems Using Static Diffractive Coded Apertures

Compact Incoherent Multidimensional Imaging Systems Using Static Diffractive Coded Apertures

Phase singularities and optical vortices in photonics

Three-Dimensional Scanning Applied for Flexible and In Situ Calibration of Galvanometric Scanner Systems

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