femtosecond laser processing by using patterned vector optical fields worksheet

Coherent Excitation and Control of Plasmons on Gold Using Two ...- femtosecond laser processing by using patterned vector optical fields worksheet ,We demonstrate the use of WSe 2 nanocrystals as 2D optical elements for exploring the ultrafast dynamics of SPPs. Using few-femtosecond laser pulse pairs we excite an SPP at the boundary of a WSe 2 crystal and then have a WSe 2 monolayer wedge act as a delay line inducing a spatially varying phase difference down to the attosecond time range ... Complex periodic micro/nanostructures on 6H-SiC crystal ...We present and demonstrate an approach for femtosecond laser processing by using patterned vector optical fields (PVOFs) composed of multiple individual vector optical fields.



Evolution of femtosecond laser-induced periodic structures ...

Femtosecond laser-induced periodic surface structures have opened broad prospects in the aspect of high-efficient and low-cost nanotextured patterning, yet defined great challenges on how to keep the periodicity in a macro area. Herein, we report a transition from non-periodicity to periodicity as the scan strategies changing. By suppressing the transition from the initial structures to the ...

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Laser-patterned compliant electrodes ‒ LMTS ‐ EPFL

The method consists in casting compliant electrodes onto water-soluble sacial substrates (polyvinyl alcohol or PVA), and then patterning the electrode by laser ablation. The patterned electrodes are then transferred to a silicone membrane using oxygen plasma activation. The electrode substrate is subsequently removed by dissolving in hot ...

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Applied Sciences | Free Full-Text | Incident Angle Dependence ...

The results of studying the waveforms of longitudinal and transverse photocurrent pulses generated in thin, semitransparent CuSe/Se films as a function of the angle of incidence ( α) of a femtosecond laser beam at linear and circular polarizations are presented. It has been established that the durations of unipolar longitudinal photocurrent pulses at linear and circular polarizations of ...

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Femtosecond laser machining of steel - SPIE Digital Library

Abstract. Femtosecond laser processing is a promising new technology for the fabrication of micro-scale components from engineering materials, such as metals. In the femtosecond time regime, the ablation process is nearly a solid to vapor transition, thereby providing access to cut smaller features. Sandia National Laboratories has constructed ...

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Laser microprocessing of steel with radially and azimuthally ...

The numerical aperture of the focusing optics is 0.03. Each point was exposed to ∼15 laser pulses, producing spot diameters of 38 ± 10 μm. After processing, we analysed the laser marked spots with an optical microscope. Figure 4(a) shows the LIPSS within the laser spot produced with a linearly polarized beam. The LIPSS formed as recurring ...

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Femtosecond Pulse - an overview | ScienceDirect Topics

Laser ablation uses femtosecond pulses to remove materials in a controlled way from a given substrate surface, creating the desired pattern. It is a one-step process to form interdigit spaces of few micrometers, with the electrode pattern resolution relying on the laser and optical system, dispensing photomasks, and cleanroom facilities.

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Femtosecond Laser Processing by Using Patterned Vector ... - CORE

Femtosecond Laser Processing by Using Patterned Vector Optical Fields . By Kai Lou, Sheng-Xia Qian, Zhi-Cheng Ren, Chenghou Tu, Yongnan Li and Hui-Tian Wang. Cite .

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Femtosecond Laser Processing by Using Patterned Vector ...

The vector optical fields have been confirmed to fabricate microstructures 17, 18, 19. In this paper, we present an approach for fabricating the multi-microholes, by using femtosecond (fs ...

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Ultrashort pulse - Wikipedia

Laser pulse with duration a picosecond (10^-12 s) or less. In optics, an ultrashort pulse, also known as an ultrafast event, is an electromagnetic pulse whose time duration is of the order of a picosecond (10 −12 second) or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators.

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Femtosecond laser fabrication of LIPSS-based ... - ScienceDirect

A fast and reliable method for the fabrication of polarization modifying devices using femtosecond laser is reported. A setup based on line focusing is used for the generation of LIPSS on stainless steel, processing at different speeds between 0.8 and 2.4 mm/s with constant energy per pulse of 1.4 mJ. SEM and AFM characterizations of the LIPSS ...

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Feedback optimization of shaped femtosecond laser pulses for ...

The optimal control of quantum system dynamics using tailored laser fields is experiencing growing success over a diverse array of experiments [1][2][3][4] [5]. In many of these studies, adaptive ...

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Femtosecond-laser generation of self-organized bubble ...

By continuously scanning a femtosecond laser beam across a fused silica specimen, we demonstrate the formation of self-organized bubbles buried in the material. Rather than using high intensity pulses and high numerical aperture to induce explosions in the material, here bubbles form as a consequence of cumulative energy deposits. We observe a transition between chaotic and self-organized ...

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A Hybrid Machine Learning Approach to Determine the Optimal ...

Laser-induced periodic surface structures were fabricated on the surface of Ti6Al4V at different laser processing parameters. The parameters were generated by a uniform sampling method (laser power varied from 1 to 5 mW, scanning speed from 0.5 to 1.5 mm/s and scanning number from 1 to 5 times) as shown in Table 1.

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(PDF) Fused silica ablation by double femtosecond laser ...

Glass processing is a subject of high interest for many industrial fields such as optics manufacturing, smart electronics or medical devices. With respect to nanosecond technology, the use of ...

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High-quality vector vortex arrays by holographic and ...

[45] Lou K, Qian S, Ren Z, Tu C, Li Y and Wang H 2013 Femtosecond laser processing by using patterned vector optical fields Sci. Rep. 3 2281 Go to reference in article Crossref Google Scholar [46] Mikhaylov D, Zhou B, Kiedrowski T, Mikut R and Lasagni A 2019 High accuracy beam splitting using spatial light modulator combined with machine ...

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Periodic microstructures produced by femtosecond laser ...

The periodic microstructures on titanium plate were formed by the irradiation of the femtosecond laser with the laser wavelength of 800 nm and the pulse length of 100 fs. They were oriented to the ...

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Femtosecond Laser - an overview | ScienceDirect Topics

A femtosecond laser was employed to analyze the diffusion profiles and Li-dynamics. Zijlstra et al. [41] did a comprehensive study on bond strength and structural modifications of silicon, TiO 2, and graphene using a femtosecond laser. Molecular dynamics and laser-induced atomic motions were also investigated to determine the thermal evolutions ...

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Femtosecond infrared intrastromal ablation and backscattering ...

The performance of femtosecond (fs) laser intrastromal ablation was evaluated with backscattering-mode adaptive-optics multiphoton microscopy in ex vivo chicken corneas. The pulse energy of the fs source used for ablation was set to generate two different ablation patterns within the corneal stroma at a certain depth.

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Femtosecond laser induced formation of graphene ... - IOPscience

The uniformity of the nanoscale graphene fingers may be explained by the diffraction pattern from optical scattering at the top few layers of the bulk graphite. The laser-induced, periodic, straight ripple structures have also been found on different materials surfaces, and polarization dependencies have been determined to be related to a ...

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Femtosecond Laser Processing by Using Patterned Vector ...

Femtosecond Laser Processing by Using Patterned Vector Optical Fields. Authors. Kai Lou; Sheng-Xia Qian + 4 moreZhi-Cheng Ren; Chenghou Tu; Yongnan Li; Hui-Tian Wang;

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Lasers: Understanding the Basics | lasers | Photonics ...

Ultrafast lasers. Ultrafast lasers are generally defined as lasers that produce pulses in the range of 5 fs to 100 ps (1 femtosecond = 10 −15 seconds). If a laser is able to oscillate in many longitudinal modes, such short pulses can be produced with the so-called mode-locking technique.

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Optics for Spatially Tailored Ultrashort Pulse Laser Beam ...

Lou K, Qian SX, Ren ZC, Tu CH, Li YN, Wang HT (2013) Femtosecond laser processing by using patterned vector optical fields. Sci Rep 3:2281 Google Scholar Martínez-León L, Clemente P, Tajahuerce E, Mínguez-Vega G, Mendoza-Yero O, Fernández-Alonso M, Lancis J, Climent V, Andrés P (2009) Spatial-chirp compensation in dynamical holograms ...

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Phys. Rev. Lett. 80, 4076 (1998) - Femtosecond Optical ...

We report measurements of the optical breakdown threshold and ablation depth in dielectrics with different band gaps for laser pulse durations ranging from 5 ps to 5 fs at a carrier wavelength of 780 nm. For $\\ensuremath{\\tau} <100\\mathrm{fs}$, the dominant channel for free electron generation is found to be either impact or multiphoton ionization (MPI) depending on the size of the band ...

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Ultrafast dynamics observation during femtosecond laser ...

The mechanism of femtosecond laser fabrication, including the phase change and material removal, are essentially determined by laser-electron interactions [ 12 ]. During femtosecond laser fabrication, photons are mainly absorbed by electrons, and the subsequent energy transfer from electrons to ions is of the picosecond order.

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