Journal ArticleDOI
Microstructuring of diamond bulk by IR femtosecond laser pulses
Taras V. Kononenko,Matthias Meier,Maxim S. Komlenok,Sergej M. Pimenov,Valerio Romano,V P Pashinin,Vitali I. Konov +6 more
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TLDR
In this article, the fabrication of graphitic microstructures in the bulk of chemical vapor deposited (CVD) diamond using 120-fs laser pulses at 800-nm wavelength is studied with Raman spectroscopy.Abstract:
We report the fabrication of graphitic microstructures in the bulk of chemical vapor deposited (CVD) diamond using 120-fs laser pulses at 800-nm wavelength. The nature of the laser-modified region and generation of mechanical stresses in the surrounding diamond is studied with Raman spectroscopy. A spontaneous growth of the laser-modified region from the focal plane towards the laser has been visualized in the process of multipulse irradiation with different pulse energies. The formation of discrete or continuous graphitized structures is revealed depending on the varied local laser intensity. The physical processes governing the appearance of separate graphitic globules and continuous extension of the graphitized region are discussed. Controlling the laser irradiation conditions permits us to fabricate graphitic wires with typical length of 150 μm and diameter of 1.5 μm. The longer, 300-ps pulses, as applied to laser microstructuring of the CVD diamond bulk, are found to be inappropriate due to the stronger influence of structural defects on the damage threshold, the noticeable fluctuation of the structure diameter over the length and the pronounced cracking of the surrounding diamond.read more
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Micromachining along a curve: Femtosecond laser micromachining of curved profiles in diamond and silicon using accelerating beams
Amaury Mathis,François Courvoisier,Luc Froehly,Luca Furfaro,Maxime Jacquot,Pierre-Ambroise Lacourt,John M. Dudley +6 more
TL;DR: In this article, femtosecond laser micromachining of micron-size curved structures using tailored accelerating beams is reported, with surface curvatures as small as 70μm in both diamond and silicon.
Journal ArticleDOI
Laser in micro and nanoprocessing of diamond materials
TL;DR: In this article, the possibility to laser produce conductive and hollow structures in the diamond bulk, including curved elements, is demonstrated, and the techniques of laser assisted diamond CVD, that allow production of smooth or selective-area grown films are presented.
Journal ArticleDOI
Three dimensional laser microfabrication in diamond using a dual adaptive optics system
TL;DR: It is shown that aberration compensation is essential for the generation of controlled micron-scale features at depths greater than 200 μm, and the dual adaptive optics approach demonstrates increased fabrication efficiency relative to experiments using a single adaptive element.
Journal ArticleDOI
Femtosecond laser microstructuring in the bulk of diamond
Taras V. Kononenko,Maxim S. Komlenok,V P Pashinin,Sergej M. Pimenov,Vitali I. Konov,Martin Neff,Valerio Romano,Willy Lüthy +7 more
TL;DR: In this article, the fabrication of graphitic microstructures in the bulk of diamond using 120-fs-laser pulses at 800-nm wavelength was reported, where high-aspect-ratio graphitic wires were fabricated.
Journal ArticleDOI
Graphite distributed electrodes for diamond-based photon-enhanced thermionic emission solar cells
Marco Girolami,Luigino Criante,Fabio Di Fonzo,Sara Lo Turco,Alessandro Mezzetti,Andrea Notargiacomo,Marialilia Pea,Alessandro Bellucci,Paolo Calvani,Veronica Valentini,Daniele M. Trucchi +10 more
TL;DR: Graphite conductive vertical microchannels, fabricated by femtosecond laser treatment, are proposed as distributed electrodes in defect-engineered (black) single-crystal diamond cathodes for innovative solar cells.
References
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Journal ArticleDOI
Self-organized nanogratings in glass irradiated by ultrashort light pulses
TL;DR: Periodic nanostructures are observed inside silica glass after irradiation by a focused beam of a femtosecond Ti:sapphire laser, resulting in the periodic modulation of electron plasma concentration and the structural changes in glass.
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Femtosecond Optical Breakdown in Dielectrics
M. Lenzner,Jörg Krüger,S. Sartania,Zhao Cheng,Ch. Spielmann,Gerard Mourou,Wolfgang Kautek,Ferenc Krausz +7 more
TL;DR: In this article, 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.
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Photowritten optical waveguides in various glasses with ultrashort pulse laser
TL;DR: In this article, permanent optical waveguides can be formed in various bulk glasses by photoinduced refractive index change with an ultrashort pulse laser, which can be fabricated by focusing the laser beam through an microscope objective and translating the sample parallel to the axis of the beam.
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Ablation of solids by femtosecond lasers: ablation mechanism and ablation thresholds for metals and dielectrics
TL;DR: In this paper, the mechanism of ablation of solids by intense femtosecond laser pulses is described in an explicit analytical form, and the formulas for ablation thresholds and ablation rates for metals and dielectrics, combining the laser and target parameters, are derived and compared to experimental data.
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Laser-induced breakdown and damage in bulk transparent materials induced by tightly focused femtosecond laser pulses
TL;DR: In this paper, the authors present a method for measuring the threshold intensity required to produce breakdown and damage in the bulk, as opposed to on the surface, of the material, and determine the relative role of different nonlinear ionization mechanisms for different laser and material parameters.