Formation of periodic surface structures by ultrashort laser pulses

1999 ◽  
Vol 88 (2) ◽  
pp. 370-376 ◽  
Author(s):  
M. B. Agranat ◽  
S. I. Ashitkov ◽  
V. E. Fortov ◽  
S. I. Anisimov ◽  
A. M. Dykhne ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Surface Structures ◽  
Periodic Surface ◽  
Ultrashort Laser

Surface structures induced by ultrashort laser pulses: Formation mechanisms of ripples and grooves

2015 ◽  
Vol 353 ◽  
pp. 1214-1222 ◽  
Author(s):  
Shutong He ◽  
Jijil JJ Nivas ◽  
K.K. Anoop ◽  
Antonio Vecchione ◽  
Minglie Hu ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Surface Structures ◽  
Formation Mechanisms ◽  
Ultrashort Laser

scholarly journals Influence of defects on structural colours generated by laser-induced ripples

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Stella Maragkaki ◽  
Christian A. Skaradzinski ◽  
Ralf Nett ◽  
Evgeny L. Gurevich
Keyword(s):  
Laser Pulses ◽  
Processing Parameters ◽  
Ultrashort Laser Pulses ◽  
Metallic Surface ◽  
Periodic Surface ◽  
Reflected Light ◽  
Surface Patterns ◽  
Micrometer Size ◽  
Induced Defects ◽  
Ultrashort Laser

AbstractThe colourisation of metallic surface which appears due to periodic surface patterns induced by ultrashort laser pulses is studied. Ripples due to the sub-micrometer size of their period act as a diffraction grating, generating structural colours. Carefully chosen strategy of the laser spot scanning allows us to mimic the nanostructures responsible for structural colours of some flowers on the metal substrate. We investigate the correlation between the colourising effects and the artificially-induced defects in the ripples structure and show that these defects can make the colours observable in a larger range of viewing angles. Further we address the influence of the processing parameters on the spectral profile of the reflected light.

scholarly journals Laser-induced microstructures on silicon for laser-driven acceleration experiments

2017 ◽  
Vol 5 ◽  
Author(s):  
Tina Ebert ◽  
Nico W. Neumann ◽  
Torsten Abel ◽  
Gabriel Schaumann ◽  
Markus Roth
Keyword(s):  
Repetition Rate ◽  
Laser Pulses ◽  
High Repetition Rate ◽  
Ultrashort Laser Pulses ◽  
Surface Structures ◽  
Ambient Media ◽  
High Repetition ◽  
Wafer Thickness ◽  
Structure Height ◽  
Ultrashort Laser

Ultrashort laser pulses are used to create surface structures on thin ($25~\unicode[STIX]{x03BC}\text{m}$) silicon (Si) wafers. Scanning the wafer with a galvanometric mirror system creates large homogeneously structured areas. The variety of structure shapes that can be generated with this method is exemplified by the analysis of shape, height and distance of structures created in the ambient media air and isopropanol. A study of the correlation between structure height and remaining wafer thickness is presented. The comparatively easy manufacturing technique and the structure variety that allows for custom-tailored targets show great potential for high repetition rate ion acceleration experiments.

scholarly journals Superficial changes on the Inconel 600 superalloy by picosecond Nd:YAG laser operating at 1064, 532, and 266 nm: Comparative study

2012 ◽  
Vol 30 (2) ◽  
pp. 249-257 ◽  
Author(s):  
J. Stašić ◽  
B. Gaković ◽  
M. Trtica ◽  
T. Desai ◽  
L. Volpe
Keyword(s):  
Comparative Study ◽  
Nd:Yag Laser ◽  
Surface Damage ◽  
Laser Pulses ◽  
Laser Wavelength ◽  
Ultrashort Laser Pulses ◽  
Periodic Surface ◽  
Inconel 600 ◽  
Hydrodynamic Effects ◽  
Ultrashort Laser

AbstractA comparative study of superficial changes on the superalloy Inconel 600, induced by a picosecond Nd:YAG laser operating at 1064, 532, and 266 nm, is presented. All of the laser wavelengths, as well as the used fluences of 2.5 (1064 nm), 4.3 (532 nm), and 0.6 J/cm2 (266 nm) were found to be adequate for inducing surface variations. Quite different surface features were produced depending on the laser wavelength used. The measured surface damage thresholds were 0.25, 0.13 and 0.10 J/cm2 for 1064, 532, and 266 nm, respectively. Drastic differences, in function of the wavelength used, were recorded for the crater depths, as well the appearance of hydrodynamic effects and periodic surface structures. Differences in crater depths were explained via an easier propagation of the first harmonic laser radiation (1064 nm) through the ejected material and plasma compared to a radiation at 532 and 266 nm. Finally, changes in the surface oxygen content caused by ultrashort laser pulses were considered.

Controlled Fabrication of Micro/Nano-Structures on Germanium Using Ultrashort Laser Pulses under Ambient Conditions

2016 ◽  
Vol 1136 ◽  
pp. 440-445 ◽  
Author(s):  
Manickam Sivakumar ◽  
Jun Wang
Keyword(s):  
Laser Pulses ◽  
Sample Surface ◽  
Ultrashort Laser Pulses ◽  
Movement Direction ◽  
Beam Polarization ◽  
Ambient Conditions ◽  
Periodic Surface ◽  
Melting Threshold ◽  
A Minor ◽  
Ultrashort Laser

A technique for ordered fabrication of periodic freestanding micro/nanostructures on the crystalline germanium (Ge) <100> surfaces with 1064 nm wavelength ultrashort laser pulses under ambient conditions is presented. The laser radiation fluence used for obtaining the structures is close to the melting threshold (0.1 J/cm2) of Ge. The dimensions of structures range from hundreds of nanometres to a few microns. The orientation of the periodic surface structures depends on laser beam polarization direction. Arrays of structures are formed in rows parallel to the sample movement direction for samples machined with s-polarized laser pulses, but formed in the direction perpendicular to the movement for p-polarized pulses. The structures are fabricated under variable temperatures on sample surface owing to the changed interference between incident and reflected laser beams. A micro-Raman analysis of the processed surfaces shows a minor change in the spectral intensity as compared to the unprocessed surface and the material retains its crystallinity after laser irradiation.

Welding characteristics of foturan glass using ultrashort laser pulses

2012 ◽  
Author(s):  
Isamu Miyamoto ◽  
Kristian Cvecek ◽  
Yasuhiro Okamoto ◽  
Michael Schmidt ◽  
Henry Helvajian
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Ultrashort Laser

Evaluation of Chip-Breakers Manufactured by Ultrashort Laser Pulses in Cemented Carbide Tools

2017 ◽  
Author(s):  
Marcelo Bertolete Carneiro ◽  
Patrícia Alves Barbosa ◽  
Ricardo Samad ◽  
NIlson Vieira ◽  
Wagner de Rossi ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Cemented Carbide ◽  
Cemented Carbide Tools ◽  
Ultrashort Laser

Picosecond Single-Photon and Femtosecond Two-Photon Pulsed Laser Stimulation for IC Characterization and Failure Analysis

2009 ◽  
Author(s):  
V. Pouget ◽  
E. Faraud ◽  
K. Shao ◽  
S. Jonathas ◽  
D. Horain ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Photon ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Laser Stimulation ◽  
Two Photon ◽  
Resolution Improvement ◽  
Ultrashort Laser

Abstract This paper presents the use of pulsed laser stimulation with picosecond and femtosecond laser pulses. We first discuss the resolution improvement that can be expected when using ultrashort laser pulses. Two case studies are then presented to illustrate the possibilities of the pulsed laser photoelectric stimulation in picosecond single-photon and femtosecond two-photon modes.

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