scholarly journals Low and high repetition frequency femtosecond lasers processing of tungsten-based thin film

2014 ◽  
Vol 32 (4) ◽  
pp. 613-619
Author(s):  
B. Gaković ◽  
S. Petrović ◽  
A. Krmpot ◽  
D. Pantelić ◽  
B. Jelenković ◽  
...  
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Femtosecond Lasers ◽  
Surface Structures ◽  
Repetition Frequency ◽  
Nano Particles ◽  
Laser Polarization ◽  
Thin Film Thickness ◽  
High Repetition ◽  
Linearly Polarized

AbstractIn this work we reported low and high repetition frequency femtosecond laser-induced modifications of tungsten-based thin film. The tungsten-titanium (WTi) thin film, thickness of 190 nm, was deposited by sputtering on single crystal Si (100) wafer. Irradiations were performed in air by linearly polarized and focused femtosecond laser beams with following parameters: (1) pulse duration 160 fs, wavelength 800 nm, laser repetition frequency (LRF) 75 MHz — high LRF, and (2) duration 40 fs, wavelength 800 nm, LRF of 1 kHz — low LRF. The results of femtosecond lasers processing of the WTi thin film revealed laser induced periodical surface structures (LIPSS) in the case of low LRF regime. LIPSSs were formed with different periodicity and different orientation to the laser polarization at the surface: micro-scale LIPSSs with orientation perpendicular to the laser polarization and nano-scale LIPSSs parallel and perpendicular to the laser polarization. After processing of the WTi/Si system in high LRF regime ablation and nano-particles formation were registered.

High-speed processing of silicon carbide ceramic by high repetition frequency femtosecond laser

2021 ◽  
Author(s):  
Jian Zhang ◽  
Feng Geng ◽  
Zhichao Liu ◽  
Qinghua Zhang ◽  
Qiao Xu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Femtosecond Laser ◽  
High Speed ◽  
Repetition Frequency ◽  
Silicon Carbide Ceramic ◽  
High Repetition

scholarly journals Titanium surface modification using femtosecond laser with 1013–1015 W/cm2 intensity in vacuum

2012 ◽  
Vol 31 (1) ◽  
pp. 29-36 ◽  
Author(s):  
M. Trtica ◽  
D. Batani ◽  
R. Redaelli ◽  
J. Limpouch ◽  
V. Kmetik ◽  
...  
Keyword(s):  
Surface Modification ◽  
Femtosecond Laser ◽  
Titanium Surface ◽  
Femtosecond Lasers ◽  
Single Pulse ◽  
Surface Structures ◽  
Pulse Regime ◽  
Periodic Surface ◽  
Reduced Intensity ◽  
Surface Changes

AbstractThe response of titanium surface irradiated with high intensity (1013 – 1015 W/cm2) Ti:sapphire laser was studied in vacuum. Most of the reported investigations were conducted with nano- to femtosecond lasers in gas atmospheres while the studies of titanium surface interacting with femtosecond laser in vacuum are scarce. The laser employed in our experiment was operating at 800 nm wavelength and pulse duration of 60 fs in single pulse regime. The observed surface changes and phenomena are (1) creation of craters, (2) formation of periodic surface structures at the reduced intensity, and (3) occurrence of plasma in front the target. Since microstructuring of titanium is very interesting in many areas (industry, medicine), it can be concluded from this study that the reported laser intensities can effectively be applied for micromachining of the titanium surface (increasing the roughness, formation of parallel periodic surface structures etc.).

Fast formation of hybrid periodic surface structures on Hf thin-film by focused femtosecond laser beam

2019 ◽  
Author(s):  
Alexandr V. Dostovalov ◽  
Kirill A. Bronnikov ◽  
Dmitrii A. Belousov ◽  
Victor P. Korolkov ◽  
Sergey A. Babin
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Laser Beam ◽  
Surface Structures ◽  
Periodic Surface ◽  
Femtosecond Laser Beam

scholarly journals Investigations on the oxidation phenomenon of SiC/SiC fabricated by high repetition frequency femtosecond laser

2020 ◽  
Vol 502 ◽  
pp. 144131 ◽  
Author(s):  
Zhaoyang Zhai ◽  
Chen Wei ◽  
Yanchao Zhang ◽  
Yahui Cui ◽  
Quanren Zeng
Keyword(s):  
Femtosecond Laser ◽  
Repetition Frequency ◽  
High Repetition

Welding of Fused Silica by Using High Repetition Frequency Femtosecond Laser

2018 ◽  
Vol 45 (7) ◽  
pp. 0701007
Author(s):  
丁腾 Ding Teng ◽  
王雪辉 Wang Xuehui ◽  
王关德 Wang Guande ◽  
钱静 Qian Jing ◽  
王何宁 Wang Hening ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fused Silica ◽  
Repetition Frequency ◽  
High Repetition

Chromium thin film ablation with double pulse of femtosecond laser

2004 ◽  
Author(s):  
Etsuji Ohmura ◽  
Tomohiro Okamoto ◽  
Seiji Fujiwara ◽  
Tomokazu Sano ◽  
Isamu Miyamoto
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Double Pulse

Stoichiometric composition of thin-film surface structures and its influence on the functional characteristics as regards gyroscopic devices

2020 ◽  
pp. 78-90
Author(s):  
M. A. Tit ◽  
S. N. Belyaev
Keyword(s):  
Thin Film ◽  
Titanium Nitride ◽  
Niobium Carbide ◽  
Structural Phase ◽  
Stoichiometric Composition ◽  
Film Surface ◽  
Surface Structures ◽  
Functional Surface ◽  
Base Surface ◽  
Thin Film Surface

This article considers the research results of the effect of stoichiometry on the properties of titanium nitride thin-film coatings of the float and electrostatic gyroscopes. It presents the results of tests of such mechanical and optical characteristics of titanium nitride thin-film structures as microhardness, resistance to wear and friction, and image contrast determined by the reflection coefficients of a titanium nitride base surface and a raster pattern formed by local laser oxidation. When making a rotor of a cryogenic gyroscope, the prospects of use and technological methods for the formation of functional surface structures of niobium carbide and nitride are considered. It is shown that during the formation of coatings of the required composition, the most important is the thermodynamic estimation of possible interactions. These interactions allow us to accomplish the structural-phase modification of the material, which is determined by the complex of possible topochemical reactions leading to the formation of compounds, including non-stoichiometric composition.

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