Characterization of Tin/Ethylene Glycol Solar Nanofluids Synthesized by Femtosecond Laser Radiation

ChemPhysChem ◽  
2016 ◽  
Vol 18 (9) ◽  
pp. 1055-1060 ◽  
Author(s):  
Rafael Torres-Mendieta ◽  
Rosa Mondragón ◽  
Verónica Puerto-Belda ◽  
Omel Mendoza-Yero ◽  
Jesús Lancis ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Ethylene Glycol ◽  
Femtosecond Laser Radiation

Temperature and strain characterization of Bragg gratings impressed with femtosecond laser radiation in suspended-silica-core fibers

2009 ◽  
Author(s):  
Luís A. Fernandes ◽  
Martin Becker ◽  
Orlando Frazão ◽  
Manfred Rothhardt ◽  
Sven Brückner ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Bragg Gratings ◽  
Femtosecond Laser Radiation ◽  
Strain Characterization ◽  
Silica Core

scholarly journals SEM characterization of two-dimensional patterns generated in titanium by femtosecond laser interferometry

2013 ◽  
Vol 19 (S4) ◽  
pp. 143-144
Author(s):  
V. Oliveira ◽  
N.I. Polushkin ◽  
O. Conde ◽  
R. Vilar
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Two Dimensional ◽  
Femtosecond Laser Radiation ◽  
Scanning Velocity ◽  
One Dimensional ◽  
Scanning Electron

Laser ablation using ultrafast femtosecond lasers and holographic schemes has proven to be a powerful and versatile tool for surface and volume structuring. The principle of operation of this technique is simple: when two or more pulses overlap in time and space, an interference pattern is generated that can be used to create periodic surface structures. In addition, due to the extremely short pulse duration, a very high peak power is achieved leading to intense non-linear effects. As a result, almost any type of material can be processed without undesirable collateral thermal effects.In this paper, characterization of two-dimensional (2D) patterns generated in titanium using femtosecond laser radiation has been carried out using scanning electron microscopy (SEM). The laser source is a commercial Yb:KYW laser system providing pulses with a duration of 560 fs at a central wavelength of >= 1030 nm. The surface topography was characterized using a Hitachi S2400 scanning electron microscope operated at an electron acceleration voltage of 25.0 kV. Laser processing was performed in air on polished grade 2 titanium samples, a material typically used in low load bearing medical devices.One-dimensional (1D) gratings were created using a modified Michelson interferometer described in detail elsewhere (Oliveira et al., 2012). To create 2D gratings a double exposure method was used. First, 1D gratings were produced in linear tracks by translating the sample relatively to the stationary interfering laser beams with a fixed scanning velocity of 0.1 mm/s. As an example, Figure 1 depicts SEM pictures of horizontal and vertical 1D gratings with period of about 3.9 m, generated using a pulse energy and pulse repetition rate of 0.35 mJ and 100 Hz, respectively. The peak to valley distance of these patterns can be controlled either by changing the scanning velocity or the pulse repetition rate. By overlapping two linear tracks, different kinds of 2D structures can be created. Figure 2 depicts a square pattern obtained by overlapping two 1D gratings rotated by 90°. The dimensions of the squares depend on the one-dimensional gratings period, which in turn can be easily controlled by varying the distance between the interfering beams. Figure 3 depicts two other possibilities: i) trapezium-like patterns obtained by rotating the 1D gratings by 45°, and ii) rectangular patterns obtained using 1D gratings with different periods and rotated by 90°.The proposed optical setup offers a simple method of texturing the surface of materials and, hence, to control surface properties such as wettability. In the case of titanium, this is particularly important because surface texturing enhances its osseointegration ability. For this purpose, when compared with the columns spontaneously formed on titanium surfaces treated with femtosecond laser radiation, these 2D gratings present the major advantage of being size and shape-controllable.

scholarly journals Synthesis and characterization of gold/water nanofluids suitable for thermal applications produced by femtosecond laser radiation

2016 ◽  
Vol 6 (3) ◽  
pp. 034001 ◽  
Author(s):  
Rosa Mondragón ◽  
Rafael Torres-Mendieta ◽  
Marco Meucci ◽  
Gladys Mínguez-Vega ◽  
J. Enrique Juliá ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Synthesis And Characterization ◽  
Femtosecond Laser Radiation

Nonlinear optical diagnostics of local crystallization of lead zirconate titanate films using femtosecond laser radiation

2015 ◽  
Vol 41 (5) ◽  
pp. 418-421 ◽  
Author(s):  
A. S. Elshin ◽  
N. Yu. Firsova ◽  
M. A. Marchenkova ◽  
V. I. Emel’yanov ◽  
I. P. Pronin ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Lead Zirconate Titanate ◽  
Nonlinear Optical ◽  
Optical Diagnostics ◽  
Lead Zirconate ◽  
Femtosecond Laser Radiation ◽  
Zirconate Titanate

scholarly journals The accumulation of femtosecond laser radiation energy in crystals of lithium fluoride

2015 ◽  
Author(s):  
V. P. Dresvyanskiy ◽  
D. S. Glazunov ◽  
S. V. Alekseev ◽  
V. F. Losev ◽  
B. Chadraa ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Lithium Fluoride ◽  
Radiation Energy ◽  
Femtosecond Laser Radiation ◽  
Laser Radiation Energy

scholarly journals Laser-Induced Streams in Liquids Depending on Focusing Conditions of Pulse-Periodic Femtosecond Laser Radiation

2019 ◽  
Vol 20 (3) ◽  
pp. 1-17
Author(s):  
S.Yu. Lavrentyev ◽  
◽  
N.G. Solovyov ◽  
A.N. Shemyakin ◽  
M.Yu. Yakimov ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Radiation

scholarly journals Nonlinear absorption of intense femtosecond laser radiation in air

2006 ◽  
Vol 14 (17) ◽  
pp. 7552 ◽  
Author(s):  
D. V. Kartashov ◽  
A. V. Kirsanov ◽  
A. M. Kiselev ◽  
A. N. Stepanov ◽  
N. N. Bochkarev ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Nonlinear Absorption ◽  
Femtosecond Laser Radiation
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