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 Fiber Bragg grating fabrication by femtosecond laser radiation

2019 ◽  
Vol 220 ◽  
pp. 03007
Author(s):  
Anton Chernikov ◽  
Dmitriy Kochuev ◽  
Kirill Khorkov ◽  
Ruslan Chkalov ◽  
Nikolay Davydov
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Fiber Optic Sensors ◽  
Bragg Grating ◽  
Femtosecond Laser Radiation ◽  
Grating Fabrication

The paper presents the results of fiber Bragg gratings fabrication by femtosecond laser radiation using point-by-point and line-by-line inscription methods. The approach makes it possible to fabricate the second and higher diffraction orders fiber Bragg gratings, which can be used as sensitive elements of fiber-optic sensors.

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.

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

scholarly journals Inscription of first-order sapphire Bragg gratings using 400 nm femtosecond laser radiation

2013 ◽  
Vol 21 (4) ◽  
pp. 4591 ◽  
Author(s):  
Tino Elsmann ◽  
Tobias Habisreuther ◽  
Albrecht Graf ◽  
Manfred Rothhardt ◽  
Hartmut Bartelt
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Bragg Gratings ◽  
Femtosecond Laser Radiation ◽  
First Order

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

Features of Femtosecond Micromachining of Solid Transparent Materials

2021 ◽  
Vol 316 ◽  
pp. 993-998
Author(s):  
Anton S. Chernikov ◽  
Ruslan V. Chkalov
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Spectral Characteristics ◽  
Fiber Bragg Gratings ◽  
Single Mode ◽  
Bragg Gratings ◽  
Femtosecond Laser Radiation ◽  
Third Order ◽  
Correction System

The paper reports the inscription of second- and third-order fiber Bragg gratings (FBGs) in single-mode optical fiber (SMF-28e+) via the line-by-line (LbL) and the point-by-point (PbP) methods using femtosecond laser radiation. The use of these methods jointly with based on an automatic spatial deviation correction system is considered. The approach allows to significantly improve spectral characteristics of FBG without the loss of fabrication performance.

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
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