Application of an Ultrashort-pulsed Laser for Generation of Super-hydrophobic Surfaces

Abstract Hydrophobic surfaces have gained a vast attention in different fields of biomedical applications over the last few years. Laser treatment has been shown as a promising technology for the generation of functional, inter alia, superhydrophobic surfaces. In this study a picosecond Yb-YAG laser was assigned for the generation of superhydrophobic characteristics on a steel alloy with application in surgical instrumentation. Regarding the ablation energy threshold of about 6 μJ for the given pulse width and laser beam characteristics and by assigning a suitable combination of microstructure kinematics and laser processing conditions a persistent hierarchical pattern is mapped over the laser-radiated surfaces. The average measured contact angle on the laserradiated surfaces was about 150°, which indicates their superhydrophobic properties.

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Modular Marx Generator Based on SiC-MOSFET Generating Adjustable Rectangular Pulses

Energies ◽

10.3390/en14123492 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3492

Author(s):

Yahia Achour ◽

Jacek Starzyński ◽

Jacek Rąbkowski

Keyword(s):

Silicon Carbide ◽

Repetition Rate ◽

Pulse Width ◽

Biomedical Applications ◽

Living Cells ◽

Marx Generator ◽

Electrical Field ◽

Rectangular Shape ◽

Overall Performance ◽

Pulsed Electrical Field

The paper introduces a new design of Marx generator based on modular stages using Silicon Carbide MOSFETs (SiC-MOSFET) aimed to be used in biomedical applications. In this process, living cells are treated with intense nanosecond Pulsed Electrical Field (nsPEF). The electric field dose should be controlled by adjusting the pulse parameters such as amplitude, repetition rate and pulse-width. For this purpose, the structure of the proposed generator enables negative pulses with a quasi-rectangular shape, controllable amplitude, pulse-width and repetition-rate. A complete simulation study was conducted in ANSYS-Simplorer to verify the overall performance. A compact, modular prototype of Marx generator was designed with 1.7 kV rated SiC-MOSFETs and, finally, a set of experiments confirmed all expected features.

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ANALYTICAL SOLUTIONS FOR THE VARIATIONAL EQUATIONS DERIVED FOR THE NONLINEAR SCHRÖDINGER EQUATION: DISPERSION-MANAGED FIBER SYSTEM

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863508004226 ◽

2008 ◽

Vol 17 (03) ◽

pp. 285-297 ◽

Cited By ~ 1

Author(s):

ABDOSLLAM M. ABOBAKER ◽

A. B. MOUBISSI ◽

TH. B. EKOGO ◽

K. NAKKEERAN

Keyword(s):

Schrödinger Equation ◽

Nonlinear Schrödinger Equation ◽

Pulse Width ◽

Schrodinger Equation ◽

Pulse Propagation ◽

Nonlinear Schrodinger Equation ◽

Fiber System ◽

Variational Equations ◽

Nonlinear Schrödinger ◽

The Given

We consider the nonlinear Schrödinger equation which governs the pulse propagation in dispersion-managed (DM) optical fiber transmission systems. Using a generalized form of ansatz function for the shape of the pulse, we derive the variational equations. For a particular case of DM fiber systems when the Hamiltonian is zero, we solve the variational equations analytically and obtain the expressions for the pulse energy, amplitude, width and chirp. Finally for Gaussian and hyperbolic secant shaped pulses, we show through numerical simulations that the analytically calculated energy (for the given pulse width and chirp) is good enough to support the periodic evolution of the DM soliton. The simulations are carried out for conventional and dense DM fiber systems for both lossless and lossy cases.

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Numerical simulation of different pulse width of long pulsed laser on aluminum alloy

10.1117/12.2182358 ◽

2015 ◽

Author(s):

Mingxin Li ◽

Guangyong Jin ◽

Wei Zhang ◽

Guibo Chen ◽

Juan Bi

Keyword(s):

Numerical Simulation ◽

Aluminum Alloy ◽

Pulse Width ◽

Pulsed Laser

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Synthesis of biomaterial thin films by pulsed laser technologies: Electrochemical evaluation of bioactive glass-based nanocomposite coatings for biomedical applications

Materials Science and Engineering C ◽

10.1016/j.msec.2012.03.001 ◽

2012 ◽

Vol 32 (5) ◽

pp. 1152-1157 ◽

Cited By ~ 22

Author(s):

L. Floroian ◽

M. Florescu ◽

F. Sima ◽

G. Popescu-Pelin ◽

C. Ristoscu ◽

...

Keyword(s):

Thin Films ◽

Bioactive Glass ◽

Biomedical Applications ◽

Pulsed Laser ◽

Nanocomposite Coatings ◽

Laser Technologies ◽

Electrochemical Evaluation

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Graphene slurry based passive Q-switcher in erbium doped fiber laser

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v8i4.1609 ◽

2019 ◽

Vol 8 (4) ◽

Author(s):

Siti Nur Fatin Zuikafly ◽

Nor Farhah Razak ◽

Rizuan Mohd Rosnan ◽

Sulaiman Wadi Harun ◽

Fauzan Ahmad

Keyword(s):

Pump Power ◽

Fiber Laser ◽

Pulse Width ◽

Peak Power ◽

Signal To Noise Ratio ◽

Pulsed Laser ◽

Laser Cavity ◽

Signal To Noise ◽

Maximum Pulse Energy ◽

Erbium Doped

In this work, a Graphene slurry based passive Q-switcher fabricated from Graphene-Polylactic acid (PLA) filament which is used for 3D printing. To produce the Graphene slurry, the diameter of the filament was reduced and Tetrahydrofuran (THF) was used to dissolve the PLA. The Graphene-THF suspension was drop cast to the end of a fiber ferrule and the THF then evaporated to develop Graphene slurry based SA which is integrated in fiber laser cavity. At threshold input pump power of 30.45 mW, a Q-switched Erbium-doped fiber laser (EDFL) can be observed with the wavelength centered at 1531.01 nm and this remained stable up to a pump power of 179.5 mW. As the pump power was increased gradually, an increase in the repetition rates was recorded from 42 kHz to 125 kHz, while the pulse width was reduced to 2.58 μs from 6.74 μs. The Q-switched laser yielded a maximum pulse energy and peak power of 11.68 nJ and 4.16 mW, respectively. The proposed Graphene slurry based saturable absorber also produced a signal-to-noise ratio of 44 dB indicating a stable Q-switched pulsed laser.

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A Low-Power and Wide-Range MEMS Capacitive Sensors Interface IC Using Pulse-Width Modulation for Biomedical Applications

IEEE Sensors Journal ◽

10.1109/jsen.2016.2587668 ◽

2016 ◽

Vol 16 (17) ◽

pp. 6745-6754 ◽

Cited By ~ 8

Author(s):

Md Shamsul Arefin ◽

Jean-Michel Redoute ◽

Mehmet Rasit Yuce

Keyword(s):

Low Power ◽

Pulse Width ◽

Biomedical Applications ◽

Pulse Width Modulation ◽

Capacitive Sensors ◽

Wide Range

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An 80 A, 2 to 25 ns Configurable Pulse-Width Integrated CMOS Pulsed Laser Driver with On-Chip Mounted Laser Diode

2020 IEEE International Symposium on Circuits and Systems (ISCAS) ◽

10.1109/iscas45731.2020.9181207 ◽

2020 ◽

Author(s):

Guillermo Blasco ◽

Dominik Dorich ◽

Eugeni Isern ◽

Ralf Burkard ◽

Elena Martin

Keyword(s):

Laser Diode ◽

Pulse Width ◽

Pulsed Laser ◽

Laser Driver ◽

On Chip

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Pulsed Laser Deposited Y3Fe5O12 Films for Magnetostatic Wave Band Pass Filters

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.152-153.377 ◽

2009 ◽

Vol 152-153 ◽

pp. 377-380

Author(s):

S.A. Manuilov ◽

Rickard Fors ◽

S.I. Khartsev ◽

A.M. Grishin

Keyword(s):

Surface Wave ◽

Insertion Loss ◽

Lattice Mismatch ◽

Uniaxial Anisotropy ◽

Pulsed Laser ◽

Wave Band ◽

Magnetostatic Wave ◽

Processing Conditions ◽

Band Pass ◽

Magnetostatic Surface Wave

Y3Fe5O12 (YIG) films were pulsed laser deposited onto the Gd3Ga5O12(111) substrates. Processing conditions were optimized to obtain films with a narrow ferromagnetic resonance (FMR) linewidth: 0.9 Oe in 1.22 μm thick YIG at 9 GHz. Due to sharp film-to-substrate interface YIG films remain strained hence possess unusually high lattice mismatch induced uniaxial anisotropy Hu = - 880 Oe. We fabricated and tested magnetostatic surface wave (MSSW) band pass hybrid-type filters with YIG film lain on transducers alumina board. MSSW filter with antennas areal size of 2 mm2 at 7.5 GHz shows insertion loss – 9 dB and a resonant 3 dB bandwidth as narrow as 12.5 MHz.

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