scholarly journals Scattering of laser radiation from condensed phase of heterogeneous smoky plasma

2021 ◽  
pp. 147-155
Author(s):  
G.S. Dragan ◽  
V.I. Santonii ◽  
G.L. Shyngarov ◽  
O.A. Rimashevsky ◽  
K.V. Kolesnikov ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Condensed Phase ◽  
Spatial Structures ◽  
Laser Scattering ◽  
Scattering Indicatrix ◽  
Experimental Stand ◽  
Measurement Results ◽  
Experimental Complex ◽  
Processing Of Measurement Results ◽  
532 Nm

A technique for research the spatial structures of the condensed phase grains in heterogeneous smoky plasma by determining the laser scattering indicatrix modulated with a frequency of 60 kHz in three spectral intervals was developed. An experimental stand was created to register the laser scattering indicatrix on the wavelengths of 808 nm, 630 nm and 532 nm in the scattering angles range from 0 to 170º with a measurement time of 3 seconds. A program of registration and processing of measurement results on a computer has been developed. Tests of the experimental complex on the flame of metalized fuel compositions were carried out.

Ultrastructural changes of the rabbits retina after threshold laser radiation with a wavelength of 532 nm, 577nm and 810 nm

2014 ◽  
Vol 52 (6) ◽  
pp. 89-94
Author(s):  
N. Dumbrova ◽  
◽  
N. Molchanyuk ◽  
T. Romanova ◽  
N. Gavronskaya ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Ultrastructural Changes ◽  
532 Nm

Laser-Induced Size and Shape Transformation of Silver Colloidal Nanoparticles

2005 ◽  
Vol 106 ◽  
pp. 27-30 ◽  
Author(s):  
Nikolai Tarasenko ◽  
Andrei Butsen ◽  
Gvidona Shevchenko ◽  
Ilona Yakutik
Keyword(s):  
Silver Nanoparticles ◽  
Laser Radiation ◽  
Pulsed Laser ◽  
Colloidal Nanoparticles ◽  
Shape Transformation ◽  
Experimental Conditions ◽  
Pulsed Laser Radiation ◽  
Agno3 Solution ◽  
Silver Colloidal Nanoparticles ◽  
532 Nm

In this paper studies of the changes of the morphology of silver colloidal nanoparticles under laser irradiation at different fluences and wavelengths have been presented. Silver nanoparticles of size 10-30 nm were prepared in a gelatin stabilized AgNO3 solution under reduction with K-Na-tartrate. They were then exposed to pulsed laser radiation at 532 nm, 400 nm and 266 nm. In addition to the fragmented particles, relatively larger-size (1400-1500 nm) rightangled structures were found to be formed in the solution. The experimental conditions favouring laser-induced transformation of the morphology of nanoparticles have been determined.

The Feature of Laser Deposition of Polymeric Composite Films from an Active Gas Phase

2011 ◽  
Vol 480-481 ◽  
pp. 30-35 ◽  
Author(s):  
Zhu Bo Liu ◽  
Xiao Hong Jiang ◽  
Bing Zhou ◽  
M.A. Yarmolenko ◽  
D.L. Gorbachev ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
Composite Films ◽  
Polymeric Composite ◽  
Laser Wavelength ◽  
Attenuated Total Reflection ◽  
Silicon Films ◽  
Organic Silicon ◽  
Order Degree ◽  
532 Nm

The organic-silicon films, polytetrafluorethylene (PTFE) films and its composite films with copper have been fabricated from an active gas phase by pulse laser dispersion from initial powder species. The features of all films obtained were studied with the application of attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. Our results suggest that the wavelength of laser radiation impact a strong effect on the molecular structure of all films. Specifically, the peaks corresponding to the detachment of C-H bonds in the organic-silicon films and its Cu doped films at a laser wavelength of 532 nm and the destruction of the Si-O-Si groups at 266 nm due to the ultraviolet radiation have been observed. Interestingly, the concentration of Si-С6Н5 groups relative increases with a decremental of the wavelength of laser radiation. In addition, the PTFE films formed at a laser wavelength of 355 nm presented a lower order degree and high amorphous phase, while PTFE-Cu composite films at laser wavelength 266 nm exhibited enhanced crystallinity due to the presence of copper species, wherein being served as nucleation centers. Remarkably, the wavelengths of laser radiation nearly play no effect on the orderness of PTFE-Cu composite films.

Thermally stable J-type phthalocyanine dimers as new non-linear absorbers for low-threshold optical limiters

2016 ◽  
Vol 18 (23) ◽  
pp. 15964-15971 ◽  
Author(s):  
Alexander Yu. Tolbin ◽  
Mikhail S. Savelyev ◽  
Alexander Yu. Gerasimenko ◽  
Larisa G. Tomilova ◽  
Nikolay S. Zefirov
Keyword(s):  
Laser Radiation ◽  
Thermally Stable ◽  
Optical Limiters ◽  
Dimeric Complexes ◽  
Non Linear ◽  
Low Threshold ◽  
532 Nm

The possibility of developing new advanced optical limiters of laser radiation at 532 nm with low limiting thresholds has been demonstrated on thermally stable phthalocyanine J-type dimeric complexes of Mg, Zn, Cu, Ni, and Co.

Effects of Nd:YAG (532 nm) laser radiation on ‘clean’ cotton

2004 ◽  
Vol 79 (2) ◽  
pp. 331-333 ◽  
Author(s):  
F. Bloisi ◽  
L. Vicari ◽  
A.C. Barone ◽  
E. Martuscelli ◽  
G. Gentile ◽  
...  
Keyword(s):  
Laser Radiation ◽  
532 Nm

scholarly journals Времяпролетные характеристики лазерного факела при абляции мишени MnSi в атмосфере аргона

2018 ◽  
Vol 44 (6) ◽  
pp. 103
Author(s):  
О.А. Новодворский ◽  
В.А. Михалевский ◽  
Д.С. Гусев ◽  
А.А. Лотин ◽  
Л.С. Паршина ◽  
...  
Keyword(s):  
Distribution Function ◽  
Laser Radiation ◽  
Langmuir Probe ◽  
Velocity Distribution Function ◽  
Argon Atmosphere ◽  
Gas Pressure ◽  
Buffer Gas ◽  
Laser Torch ◽  
Ion Velocity Distribution Function ◽  
532 Nm

AbstractThe Langmuir-probe technique has been used to study the time-of-flight characteristics of a laser torch during MnSi-target ablation in vacuum and argon atmosphere by pulsed 532-nm laser radiation at 15-ns pulse duration. It is established that the amplitude of the signal of fast particles in the laser torch nonmonotonically depends on the buffer-gas pressure. Mechanisms determining this dependence of laser-torch characteristics on the pressure are considered. The influence of buffer-gas pressure on the ion-velocity distribution function is determined.

scholarly journals Modern laser-technologies and nanotechnologies - next-generation on new physical principles

2021 ◽  
Vol 2131 (5) ◽  
pp. 052081
Author(s):  
S M Arakelian ◽  
G A Evstyunin ◽  
A V Zdanov ◽  
S I Abrakhin
Keyword(s):  
Laser Radiation ◽  
Elemental Composition ◽  
Solid Surface ◽  
Material Science ◽  
Spatial Structures ◽  
Thermal Hardening ◽  
Current State ◽  
Laser Technologies ◽  
State Of Research ◽  
Physical Principles

Abstract In the paper we discuss new tendencies and trends in laser/nanotechnologies based on topological material-science with spatial structures of necessary types induced by laser radiation on solid surface. Review of the current state of research on this issue, main directions and scientific advantages are presented. In our study we used originally manufactured the multibeam laser-technological automated complex for thermal hardening of the surface of different products with variable elemental composition. The database for several functional characteristics, varied under processing by laser radiation the surface of materials, is given.

scholarly journals Research of the probability of the "flip" of approximating function during the processing of measurement results

2019 ◽  
Vol 104 ◽  
pp. 02003
Author(s):  
Vladimir Marchuk ◽  
Dmitry Chernyshov ◽  
Ilya Sadrtdinov ◽  
Alexander Minaev
Keyword(s):  
Confidence Intervals ◽  
Additive Noise ◽  
A Priori ◽  
Rate Of Change ◽  
Statistical Characteristics ◽  
Sample Length ◽  
Signal Function ◽  
Measurement Results ◽  
Processing Of Measurement Results ◽  
A Priori Uncertainty

The paper presents the results of the studies of the probability of a “flip” of the approximating function when processing the measurement results under conditions of a priori uncertainty about the signal function and the statistical characteristics of additive noise. It is analytically proved that the confidence intervals of the probability of the absence and the presence of a “flip” are equal, which is confirmed by the experimental results. The dependences of the “flipping” of the approximating function on the sample length, the dispersion of additive noise and the rate of change of the function itself are obtained.

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