Silicon Plasma Heating in Air under Combined Bichromatic Laser Radiation at Wavelengths of 355 and 532 nm

2022 ◽  
Author(s):  
A. N. Chumakov ◽  
V. V. Lychkoskyi
Keyword(s):  
Laser Radiation ◽  
Plasma Heating ◽  
532 Nm

SILICON PLASMA HEATING IN AIR AT THE COMBINED BICHROMATIC LASER RADIATION AT WAVELENGTHS OF 355 and 532 nm

2021 ◽  
Vol 88 (6) ◽  
pp. 900-906
Author(s):  
A. N. Chumakov ◽  
V. V. Lychkoskyi
Keyword(s):  
Laser Radiation ◽  
Radiation Power ◽  
Plasma Heating ◽  
Pulsed Laser ◽  
Ambient Air ◽  
Radiation Power Density ◽  
Pulsed Laser Radiation ◽  
Nanosecond Pulses ◽  
Ablation Plasma ◽  
532 Nm

The formation and heating of laser plasma under the irradiation of silicon in ambient air by pulsed laser radiation with wavelengths of 355 and 532 nm at radiation power density up to 5 GW/cm2 has been experimentally investigated. An increased efficiency of the formation and heating of ablation plasma under bichromatic irradiation of silicon with advanced action of nanosecond pulses with a wavelength of 355 nm has been established.

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.

Characterization of the palladium plasma produced by nanosecond pulsed 532 nm and 1064 nm wavelength lasers

Laser Physics ◽  
2021 ◽  
Vol 32 (2) ◽  
pp. 026002
Author(s):  
M Asif ◽  
U Amin ◽  
Z U Rehman ◽  
R Ali ◽  
H Qayyum
Keyword(s):  
Kinetic Energy ◽  
Electron Temperature ◽  
Electron Density ◽  
Laser Plasma ◽  
Laser Fluence ◽  
Plasma Heating ◽  
Total Charge ◽  
Plasma Parameters ◽  
Wide Range ◽  
532 Nm

Abstract Palladium plasma produced by nanosecond pulsed 532 nm and 1064 nm wavelengths lasers is studied with the help of planer Langmuir probe. The experiment is conducted over a wide range of the laser fluence (1.6–40 J cm−2). The measured time of flight ions distributions are used to infer total charge, kinetic energy of the palladium ions and plasma parameters. Our results indicate that the ion charge produced by both laser wavelengths is an increasing function of the laser fluence. Initially, the ion charge produced by 1064 nm is lower than 532 nm, but it increases at much faster rate with the rise of laser fluence as the inverse bremsstrahlung plasma heating prevails at higher plasma densities. The most probable kinetic energy of the Pd ions produced by 1064 nm wavelength is also lower than that of 532 nm. The time varying plasma electron temperature and electron density are derived from the current–voltage plots of the two plasmas. For both wavelengths, the electron temperature and electron density rapidly climb to a maximum value and then gradually decline with time. However, in case of the 532 nm, the electron temperature and electron density remain consistently high throughout the laser plasma. The results are compared the available literature and discussed by considering surface reflectivity, ablation rate of the Pd target and laser plasma heating. The results presented in this work will provide more insight into the process of laser ablation and can be useful for the development of laser-plasma ion sources.

Attenuation and Transmission of Laser Radiation at 532 nm and 1064 nm through Rain

2011 ◽  
Vol 31 (1) ◽  
pp. 0101004
Author(s):  
郭婧 Guo Jing ◽  
张合 Zhang He ◽  
王晓锋 Wang Xiaofeng
Keyword(s):  
Laser Radiation ◽  
532 Nm
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