Photoacoustics of Gold Nanorods under Low Frequency Laser Pulses in Optical Hyperthermia

2014 ◽  
pp. 868-871
Author(s):  
C. Sánchez ◽  
J. A. Ramos ◽  
T. Fernández ◽  
F. del Pozo ◽  
J. J. Serrano
Keyword(s):  
Gold Nanorods ◽  
Low Frequency ◽  
Laser Pulses ◽  
Frequency Laser

Different regimes of strong-field dynamics of atoms in intense low-frequency laser pulses

2011 ◽  
Vol 58 (13) ◽  
pp. 1195-1205 ◽  
Author(s):  
A.M. Popov ◽  
O.V. Tikhonova ◽  
E.A. Volkova
Keyword(s):  
Strong Field ◽  
Low Frequency ◽  
Laser Pulses ◽  
Frequency Laser

Low-energy electron - argon scattering in a low-frequency laser field

1996 ◽  
Vol 29 (2) ◽  
pp. 345-364 ◽  
Author(s):  
C-T Chen ◽  
F Robicheaux
Keyword(s):  
Laser Field ◽  
Low Frequency ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron ◽  
Frequency Laser

The influence of low-frequency laser emission on phyto- and zooplankton productivity properties

2020 ◽  
Vol 12 (2) ◽  
pp. 196-201
Author(s):  
Lidiia Khuda ◽  
Larysa Cheban ◽  
Oleksii Khudyi
Keyword(s):  
Population Density ◽  
Catalase Activity ◽  
Laser Emission ◽  
Low Frequency ◽  
Positive Influence ◽  
The Other ◽  
Control Group ◽  
Microalgae Biomass ◽  
Frequency Laser ◽  
Positive Effect

We studied the possibility of using low frequency laser emission to improve production properties of feed hydrobionts, in particular microalgae Desmodesmus armatus and Daphnia magna, which are highly applied in aquaculture. It was shown that low-frequency laser emission with the wavelength 650 nm has a positive influence on production properties of both phyto- and zooplankton. In 24 hours the biomass of irradiated D. armatus was 25% larger than non-irradiated one. Meanwhile, application λ 420 and 530 nm did not show credible accumulation of microalgae biomass. If it comes to daphnia, positive dynamic in population density enlarging was observed only since 5-7th day of cultivation, depending on emission exposition. Differences in low-frequency laser emission with λ 420 and 530 efficacy on D. magna production properties were observed while using different exposition. Thus, maximal culture density was observed when λ 420 nm for 90 s and λ 650 nm for 60 s were applied. Longer irradiation with red laser did not have positive effect. It was established that in daphnia tissues, which were influenced by λ 420 nm laser emission, TBA-active products were accumulating more. Meanwhile, for daphnias, which were irradiated with red laser, TBA amount was not different from the control group one. Catalase activity increased while applying λ 650 nm laser emission. On the other hand, λ 420 nm did not cause credible increasing of catalase activity in comparison with control group. Taking received results about photobiological effects of low-frequency laser emission on D. armatus and D. magna into consideration, both biomasses enlargement during co-cultivation can be obtained if wavelength 650 nm is used.

THEORY OF BARRIER-SUPPRESSION IONIZATION OF ATOMS

1995 ◽  
Vol 04 (04) ◽  
pp. 775-798 ◽  
Author(s):  
V. P. KRAINOV
Keyword(s):  
Laser Field ◽  
Multiphoton Ionization ◽  
Low Frequency ◽  
Ionization Probability ◽  
Theoretical Description ◽  
Tunneling Ionization ◽  
Theoretical Approaches ◽  
Frequency Laser ◽  
Energy And Angular Distributions ◽  
Analytical Expressions

The theoretical description of the ionization of an atom (ion) by external electromagnetic radiation up to now concerned two alternative situations; multiphoton ionization and tunneling ionization. For both cases the formulas describing the ionization probability when the intensity of the laser field is not too strong are well known. However, if the field is strong, then there exists a new channel; the so-called barrier-suppression (or above-barrier) ionization of the atom. How does this process occur? It is obvious that barrier-suppression ionization and sub-barrier tunneling ionization by low-frequency laser field transform smoothly into one another as the field strength F is varied near the value of the barrier-suppression field F BSI . This paper contains a review of various theoretical approaches developed during the last few years, especially analytical considerations. Some new semi-analytical expressions for ionization rates, energy and angular distributions of ejected electrons are also derived.

Quasi-simultaneous double ionization of helium in super-intense high-frequency laser pulses

2003 ◽  
Vol 62 (5) ◽  
pp. 691-697 ◽  
Author(s):  
A Staudt ◽  
J Prager ◽  
C. H Keitel
Keyword(s):  
High Frequency ◽  
Laser Pulses ◽  
Double Ionization ◽  
Frequency Laser

Theory of high-harmonic generation by low-frequency laser fields

1994 ◽  
Vol 49 (3) ◽  
pp. 2117-2132 ◽  
Author(s):  
M. Lewenstein ◽  
Ph. Balcou ◽  
M. Yu. Ivanov ◽  
Anne L’Huillier ◽  
P. B. Corkum
Keyword(s):  
Harmonic Generation ◽  
High Harmonic ◽  
Low Frequency ◽  
High Harmonic Generation ◽  
Laser Fields ◽  
Frequency Laser

scholarly journals Nondrifting relativistic electromagnetic solitons in plasmas

2003 ◽  
Vol 21 (4) ◽  
pp. 541-544 ◽  
Author(s):  
M. LONTANO ◽  
M. BORGHESI ◽  
S.V. BULANOV ◽  
T.Z. ESIRKEPOV ◽  
D. FARINA ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Low Frequency ◽  
Laser Pulses ◽  
Particle In Cell ◽  
High Intensity Laser ◽  
Theoretical Investigations ◽  
Plasma Response ◽  
Warm Plasma ◽  
Electromagnetic Solitons

Low-frequency, relativistic, subcycle solitary waves are found in two-dimensional and three-dimensional particle-in-cell (PIC) numerical simulations, as a result of the interaction of ultrashort, high-intensity laser pulses with plasmas. Moreover, nondrifting, subcycle relativistic electromagnetic solitons have been obtained as solutions of the hydrodynamic equations for an electron–ion warm plasma, by assuming the quasi-neutrality character of the plasma response. In addition, the formation of long-living macroscopic soliton-like structures has been experimentally observed by means of the proton imaging diagnostics. Several common features result from these investigations, as, for example, the quasi-neutral plasma response to the soliton radiation, in the long-term evolution of the system, which leads to the almost complete expulsion of the plasma from the region where the electromagnetic radiation is concentrated, even at subrelativistic field intensity. The results of the theoretical investigations are reviewed with special attention to these similarities.

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