Temat: self-focusing - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Enhanced resonant second harmonic generation in plasma based on density transition
Autorzy:: Kant, N.
Thakur, V.
Powiązania:: https://bibliotekanauki.pl/articles/148562.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: second harmonic generation
laser
plasma density ramp
self-focusing
Opis:: Resonant second harmonic generation of a relativistic self-focusing laser in plasma with density ramp profile has been investigated. A high intense Gaussian laser beam generates resonant second harmonic beam in plasma with density ramp profile. The second harmonic undergoes periodic focusing in the plasma channel created by the fundamental wave. The normalized second harmonic amplitude varies periodically with distance and attains maximum value in the focal region. Enhancement in the second harmonic amplitude on account of relativistic self-focusing of laser based on plasma density transition is seen. Plasma density ramp plays an important role to make self-focusing stronger which leads to enhance the second harmonic generation in plasma.
Źródło:: Nukleonika; 2015, 60, 2; 355-360
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Ponderomotive self-focusing of a short laser pulse under a plasma density ramp
Autorzy:: Kant, N.
Saralch, S.
Singh, H.
Powiązania:: https://bibliotekanauki.pl/articles/146636.pdf
Data publikacji:: 2011
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: self-focusing
underdense plasma
plasma density ramp
ponderomotive force
short laser pulse
Gaussian beam
Opis:: The ponderomotive self-focusing of a short laser pulse in an underdense plasma under a plasma density ramp is analyzed. The pulse may acquire a minimum spot size due to the ponderomotive self-focusing. Beyond the focus, the nonlinear refraction starts weakening, and the spot size of the laser pulse increases, resulting in an oscillatory self-focusing and defocusing behavior of the beam with the propagation distance. In order to minimize the defocusing, we introduce a localized upward plasma density ramp. Due to the upward plasma density ramp, the laser beam retains a minimum spot size. Self-focusing becomes stronger with a mild ripple as the propagation distance increases. The conditions for the ponderomotive self-focusing for suitable parameters of the laser beam and the plasma are determined. The plasma density ramp of the considered type may be observed in gas jet plasma experiments.
Źródło:: Nukleonika; 2011, 56, 2; 149-153
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

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