THE EFFECT OF LASER BEAM
INTENSITY ON SELF-FOCUSING AND
TERAHERTZ RADIATION AT LOW
FREQUENCY RANGE (0.1 AND 0.5) THZ
الباحث الأول:
منذر باقر حسن
الباحثين الآخرين:
محمد ضياء شريف
المجلة:
American Journal of Research
تاريخ النشر:
None
مختصر البحث:
Abstract
This research presents a study to explain the nonlinear self-focusing of
Gaussian laser beam with right circular polarization (RCP) in the presence of
longitudinal magnetic field, then propagation in plasma. Due to self-focusing
of (…
Abstract
This research presents a study to explain the nonlinear self-focusing of
Gaussian laser beam with right circular polarization (RCP) in the presence of
longitudinal magnetic field, then propagation in plasma. Due to self-focusing
of (RCP) laser beam inside plasma, the intensity inside the system will reach
1018 W.cm-2 or more which is enough to excite a terahertz radiation by
relativistic nonlinearity. The terahertz radiation generation is depending on
the down conversion of three wave mixing technique and on the fulfilling the
phase matching conditions between pump waves (laser beam), plasma wave
and generated terahertz wave. By designing appropriate Matlab programs, the
final equations of self-focusing effect and terahertz generation have been
solved numerically. The calculations show that the increasing of both the initial
intensity and the initial radius of the laser beam are leading to increase the
nonlinear self-focusing and thus the terahertz radiation generation. One of the
