THz generation by the beating of two high intense laser beams

2013 ◽  
Vol 79 (5) ◽  
pp. 657-660 ◽  
Author(s):  
RABEA Q. NAFIL ◽  
MONIKA SINGH ◽  
A. H. AL-JANABI ◽  
R. P. SHARMA
Keyword(s):  
High Power ◽  
Intense Laser ◽  
Laser Beams ◽  
Thz Radiation ◽  
Electron Mass ◽  
Nonlinear Coupling ◽  
High Power Laser ◽  
Static Electric Field ◽  
Power Laser ◽  
Plasma Parameters

AbstractThe nonlinear coupling of two high-power laser beams in plasmas in the presence of a transverse, static electric field is investigated to generate a difference frequency terahertz (THz) radiation. The relativistic variation of electron mass in the presence of two high-power laser beams is responsible for producing a nonlinear current driving the THz radiation. For typical laser and plasma parameters, we report the efficiency of the order of ~10−4 for the current scheme.

scholarly journals Resonant excitation of the upper hybrid wave by relativistic cross focusing of two laser beams

2009 ◽  
Vol 27 (3) ◽  
pp. 429-437 ◽  
Author(s):  
Gunjan Purohit ◽  
Prashant Chauhan ◽  
R.P. Sharma
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
High Power ◽  
Resonant Excitation ◽  
Laser Beams ◽  
High Power Laser ◽  
Hybrid Wave ◽  
Power Laser ◽  
Plasma Parameters ◽  
Hybrid Frequency

AbstractThis article presents the resonant excitation of the upper hybrid wave (UHW) by cross focusing of two high power laser beams in a collisionless hot magnetoplasma; taking into account the relativistic nonlinearity. The electric vectors of the two beams are polarized along uniform static magnetic field and the beams propagate perpendicular to the static magnetic field. The resonant excitation of the UHW occurs when the frequency difference (FD) of the two laser beams and difference of their propagation vector satisfy the dispersion relation corresponding to the UHW. It has been observed that the power associated with the excited UHW, which depends on the background electron concentration, magnetic field and the intensity of the two laser beams, becomes drastically modified with the distance of propagation. The effect of the excited UHW at the FD on the acceleration of electrons has also been discussed. The amplitude of the UHW, excited by two high power laser beams and the electron energy are also calculated. This study is relevant in heating of plasma near the upper hybrid frequency as well as electron acceleration. The results are presented for typical laser plasma parameters.

Characterizing high-power laser beams to detect the thermal load of optics and to identify limitations within the design of the optical system

2009 ◽  
Author(s):  
Harald Schwede ◽  
Otto Märten ◽  
Reinhard Kramer ◽  
Stefan Wolf ◽  
Volker Brandl ◽  
...  
Keyword(s):  
Optical System ◽  
High Power ◽  
Thermal Load ◽  
Laser Beams ◽  
High Power Laser ◽  
Power Laser

Analysis of effects on the beam quality β factor of high power laser beams

2021 ◽  
Vol 14 (2) ◽  
pp. 1-8
Author(s):  
WANG Yan-ru ◽  
◽  
WANG Jian-zhong ◽  
RAN Zheng-hui ◽  
DING Yu-jie
Keyword(s):  
High Power ◽  
Beam Quality ◽  
Laser Beams ◽  
High Power Laser ◽  
Power Laser ◽  
I Factor

Improving near field of high-power laser beams

2011 ◽  
Vol 23 (4) ◽  
pp. 959-962
Author(s):  
谢娜 Xie Na ◽  
黄晚晴 Huang Wanqing ◽  
郭仪 Guo Yi ◽  
王晓东 Wang Xiaodong ◽  
方香云 Fang Xiangyun ◽  
...  
Keyword(s):  
High Power ◽  
Near Field ◽  
Laser Beams ◽  
High Power Laser ◽  
Power Laser

scholarly journals Interaction of high power laser beam with magnetized plasma and THz generation

2010 ◽  
Vol 28 (4) ◽  
pp. 531-537 ◽  
Author(s):  
R.P. Sharma ◽  
A. Monika ◽  
P. Sharma ◽  
P. Chauhan ◽  
A. Ji
Keyword(s):  
Magnetic Field ◽  
Laser Beam ◽  
High Power ◽  
Nonlinear Interaction ◽  
Difference Frequency ◽  
Thz Radiation ◽  
High Power Laser ◽  
Power Laser ◽  
Circularly Polarized ◽  
Paraxial Ray

AbstractThis paper presents an investigation of the excitation of a Tera hertz (THz) radiation by nonlinear interaction of a circularly polarized high power laser beam and density ripple in collisionless magneto plasma. The ponderomotive force due to the nonlinear interaction between the laser and density ripple generates a nonlinear current at a difference frequency. If the appropriate phase matching conditions are satisfied and the frequency of the ripple is appropriate, then this difference frequency can be brought in the THz range. Filamentation (self focusing) of a circularly polarized beam propagating along the direction of ambient magnetic field in plasma is first investigated within paraxial ray approximation. The beam gets focused when the initial power of the laser beam is greater than its critical power. Resulting localized beam couples with the pre-existing density ripple to produce a nonlinear current driving the THz radiation. Analytical expressions for the beam width of the laser beam, electric vector of the THz wave have been obtained. By changing the strength of the magnetic field, one can enhance or suppress the THz emission. For typical laser beam and plasma parameters with the incident laser power flux = 1014 W/cm2, laser beam radius (r0) = 40 µm, laser frequency (ω0) = 1014 rad/s and plasma density (n0) = 3 × 1018 cm−3, normalized ripple density amplitude (μ) = 0.3, the produced THz emission can be at the level of Giga watt in power.

M2-factor of high-power laser beams through a multi-apertured ABCD optical system

2020 ◽  
Vol 29 (6) ◽  
pp. 064206
Author(s):  
Xiangmei Zeng ◽  
Meizhi Zhang ◽  
Dongmei Cao ◽  
Dingyu Sun ◽  
Hua Zhou
Keyword(s):  
Optical System ◽  
High Power ◽  
Laser Beams ◽  
High Power Laser ◽  
Power Laser ◽  
Abcd Optical System
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