Terahertz radiation generation by pulse slippage of Cosh-Gaussian lasers in a corrugated magnetized plasma

2017 ◽  
Vol 24 (12) ◽  
pp. 123117 ◽  
Author(s):  
Kusum Lata Mann ◽  
Vivek Sajal ◽  
Prateek Varshney ◽  
Navneet K. Sharma
Keyword(s):  
Terahertz Radiation ◽  
Magnetized Plasma ◽  
Radiation Generation

Tunable and efficient terahertz radiation generation by photomixing of two super Gaussian laser pulses in a corrugated magnetized plasma

2015 ◽  
Vol 117 (19) ◽  
pp. 193303 ◽  
Author(s):  
Prateek Varshney ◽  
Vivek Sajal ◽  
Kunwar Pal Singh ◽  
Ravindra Kumar ◽  
Navneet K. Sharma
Keyword(s):  
Terahertz Radiation ◽  
Laser Pulses ◽  
Magnetized Plasma ◽  
Radiation Generation

scholarly journals Strong terahertz radiation generation by beating of extra-ordinary mode lasers in a rippled density magnetized plasma

2013 ◽  
Vol 31 (2) ◽  
pp. 337-344 ◽  
Author(s):  
Prateek Varshney ◽  
Vivek Sajal ◽  
K.P. Singh ◽  
Ravindra Kumar ◽  
Navneet K. Sharma
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Terahertz Radiation ◽  
Magnetized Plasma ◽  
Wave Number ◽  
Thz Radiation ◽  
Present Scheme ◽  
Oscillatory Velocity ◽  
Radiation Generation ◽  
Ripple Amplitude

AbstractA scheme of terahertz radiation generation is proposed by beating of two extra-ordinary lasers having frequencies and wave numbers$\lpar {\rm \omega}_1\comma \; \vec k_1 \rpar $and$\lpar {\rm \omega}_2\comma \; \vec k_2 \rpar $, respectively in a magnetized plasma. Terahertz wave is resonantly excited at frequency$\lpar {\rm \omega}_1 - {\rm \omega}_2 \rpar $and wave number (k1 − k2 + q) with a wave number mismatch factorqwhich is introduced by the periodicity of plasma density ripples. In this process, the lasers exert a beat ponderomotive force on plasma electrons and impart them an oscillatory velocity with both transverse and longitudinal components in the presence of transverse static magnetic field. The oscillatory velocity couples with density ripples and produces a nonlinear current that resonantly excites the terahertz radiation. Effects of periodicity of density ripples and applied magnetic field are analyzed for strong THz radiation generation. The terahertz radiation generation efficiency is found to be directly proportional to the square of density ripple amplitude and rises with the magnetic field strength. With the optimization of these parameters, the efficiency ~10−3is achieved in the present scheme. The frequency and power of generated THz radiation can be better tuned with the help of parameters like density ripple amplitude, periodicity and applied magnetic field strength in the present scheme.

scholarly journals Strong terahertz radiation generation by beating of two x-mode spatial triangular lasers in magnetized plasma

2014 ◽  
Vol 33 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Prateek Varshney ◽  
Vivek Sajal ◽  
Sweta Baliyan ◽  
Navneet K. Sharma ◽  
Prashant K. Chauhan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Terahertz Radiation ◽  
Beam Width ◽  
Laser Pulses ◽  
Magnetized Plasma ◽  
Thz Radiation ◽  
Dc Magnetic Field ◽  
Radiation Generation ◽  
Transverse And Longitudinal Components ◽  
Frequency Laser

AbstractResonant THz radiation generation is proposed by beating of two spatial-triangular laser pulses of different frequencies (ω1, ω2) and wave numbers $\lpar \vec k_1 \comma \; \vec k_2 \rpar $ in plasma having external static magnetic field. Laser pulses co-propagating perpendicular to a dc magnetic field exert a nonlinear ponderomotive force on plasma electrons, imparting them an oscillatory velocity with finite transverse and longitudinal components. Oscillatory plasma electrons couple with periodic density ripples n′ = nq0eiqz to produce a nonlinear current, i.e., responsible for resonantly driving terahertz radiation at $\lpar {\rm \omega} = {\rm \omega} _1 - {\rm \omega} _2 \comma \; \vec k = \vec k_1 - \vec k_2 + \vec q\rpar $. Effects of THz wave frequency, laser beam width, density ripples, and applied magnetic field are studied for the efficient THz radiation generation. The frequency and amplitude of THz radiation were observed to be better tuned by varying dc magnetic field strength and parameters of density ripples (amplitude and periodicity). An efficiency about 0.02 is achieved for laser intensity of 2 × 1015 W/cm2 in a plasma having density ripples about 30%, plasma frequency about 1 THz and magnetic field about 100 kG.

High power terahertz radiation generation by optical rectification of a shaped pulse laser in axially magnetized plasma

2017 ◽  
Vol 24 (10) ◽  
pp. 103103 ◽  
Author(s):  
Ram Kishor Singh ◽  
Monika Singh ◽  
Satish Kumar Rajouria ◽  
R. P. Sharma
Keyword(s):  
Pulse Laser ◽  
Terahertz Radiation ◽  
High Power ◽  
Magnetized Plasma ◽  
Optical Rectification ◽  
Radiation Generation ◽  
Shaped Pulse
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