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 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.

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

scholarly journals Enhanced terahertz radiation generation by two-color laser pulses propagating in plasma

2016 ◽  
Vol 34 (2) ◽  
pp. 378-383 ◽  
Author(s):  
N.K. Verma ◽  
P. Jha
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Numerical Model ◽  
Laser Pulses ◽  
Magnetized Plasma ◽  
Thz Radiation ◽  
Homogeneous Plasma ◽  
One Dimensional ◽  
Radiation Generation ◽  
Transverse Electromagnetic

AbstractA one-dimensional (1D) numerical model for studying enhanced terahertz (THz) radiation generation by mixing of ordinary and extraordinary modes of two-color laser pulses propagating in magnetized plasma has been presented. The direction of the static external magnetic field is such that one of the two laser pulses propagates in the extraordinary mode, while the other pulse propagates in the ordinary mode, through homogeneous plasma. A transverse electromagnetic wave with frequency in the THz range is generated due to the presence of the external magnetic field. It is observed that larger amplitude THz radiation can be generated by mixing of the ordinary and extraordinary modes of the two-color laser pulses as compared with the single laser pulse propagating in the extraordinary mode. Further, 2D simulations using the XOOPIC code show that the fields obtained via simulation study are compatible with those obtained from the numerical model.

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