Terahertz field excitation by a higher-order Gaussian laser pulse propagating in a magnetized plasma

We develop an analytical model for the generation of terahertz (THz) fields by the propagation of a higher-order Gaussian laser pulse in a magnetized plasma. A higher-mode Gaussian pulse is utilized for this purpose. The plasma nonlinearity is enhanced due to the modified gradient of the Gaussian spatial intensity profile. THz field generated by the transverse wakefields is significantly larger for this kind of laser pulses. The amplitude of THz fields can be enhanced by the flatness parameter of the higher-order Gaussian laser pulse. The fivefold enhancement of the THz field is reported in this study. Furthermore, the applied axial magnetic field also contributes to enhancing the THz field. For higher-order Gaussian laser pulse, the power conversion efficiency of THz field generation in the presence of a magnetized is four times higher than the ordinary Gaussian pulse case. The production of intense THz field with amplitudes belonging to the GV/m range is helpful in various applications such as THz extreme nonlinear optics and probing remote materials efficiently.

[1]  Andrew M. Weiner,et al.  High-power narrow-band terahertz generation using large-aperture photoconductors , 1999 .

[2]  Z. Sheng,et al.  Tunable Circularly Polarized Terahertz Radiation from Magnetized Gas Plasma. , 2015, Physical review letters.

[3]  Z. Sheng,et al.  Emission of electromagnetic pulses from laser wakefields through linear mode conversion. , 2005, Physical review letters.

[4]  Ki-Yong Kim,et al.  Generation of coherent terahertz radiation in ultrafast laser-gas interactionsa) , 2009 .

[5]  Terahertz radiation emission from plasma beat-wave interactions with a relativistic electron beam , 2017 .

[6]  Masayoshi Tonouchi,et al.  Cutting-edge terahertz technology , 2007 .

[7]  D. N. Gupta,et al.  Terahertz radiation generation by a super-Gaussian laser pulse in a magnetized plasma , 2021, Optik.

[8]  Falcone,et al.  Short-pulse terahertz radiation from high-intensity-laser-produced plasmas. , 1994, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[9]  J. A. Chakera,et al.  Scaling up and parametric characterization of two-color air plasma terahertz source , 2020 .

[10]  P. Jha,et al.  Terahertz radiation generation by propagation of circularly polarized laser pulses in axially magnetized plasma , 2017 .

[11]  Z. Sheng,et al.  Single-cycle powerful megawatt to gigawatt terahertz pulse radiated from a wavelength-scale plasma oscillator. , 2008, Physical review. E, Statistical, nonlinear, and soft matter physics.

[12]  K. Tanaka,et al.  Single-cycle terahertz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO3 and applications to nonlinear optics , 2011, Other Conferences.

[13]  George Rodriguez,et al.  Coherent control of terahertz supercontinuum generation in ultrafast laser–gas interactions , 2008 .

[14]  L. Bonacina,et al.  Generation of 30 microJ single-cycle terahertz pulses at 100 Hz repetition rate by optical rectification. , 2008, Optics letters.

[15]  D. N. Gupta.  Optical Second-Harmonic Generation of Terahertz Field from n-type InSb Semiconductors , 2020, Plasmonics.

[16]  Xicheng Zhang,et al.  Materials for terahertz science and technology , 2002, Nature materials.

[17]  White,et al.  Subpicosecond, electromagnetic pulses from intense laser-plasma interaction. , 1993, Physical review letters.

[18]  P. Jha,et al.  Simulation study of terahertz radiation generation by circularly polarized laser pulses propagating in axially magnetized plasma , 2017 .

[19]  B. Ersfeld,et al.  High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole , 2018, Scientific Reports.

[20]  Esarey,et al.  Nonlinear interaction of intense laser pulses in plasmas. , 1989, Physical review. A, Atomic, molecular, and optical physics.

[21]  B. Ersfeld,et al.  Strong terahertz emission from electromagnetic diffusion near cutoff in plasma , 2015 .

[22]  D. N. Gupta,et al.  High-Field Coherent Terahertz Radiation Generation From Chirped Laser Pulse Interaction With Plasmas , 2020, IEEE Transactions on Plasma Science.

[23]  George Rodriguez,et al.  Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields. , 2007, Optics express.