Excitation of terahertz radiation by laser pulses in nonuniform plasma channels

Antonsen, Thomas M.; Palastro, J. P.; Milchberg, H. M.

doi:10.1063/1.2715864

Cited by 129 publications

(49 citation statements)

References 17 publications

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“…The present scheme yields the THz field $10 5 kV/cm and the efficiency $10 À2 for the laser intensity $10 14 Terahertz (THz) radiation generation has become an exciting field of research due to its wide applications in material characterization, imaging, topography and remote sensing, 1 chemical and security identification, etc. 2,3 The researchers all over the world have been putting their efforts to achieve a THz radiation source with large electric field, [4][5][6][7][8][9][10][11][12][13][14][15][16][17] and several schemes have been proposed. THz radiation has been generated with the interaction of superluminous laser pulse with large band gap semiconductors and electro-optic crystals.…”

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confidence: 99%

Strong terahertz radiation by beating of spatial-triangular lasers in a plasma

Malik

Stroth

2011

Applied Physics Letters

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Resonant excitation of terahertz (THz) radiation by beating of two spatial-triangular laser beams having different frequencies and wave numbers but the same electric fields is proposed, where the ponderomotive force in the transverse direction is realized due to the beating and spatial variation of the lasers’ fields. This gives rise to a stronger transient transverse current due to a sharp gradient in the laser field, and subsequently THz radiation is excited resonantly in the presence of a periodic density structure. The present scheme yields the THz field ∼105 kV/cm and the efficiency ∼10−2 for the laser intensity ∼1014 W/cm2.

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confidence: 99%

Strong terahertz radiation by beating of spatial-triangular lasers in a plasma

Malik

Stroth

2011

Applied Physics Letters

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“…Ponderomotive force and nonlinear process in laser plasma interaction are the main mechanisms of THz wave generation. Laser plasma interaction also offers the promise for generating coherent radiation (Nuss & Orenstein, 1997;Yampolsky & Frainman, 2006;Cheng et al, 2001;Antonsen et al, 2007;Gildenburg & Vvedenskii, 2007). For example, coherent pulses of THz radiation are especially of interest for time domain spectroscopy (Nuss & Orenstein, 1997).…”

Section: Introductionmentioning

confidence: 97%

“…Cheng et al (2001) have reported the generation of THz pulse radiation from plasma channels induced by femtosecond light strings, which are generated due to the establishment of a dipole moment in the channel by radiation pressure force of the light string, which oscillates at the plasma frequency and radiates. Antonsen et al (2007) proposed the employment of a corrugated plasma channel for phase matched THz radiation generation by the ponderomotive force of a laser pulse.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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This 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 = 10 14 W/cm 2 , laser beam radius (r 0 ) = 40 μm, laser frequency (ω 0 ) = 10 14 rad/s and plasma density (n 0 ) = 3 × 10 18 cm −3 , normalized ripple density amplitude (μ) = 0.3, the produced THz emission can be at the level of Giga watt in power.

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“…(2) is proportional to, and in phase with, the vector potential. The rate of energy transferred to the electromagnetic wave can be calculated as the power the ponderomotive force does on the plasma current 23 . It follows from this that the action,…”

Section: Spectral Shifting In Tenuous Plasmamentioning

confidence: 99%

“…As a laser pulse propagates through plasma, it loses energy by exciting plasma waves [2][3][4]19,23 .…”

Section: Spectral Shifting In Tenuous Plasmamentioning

confidence: 99%

Pulsed mid-infrared radiation from spectral broadening in laser wakefield simulations

2013

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Spectral red-shifting of high power laser pulses propagating through underdense plasma can be a source of ultrashort mid-infrared (MIR) radiation. During propagation, a high power laser pulse drives large amplitude plasma waves, depleting the pulse energy. At the same time, the large amplitude plasma wave provides a dynamic dielectric response that leads to spectral shifting. The loss of laser pulse energy and the approximate conservation of laser pulse action imply that spectral red-shifts accompany the depletion. In this paper, we investigate, through simulation, the parametric dependence of MIR generation on pulse energy, initial pulse duration, and plasma density.

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Excitation of terahertz radiation by laser pulses in nonuniform plasma channels

Cited by 129 publications

References 17 publications

Strong terahertz radiation by beating of spatial-triangular lasers in a plasma

Strong terahertz radiation by beating of spatial-triangular lasers in a plasma

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

Pulsed mid-infrared radiation from spectral broadening in laser wakefield simulations

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