Reflection of electromagnetic waves for oblique incidence on a moving ionization front

Semenova, V. I.

doi:10.1007/bf01030397

Cited by 8 publications

(4 citation statements)

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“…The frequency upshift using an ionization front propagating in the relativistic velocity has been studied [6][7][8][9][10][11]. The ionization front interacting with the counter-propagating electromagnetic (EM) wave upshifts the frequency of the EM wave.…”

Section: Introductionmentioning

confidence: 99%

THz wave up-frequency turning by rapidly plasma creation

et al. 2011

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When plasmas are instantaneously created around an electromagnetic wave, frequency of the wave up-converted to the frequency, which depends on the plasma frequency. This phenomenon is called as the flash-ionization predicted by S. C. Wilks et al [1]. The theory requires not only the plasma creation in time much shorter than an oscillation period of the electromagnetic wave but also plasma length much longer than a wavelength of it. We have demonstrated the proof of principle experiment using the interaction between a terahertz wave and plasmas created by an ultra short laser pulse, which ensures the plasma creation time-scale much shorter than a period of electromagnetic source wave and plasma length longer than a wavelength of the wave. We observed frequency upconversion from 0.35 THz to 3.3 THz by the irradiance of the Ti:sapphire laser in ZnSe crystal.

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Section: Introductionmentioning

confidence: 99%

THz wave up-frequency turning by rapidly plasma creation

et al. 2011

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“…Here, an ionizing beam travelled in the crystal transversely to the shifted pulse creating a purely temporal change in the carrier density with respect to the probe. The interaction between ionization fronts and electromagnetic waves was studied in Semenova (1967Semenova ( , 1972, and the effects of such superluminous fronts were investigated in Savage et al (1993) and used, for example, to upshift dc fields into THz pulses (Hashimshony et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Laser pulse frequency shifting by ionization and recombination fronts in semiconductor plasma

Avitzour

Geltner

Suckewer

2005

J. Phys. B: At. Mol. Opt. Phys.

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We present a highly temporally and spatially resolved direct measurement of the propagation of ionization and recombination fronts in bulk ZnSe. The fronts were created by two-photon absorption (TPA) of 10 ps, 800 nm ‘pump’ pulses incident on both sides of a 1 mm thick crystal. The measurement was achieved by the spectral analysis of the frequency shift of a 100 fs ‘probe’ pulse transversely propagating through the crystal at the time of excitation and recombination. The probe was frequency shifted due to the temporal change in the refractive index of the medium. The delay between the probe and the pumps was finely scanned for time-resolved measurements, while imaging of the probe onto a spectrometer slit provided spatial resolution across the crystal. The spatially and temporally resolved shift agrees well with a model that includes TPA and recombination. Our set-up provides a general technique for measurements of rapid ionization and recombination processes.

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“…It was noted more than 20 years ago [3][4][5][6] that reflection can occur not only from a moving plasma but also from a moving over-dense plasma boundary, such as an ionization or recombination front. Lampe et al [6] studied the interaction of an em wave with an over-dense ionization front moving with superluminous speed.…”

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“…A peculiarity in this case is that the total energy in the secondary waves is smaller than that of the primary wave. This is a well-known effect [3][4][5][6] and it can be attributed to the excitation of a zero frequency pure "magnetic wave" in the plasma with wave number k 0 . The magnetic wave is formed because, when the electrons are suddenly created, they are accelerated by the electric field of the em wave with a phase such as to create the static magnetic field.…”

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Conversion of Electrostatic to Electromagnetic Waves by Superluminous Ionization Fronts

2001

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The conversion of static electric fields to electromagnetic radiation by the incidence of a superluminous ionization front on plasma is investigated. For extremely superluminous fronts, the radiation is close to the plasma frequency and is converted with efficiency of order unity. A proof-of-principle experiment was conducted using semiconductor plasma containing an alternately charged capacitor array. The process has important implications in astrophysical plasmas, such as supernova emission, and to laboratory development of compact, coherent, tunable radiation sources in the THz range.

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Reflection of electromagnetic waves for oblique incidence on a moving ionization front

Cited by 8 publications

References 0 publications

THz wave up-frequency turning by rapidly plasma creation

THz wave up-frequency turning by rapidly plasma creation

Laser pulse frequency shifting by ionization and recombination fronts in semiconductor plasma

Conversion of Electrostatic to Electromagnetic Waves by Superluminous Ionization Fronts

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