Collective Scattering of Laser Light by a Plasma

Chan, P. W.; Nodwell, R. A.

doi:10.1103/physrevlett.16.122

Cited by 40 publications

(7 citation statements)

References 7 publications

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“…It is quite interesting to study the nonlinear phenomena of the plasma, and there have been several experiments on this problem by means· of laser and microwaves (Chang and Nodwell, 1966;Ramsden and Davis, 1966;Weichel, Avisonis, and Vonderhaar, 1967), most of which are for a higher density plasma. For such low density plasmas as used in this experiment, the nonlinearity of the sheath around the electrodes is so large that it masks the nonlinearity of the plasma itself.…”

Section: Discussionmentioning

confidence: 99%

Demodulation of Amplitude Modulated RF Waves in a Plasma at Resonance

Kawashima

1968

Radio Science

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A laboratory simulation experiment was performed to study the mechanism of the detection of audio waves from nearby radio broadcasting stations by spacecraft‐borne audio detectors in the ionosphere, where the carrier frequencies of the detected radio stations seem to depend on the altitude of space probes within the ionosphere. Two electrodes were immersed in a low density plasma, and an RF wave amplitude modulated by an audio wave was fed to one of them while the other electrode was used to detect the audio wave. The detection of the audio wave is a result of the rectification and integration by the sheath around the electrode (antenna), which has a nonlinear voltage‐current characteristic. The dependence of the carrier frequency on the altitude is explained as a result of series resonance of an inductive plasma with the sheath capacitance. This is just the same as the ordinary resonance probe and the resonance frequency is slightly smaller than the plasma frequency. For a higher modulation frequency, the audio output has a phase lag caused by the integration by a high plasma and sheath impedance. The audio output has a strong dependence on the potential of the receiving electrode (antenna) with respect to the plasma, and it reverses the polarity at the potential where the second derivative with respect to the voltage of the voltage‐current characteristic of the receiving electrode in plasma, is equal to zero. For higher potentials, the amplitude of the audio output shows a large broad maximum, and more than an order of magnitude larger output can be obtained than with the ordinary resonance probe.

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Section: Discussionmentioning

confidence: 99%

Demodulation of Amplitude Modulated RF Waves in a Plasma at Resonance

Kawashima

1968

Radio Science

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“…In this case we might expect to observe some features due to long-range correlations, and in fact calculations and experiment (see Chan and Nodwell (1966), Ramsden and Davies (1966)) confirm the presence of satellites symmetrically displaced from the incident frequency by about the plasma frequency. where n is the quantum efficiency of the photocathode.…”

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confidence: 83%

Enhanced Scattering of Laser Light by Optical Mixing in a Plasma

1971

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“…By the end of 1966 Thomson scattering measurements had been published by a number of groups [23,24,25,26] in multiple countries and was recognized around this time to be a proven experimental technique to measure plasma properties.…”

Section: History Of Thomson Scatteringmentioning

confidence: 99%

Measurements of Relativistic Effects in Collective Thomson Scattering at Electron Temperatures less than 1 keV

Ross

2010

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Collective Scattering of Laser Light by a Plasma

Cited by 40 publications

References 7 publications

Demodulation of Amplitude Modulated RF Waves in a Plasma at Resonance

Demodulation of Amplitude Modulated RF Waves in a Plasma at Resonance

Enhanced Scattering of Laser Light by Optical Mixing in a Plasma

Measurements of Relativistic Effects in Collective Thomson Scattering at Electron Temperatures less than 1 keV

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