Simulations of electromagnetic wave plasma interactions

Kruer, W. L.

doi:10.1029/rs025i006p01351

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…The directional asymmetry in laser writing was originally interpreted based on an anisotropic trapping of electron plasma due to a ponderomotive force 24 , 25 , when the pulse front is tilted in the writing direction. The issue with this explanation is the need of large intensities at the focal plane to observe an effective “snow-plow” displacement of electrons 43 – 45 , which are thought to be difficult to reach in the material due to a laser induced plasma clamping effect 46 . However, it has been determined that in tight focusing regimes (NA > 0.4), voids appear within the first few pulses 47 – 49 .…”

Section: Discussionmentioning

confidence: 99%

Direct Writing with Tilted-Front Femtosecond Pulses

Patel

Svirko

Durfee

et al. 2017

Sci Rep

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Shaping light fields in both space and time provides new degrees of freedom to manipulate light-matter interaction on the ultrafast timescale. Through this exploitation of the light field, a greater appreciation of spatio-temporal couplings in focusing has been gained, shedding light on previously unexplored parameters of the femtosecond light pulse, including pulse front tilt and wavefront rotation. Here, we directly investigate the effect of major spatio-temporal couplings on light-matter interaction and reveal unambiguously that in transparent media, pulse front tilt gives rise to the directional asymmetry of the ultrafast laser writing. We demonstrate that the laser pulse with a tilted intensity front deposits energy more efficiently when writing along the tilt than when writing against, producing either an isotropic damage-like or a birefringent nanograting structure. The directional asymmetry in the ultrafast laser writing is qualitatively described in terms of the interaction of a void trapped within the focal volume by the gradient force from the tilted intensity front and the thermocapillary force caused by the gradient of temperature. The observed instantaneous transition from the damage-like to nanograting modification after a finite writing length in a transparent dielectric is phenomenologically described in terms of the first-order phase transition.

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Section: Discussionmentioning

confidence: 99%

Direct Writing with Tilted-Front Femtosecond Pulses

Patel

Svirko

Durfee

et al. 2017

Sci Rep

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“…The receivers of the array allow measurements at both subharmonics and harmonics of the high-frequency transmission. Two-plasmon decay: An interesting and related topic is the search for the two-plasmon decay instability (Kruer, 1990;DuBois, 2000;DuBois et al, 2011). To search for two-plasmon decay, the HF transmitter frequency should ideally be chosen to be greater than the peak F-region frequency, and the receiving instrument tuned to half and three-halves of the transmitted value.…”

Section: Radio Direction Findingmentioning

confidence: 99%

Science Goals for a High-Frequency Radar and Radio Imaging Array

Isham,

Bullett,

Gustavsson

et al. 2023

Bulletin of the AAS

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We are developing a 2 to 25 MHz, medium and high frequency (MF/HF) antenna array, for radar and radio imaging of the ionosphere. This white paper contains a discussion of the science goals for the array.Science goals include the study of space weather, ionospheric structure and dynamics, meteors, lightning, radio propagation, and plasma physics. Radio imaging is ideal for the study of stimulated ionospheric radio emissions, such as those induced by the Arecibo Observatory high-power HF radio transmitter, which is likely to be restored to operation in the near future.The main array will consist of 64 active crossed antenna elements within a 400-meter-diameter area. Relocatable cable-less antenna elements will also be included, with phase maintained through the use of GPS-disciplined rubidium clocks. These elements may be used independently, or together with the main array for improved imaging resolution.The proposed location is at the site of the former U.S. Air Force Ramey Solar Observatory (RSO), in Aguadilla in northwest Puerto Rico. Radar imaging will be done in collaboration with the University of Colorado and NOAA HF radar system located at the USGS San Juan Observatory in Cayey, 110 km from Aguadilla.A technical description of the array is included in a companion white paper, Technical Design of a High-Frequency Antenna Array for Radar and Radio Imaging of the Ionosphere.

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“…An interesting and related topic is the search for the twoplasmon decay instability (Kruer, 1990;DuBois, 2000;Russell and DuBois, 2001;DuBois et al, 2011). To search for two-plasmon decay, the HF transmission frequency should ideally be chosen to be greater than the peak F-region frequency, and the receiving instrument tuned to one-half and three-halves of the transmitted value.…”

Section: Figurementioning

confidence: 99%

Science goals for a high-frequency radar and radio imaging array

Isham,

Bullett,

Gustavsson

et al. 2023

Front. Astron. Space Sci.

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A medium and high-frequency antenna array for radar and radio imaging of the ionosphere is planned for installation in Aguadilla, Puerto Rico. Science goals include the study of space weather, radio propagation, meteors, lightning, and plasma physics. Radio imaging is ideal for the study of stimulated ionospheric radio emissions, such as those induced by the Arecibo Observatory high-power HF radio transmitter, which is likely to be restored to operation in the near future. The array will be complemented by a wide variety of instruments fielded by collaborators, and will be a rich source of student projects at all levels.

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Simulations of electromagnetic wave plasma interactions

Cited by 7 publications

References 16 publications

Direct Writing with Tilted-Front Femtosecond Pulses

Direct Writing with Tilted-Front Femtosecond Pulses

Science Goals for a High-Frequency Radar and Radio Imaging Array

Science goals for a high-frequency radar and radio imaging array

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