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12 Apr 2010

Volume 96, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 96, 153701 (2010); http://dx.doi.org/10.1063/1.3385388 (3 pages)

Sinan Keten and Markus J. Buehler
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Laser wavelength effects on ionic and atomic emission from tin plasmas

D. Campos, S. S. Harilal, and A. Hassanein

Appl. Phys. Lett. 96, 151501 (2010); http://dx.doi.org/10.1063/1.3386524 (3 pages) | Cited 15 times

Online Publication Date: 12 April 2010

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We investigated the effects of laser wavelength on atomic and ionic emission from Sn plasmas. Plasmas were produced using planar Sn targets excited with 10.6 μm carbon dioxide (CO2) and 1.06 μm neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers. Two-dimensional spectral imaging of visible emission showed that continuum emission was significantly more intense in the CO2 laser produced plasma (LPP) whereas line emission was considerably more extensive in the Nd:YAG LPP. Faraday cup analysis showed that ion profiles were narrower with CO2 LPPs although they possessed higher kinetic energies.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Numerical modeling of a table-top tunable Smith–Purcell terahertz free-electron laser operating in the super-radiant regime

C. Prokop, P. Piot, M. C. Lin, and P. Stoltz

Appl. Phys. Lett. 96, 151502 (2010); http://dx.doi.org/10.1063/1.3386543 (3 pages) | Cited 11 times

Online Publication Date: 16 April 2010

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Terahertz (THz) radiation occupies a very large portion of the electromagnetic spectrum and has generated much recent interest due to its ability to penetrate deep into many organic materials without the damage associated with ionizing radiation such as x-rays. One path for generating copious amount of tunable narrow-band THz radiation is based on the Smith–Purcell free-electron laser (SPFEL) effect. In this paper we propose a simple concept for a compact two-stage tunable SPFEL operating in the super-radiant regime capable of radiating at the fundamental bunching frequency. We demonstrate its capabilities and performances using the conformal finite-difference time-domain electromagnetic solver VORPAL.
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41.60.Cr Free-electron lasers
42.60.Fc Modulation, tuning, and mode locking
02.70.Bf Finite-difference methods

Microwave resonances of a hairpin probe in a magnetized plasma

G. S. Gogna and S. K. Karkari

Appl. Phys. Lett. 96, 151503 (2010); http://dx.doi.org/10.1063/1.3400214 (3 pages) | Cited 2 times

Online Publication Date: 16 April 2010

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The effect due to the electron cyclotron frequency on the microwave resonances of a hairpin probe is investigated in a moderate to strongly magnetized plasma. The magnetic field is independently varied over a wide range from 0.01–0.13 T while maintaining the local plasma density constant. At strong magnetic fields the resonance frequency is found to be lower than that measured in vacuum implying that the relative plasma dielectric permittivity, εp>1. It is proposed that the experiments reported here are consistent with a permittivity model that includes magnetic field.
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52.70.Ds Electric and magnetic measurements
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.25.Mq Dielectric properties
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