Laser harmonic generation from a thin metallic foil

A high-power p-polarized laser, obliquely incident on a thin metal foil (i.e., an overdense plasma), induces periodic charge on the surface by emitting electrons into vacuum during a quarter cycle. The electrons are pulled out by the normal component of laser field. As these electrons travel in vacu...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2005-06, Vol.33 (3), p.1036-1040
Main Authors: Chuan Sheng Liu, Parashar, J.
Format: Article
Language:English
Subjects:
Anharmonicity
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron and ion emission by liquids and solids
impact phenomena
Electrons
Exact sciences and technology
Foils
Frequency conversion
Harmonic analysis
Harmonic generation
Harmonic generations
Harmonics
Impact phenomena (including electron spectra and sputtering)
Laser ablation
Laser fusion
laser matter interaction
Laser-beam impact phenomena
Laser-plasma interactions
Lasers
Metals
Optical harmonic generation
Optical surface waves
Orbits
Particle physics
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Power system harmonics
Pump lasers
Pumps
Solids
Surface charge
Surface emitting lasers
X-ray lasers
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Description
Summary:A high-power p-polarized laser, obliquely incident on a thin metal foil (i.e., an overdense plasma), induces periodic charge on the surface by emitting electrons into vacuum during a quarter cycle. The electrons are pulled out by the normal component of laser field. As these electrons travel in vacuum, they see the laser field, as well as a direct current field due to surface charge, giving rise to strong anharmonicity in orbits. These anharmonic oscillating dipoles produce coherent radiation at several harmonics. The power of harmonics goes as square of laser spot size and square of pump power for all the harmonics. It scales as sin/sup 6/ /spl theta//sub i/ with the angle of incidence /spl theta//sub i/. However, it decreases with harmonic number.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2005.848609