Spectral Evidence for Collisionless Absorption in Subpicosecond Laser-Solid Interactions
Abstract
Second-harmonic emission produced by the interaction of a 130-fs laser pulse with solid aluminum has been spectrally analyzed. For an angle of incidence near 20°, the specular second harmonic is blueshifted when the laser intensity exceeds 5×1016 W/cm2. This effect is also observed in particle-in-cell simulations of the experiment. The blueshift is interpreted as a signature of the onset of absorption due to the anomalous skin effect.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 1999
- DOI:
- 10.1103/PhysRevLett.83.5019
- Bibcode:
- 1999PhRvL..83.5019H