Harmonic generation in CO2 laser target interaction

Abstract
We report the observation of an extended series of integral harmonic lines in the spectrum of direct backscatter of 10.6‐μm radiation incident at intensities ≳1014 W/cm2 onto planar solid targets. We have observed and spectrally resolved up to the eleventh harmonic (0.95 μm) at intensities well above the plasma continuum background.