Harmonic generation and frequency mixing in laser-produced plasmas

Spectral measurements of light scattered at various angles from a laser-produced plasma were made at the laser frequency ωL, and at ωL/2, 3ωL/2, 2ωL, 5ωL/2, and 3ωL using a mode-locked Nd:glass laser to produce intensities of 1016 W/cm2 at the target. Signals were detected at ωL, 3ωL/2, and 2ωL, and their intensities relative to the incident intensity were determined. Upper bounds were set for the intensities at the other frequencies.