Answers are grounded in this paper and cite their sources.
We generate high-order harmonics by using an 800-nm fundamental pulse whose polarization evolves with time. Controlling the ellipticity modulation of the fundamental field allows us to continuously confine the harmonic emission from an estimated minimum value of 7 fs (1fs=10^-15s) up to more than the 35 fs input pulse duration. Depending on the observed harmonic, the harmonic spectrum can show either a narrowing or a broadening when the ellipticity is changed in good agreement with an effective confinement of the high-order harmonic generation.
No takes yet. Share an insight, caveat, or question.
Tcherbakoff et al. (2003) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: