Abstract
Cesium vapor interacting with a tightly focused, intense midinfrared source produces high harmonic radiation in the visible∕UV spectral range. The measured yields of harmonic orders 9–17 are found to yield good quantitative agreement with numerical simulations that include both the single-atom and the macroscopic response. The harmonic orders are generated with sufficient pulse energies for direct temporal measurements using an autocorrelation method and when correlated with bandwidth measurements are found not to be transform limited. A blueshift connected to a strong time-dependent ionization appears to be the cause of this spectral broadening.
- Received 13 November 2003
DOI:https://doi.org/10.1103/PhysRevA.69.033807
©2004 American Physical Society