Yield and temporal characterization of high-order harmonics from intense midinfrared excitation of a cesium vapor
نویسندگان
چکیده
Cesium vapor interacting with a tightly focused, intense midinfrared s3.4 mmd 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 5th–9th harmonic orders are generated with sufficient pulse energies s,100 pJd 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.
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