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Opt Lett. 2009 Oct 15;34(20):3125-7. doi: 10.1364/OL.34.003125.

Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver.

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Dipartimento di Fisica, National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM,Politecnico di Milano, Milano I-20133, Italy.


A temporal gating on the high-order harmonic emission process is achieved using an intense 20 fs, 1.45 microm pulse (IR) in combination with an intense 13 fs, 800 nm pulse [visible (VIS)]. Exploiting this two-color gating scheme, a coherent continuous emission extending up to 160 eV using Ar gas and 200 eV using Ne gas is efficiently generated. The IR pulse contributes to significantly extending the harmonic emission to higher photon energies, whereas the VIS pulse improves the conversion efficiency of the process. These results indicate the possibility to produce bright attosecond pulses approaching the soft X spectral region.

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