Figure 1

(a) Na excitation scheme for the generation of coherent broadband DUV radiation by shaped NIR femtosecond pulses via resonance-mediated (2+1) three-photon excitation to a broad far-from-resonance continuum. (b) The Spectrum of the driving NIR femtosecond pulses. (c) The Spectrum of the coherent broadband DUV radiation generated by the NIR transform-limited pulse.Reuse & Permissions

Figure 2

Results for the NIR resonance-mediated chirp control of the broadband DUV radiation coherently generated in Na by linearly chirped NIR femtosecond pulses. (a) Experimental results for the spectral intensity (color coded) measured at each DUV frequency as a function of the applied NIR chirp. Each DUV spectrum at a given chirp value is normalized (independently) by its maximal intensity. (b), (c) Experimental results (circles) for the NIR-chirp dependence of the measured peak DUV frequency and DUV bandwidth (FWHM), respectively, as obtained from the data of (a). Corresponding calculated results (lines) are also shown. The dashed lines in (a) and (b) indicate the DUV frequency of $3{\omega }_{4s,3s}/2$ (see text).Reuse & Permissions