Fig. 10
From: High power, dual SWIR-MIR OPCPA source for high-order harmonics generation
Pulse duration dependent HHG spectra in ZnO. Top figure: measured HHG spectra for a GDD of – 2.3 \(\times 10^{4}\) fs\(\phantom{0}^{2}\) applied to the Dazzler, producing near-transform limited 60 fs pulses. Bottom figure: corresponding measured spectra for GDD of – 1.9 \(\times 10^{4}\) fs\(\phantom{0}^{2}\) applied to the Dazzler (160 fs pulses). Due to the large difference in signal magnitude, below-band gap and above-band gap HHG are plotted with separate vertical axes to facilitate comparison.
