Abstract
We characterize ultrabroadband white-light continuum generated in a 10 mm block of bulk sapphire pumped by ~280 fs, ~ 1 mJ laser pulses at 1053 nm. This results in a smooth and stable spectrum, extending at least from 400 to 1100 nm. The white-light continuum is characterized by using the technique of cross-correlation frequency resolved optical gating (XFROG). We used a high pass filter to minimize the effect of the spectral components above 1000 nm of the continuum spectrum in order to avoid experimental artifacts caused by the intense 1053 nm peak, and we observed good agreement between the retrieved and directly measured spectra.
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