White-light generation with sub-ps pulses

Anne-Laure Calendron, Hüseyin Çankaya, Giovanni Cirmi, Franz X. Kärtner
2015 Optics Express  
We generate white light supercontinuum from slightly subpicosecond pulses at 1.03 µm and 515 nm. We compare the spectra and stability for various crystals, focusing conditions and pulse durations, and determine the best parameters for sub-picosecond driver pulse duration. Comparing the experimental observations with the theory of white-light generation from Brodeur and Chin, it appears that in this particular range of pump pulse duration, two mechanisms interact and prevent a catastrophic
more » ... catastrophic collapse of the beam: multi-photon excitation (typical for ~100-fs-long pulses) and avalanche ionization (typical for >1-ps pulses). The two processes both manifest themselves in different experimental observations.
doi:10.1364/oe.23.013866 pmid:26072757 fatcat:r6qeyxcn4jgf7c47sjiyewprke