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White-light generation with sub-ps pulses

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Calendron,  Anne-Laure
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron, and Department of Physics, University of Hamburg, Notkestrasse 85, 22607 Hamburg, Germany ;

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Citation

Calendron, A.-L., Çankaya, H., Cirmi, G., & Kärtner, F. X. (2015). White-light generation with sub-ps pulses. Optics Express, 23(11), 13866-13879. doi:10.1364/OE.23.013866.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-F3EA-7
Abstract
We generate white light supercontinuum from slightly sub-picosecond 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 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.