8 May 2017 Long range robust multi-terawatt MWIR and LWIR atmospheric light bullets
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Abstract
There is a strong push worldwide to develop multi-Joule femtosecond duration laser pulses at wavelengths around 3.5-4 and 9-11μm within important atmospheric transmission windows. We have shown that pulses with a 4 μm central wavelength are capable of delivering multi-TW powers at km range. This is in stark contrast to pulses at near-IR wavelengths which break up into hundreds of filaments with each carrying around 5 GW of power per filament over meter distances. We will show that nonlinear envelope propagators fail to capture the true physics. Instead a new optical carrier shock singularity emerges that can act to limit peak intensities below the ionization threshold leading to low loss long range propagation. At LWIR wavelengths many-body correlations of weakly-ionized electrons further suppress the Kerr focusing nonlinearity around 10μm and enable whole beam self-trapping without filaments.
Conference Presentation
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Jerome V. Moloney, Kolja Schuh, Paris Panagiotopoulos, M. Kolesik, S. W. Koch, "Long range robust multi-terawatt MWIR and LWIR atmospheric light bullets", Proc. SPIE 10193, Ultrafast Bandgap Photonics II, 101930K (8 May 2017); doi: 10.1117/12.2262142; https://doi.org/10.1117/12.2262142
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