Abstract

We numerically study the formation and propagation dynamics of 10 μm filaments in the atmosphere. We investigate filament formation of multi-Joule 100 fs and 1 ps duration pulses over propagation lengths of 100 m and find that the carrier self-steepening regularization mechanism predicted for 4 μm wavelengths still holds. In our study we include multiple physical effects ignored in the past, such as rotational Raman and avalanche ionization. In addition we incorporate in our simulations the most detailed dispersive model available for atmospheric air, which includes multiple species, such as O2, N2, Ar, CO2, CO, and CH4, for a variety of humidity levels. Results presented here are expected to have a significant impact in the wider field of nonlinear optics where the use of mid-infrared lasers is rapidly growing.

© 2016 Optical Society of America

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References

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Supplementary Material (12)

NameDescription
» Visualization 1: MP4 (1981 KB)      On-axis electric field versus z for the 100 fs pulse at 0% humidity.
» Visualization 2: MP4 (2179 KB)      On-axis electric field versus z for the 100 fs pulse at 10% humidity.
» Visualization 3: MP4 (2820 KB)      On-axis electric field versus z for the 100 fs pulse at 50% humidity.
» Visualization 4: MP4 (2652 KB)      On-axis electric field versus z for the 1 ps pulse at 0% humidity.
» Visualization 5: MP4 (2487 KB)      On-axis electric field versus z for the 1 ps pulse at 10% humidity.
» Visualization 6: MP4 (2375 KB)      On-axis electric field versus z for the 1 ps pulse at 50% humidity.
» Visualization 7: MP4 (2542 KB)      On-axis spectrum versus z for the 1 ps pulse at 10% humidity.
» Visualization 8: MP4 (2395 KB)      On-axis spectrum versus z for the 1 ps pulse at 50% humidity.
» Visualization 9: MP4 (2844 KB)      On-axis spectrum versus z for the 100 fs pulse at 0% humidity.
» Visualization 10: MP4 (3638 KB)      On-axis spectrum versus z for the 100 fs pulse at 10% humidity.
» Visualization 11: MP4 (3299 KB)      On-axis spectrum versus z for the 100 fs pulse at 50% humidity.
» Visualization 12: MP4 (2700 KB)      On-axis spectrum versus z for the 1 ps pulse at 0% humidity.

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Figures (6)

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Equations (10)

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