Speaker: Jerome V. Moloney
Affiliation: University of Arizona
Abstract: A fundamentally new set of paradigms for sustaining individual MWIR and LWIR multi-TW light bullets over multiple kilometer range propagation distances in the atmosphere are identified. The physics can now be described by an optical carrier resolved generalized Modified Kadomtsev Petviashili (MKP) equation derivable from our UPPE model. Two competing singularities emerge: 1) the usual self-focusing collapse associated with the Nonlinear Schroedinger equation; and 2) an optical carrier wave shock singularity. For MWIR wavelength pulses, the latter introduces a new regularization mechanism involving recurrent bursts of shock initiated (dispersive) harmonic waves limiting peak intensities, reducing ionization and eliminating the need for artificial nonlinear saturation effects.
Additional new physics emerges as one moves from MWIR to LWIR wavelengths. Many-body effects associated with Coulomb scattering of weakly ionized electrons associated with spatially separated gas species become dominant and a new mechanism emerges which suppresses the standard Kerr nonlinear self-focusing. Now whole beam self-trapping becomes the dominant pulse transport mechanism replacing nonlinear filamentation. We predict that multi-TW, multi-Joule pulses can be sustained over multiple kilometer ranges. We will present simulations for MWIR and LWIR pulses propagating in two atmospheric transmission windows.
Biography: Jerome V. Moloney1,2 is a Professor of Mathematics and Optical Sciences at the University of Arizona and is Director of the Arizona Center for Mathematical Sciences, an internationally recognized research center in applied mathematics. He is a fellow of the Optical Society of America and a recipient of the Alexander von Humboldt Prize in physics. Research interests span a wide range of photonics and nonlinear optics fields including ultrashort, high power femtosecond pulse propagation; computational nanophotonics, fiber laser modeling, many-body physics of semiconductor optical properties and modeling semiconductor passive and active devices. He has published more than 400 papers in peer-reviewed journals and has given over two hundred invited papers at national and international conferences.
1College of Optical Sciences, University of Arizona, Tucson, AZ 85721
2 Arizona Center for Mathematical Science, University of Arizona, Tucson AZ 85721
Date(s) - Apr 10, 2017
2:00 pm - 3:00 pm
E-IV Elliott Room #53-135
420 Westwood Plaza - 5th Flr., Los Angeles CA 90095