Laser Propagation In Heterogeneous Media
Abstract
Laser source detection is extremely important in modern military applications, as laser assisted weapons play an ever increasing rol"e in the modern warfare. Effective countermeasures can only be created if one can develop stable techniques for the reconstruction of both the direction of the laser propagation and the location of its original source. This is difficult as one can usually rely only on off-axis measurements. This proposal focuses on off-axis detection of narrow beam high power laser signals. The direct beam spr"eading comes from two phenomena: first, a standard geometric spreading of the beam, and, second, a predominantly peaked forwardscat""tering by the microscopic particles inside the beam, causes the beam to widen. We plan to developnonlinear wave propagation scenari"os to accurately model laser propagation in various turbulent atmospheres. The off-axis signal in laser propagation problems comes f"rom the (primarily atmospheric) scattering of the direct beam, and may be measurable if the original signal is sufficiently strong." We plan to develop an inverse transport (tomography) setting where the main characteristics of the laser beam are reconstructed fro"m the available off-axis measurements. Specifically, we plan to assess which parameters may be reconstructed and with which stabilit"y with respect to model and measurement errors. We plan to understand how such reconstructions are affected by the aforementioned nonlinear beam propagation scenarios.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 06, 2017
- Source ID
- N000141812001
Entities
People
- Guillaume Bal
Organizations
- Office of Naval Research
- United States Navy
- University of Chicago