Accession Number : AD1011291


Title :   UV/IR Filaments for High Resolution Novel Spectroscopic Interrogation of Plumes on Nuclear Materials


Descriptive Note : Technical Report,20 Jun 2011,19 Feb 2015


Corporate Author : University of New Mexico Albuquerque United States


Personal Author(s) : Diels,Jean-Claude ; Arissian,Ladan ; Lenzner,Matthias ; Hecht,Adam


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1011291.pdf


Report Date : 01 Jun 2016


Pagination or Media Count : 44


Abstract : In recent years, there has been a steady development of techniques to detect nuclear and radiological materials at standoff distances for nuclear nonproliferation and national security. These techniques include neutron detectors [1] and gamma-ray detectors [2] which require the production of highly energetic (MeV) electron beams, by large, heavy accelerators. An investigation of several technique involving either a light filament, or a combination of light filaments, was made. The objective was to evaluate linear and nonlinear techniques that can be exploited for remote sensing with filaments. A long term objective was to obtain a remote signature of both the chemical composition and isotopic content of materials that result from the decay of radioactive materials involved in a nuclear explosion. New diagnostic techniques were developed leading to a better understanding of filaments. These include influence of polarization, with either standard initial condition (beam focalization in air) or controlled initial condition (launching filaments from a focal spot in vacuum), developing a new video technique to visualize the evolution of the filamented pulse and plasma emission in time, space and frequency. Developments of a new source confirmed the creation of non diffracting ultraviolet filament, i.e. pulses of slightly less than 200 ps and 200 mJ energy, at 266 nm, confined to less than 1 mm diameter by nonlinear interaction with air, reported earlier [3].


Descriptors :   Nuclear Materials , ULTRAVIOLET LASERS , laser pulses , spectroscopy , optical properties , refractive index , wave mixing , light sources , electromagnetic scattering , nonlinear optics , electromagnetic metamaterials , refraction , dielectric gases , wave propagation , RADIOACTIVITY , NUCLEAR EXPLOSION DETECTION , VIDEO IMAGES


Distribution Statement : APPROVED FOR PUBLIC RELEASE