AVS 60th International Symposium and Exhibition
    Thin Film Thursday Sessions
       Session TF-ThA

Paper TF-ThA1
Reactive Foil Ignition Threshold Dependence on Laser and Foil Properties

Thursday, October 31, 2013, 2:00 pm, Room 102 C

Session: Energetic Thin Films
Presenter: R.D. Murphy, Sandia National Laboratories
Authors: R.D. Murphy, Sandia National Laboratories
J.P. McDonald, Dow Corning Corporation
D.P. Adams, Sandia National Laboratories
Correspondent: Click to Email
It has been shown that forced mixing of reactive layers (foils) leads to an exothermic release of energy after initiation of mixing by forced impact or pulsed laser irradiation. In this work, in order to understand the ignition of foils initiated by laser irradiation, we present laser ignition thresholds of Al/Pt multilayer reactive foils prepared by sputter deposition. It will be shown that the single-pulse ignition threshold is dependent on both the length of the laser pulse and properties of the foil such as bilayer thickness. The laser pulse length is varied from 100 fs to 100 ms and the bilayer thickness is varied from 20 nm to 200 nm. Models will be presented to account for the dependence of the ignition thresholds on diffusion and laser pulse - foil interaction mechanisms such as melting and ablation. Sandia is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under Contract DE-AC04-94AL85000.