Accession Number : ADA614567


Title :   Guiding Supersonic Projectiles Using Optically Generated Air Density Channels


Descriptive Note : Interim rept. June 2014 January 2015


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV


Personal Author(s) : Sprangle, Phillip ; Johnson, Luke A


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a614567.pdf


Report Date : 24 Mar 2015


Pagination or Media Count : 16


Abstract : We investigate the feasibility of using optically generated channels of reduced air density to provide trajectory correction (guiding) for a supersonic projectile. It is shown that the projectile experiences a force perpendicular to its direction of motion as one side of the projectile passes through a channel of reduced air density. A single channel of reduced air density can be generated by the energy deposited from filamentation of an intense laser pulse. We propose changing the laser pulse energy from shot-to-shot to build longer effective channels. Current femtosecond lasers systems with multi-millijoules pulses could provide trajectory correction of several meters on 5 km trajectories for sub-kilogram projectiles traveling at Mach 2 to Mach 3.


Descriptors :   *GUIDED PROJECTILES , AIR , CHANNELS , DENSITY , PULSED LASERS , SUPERSONIC CHARACTERISTICS , TRAJECTORIES


Subject Categories : Guided Munitions


Distribution Statement : APPROVED FOR PUBLIC RELEASE