Accession Number : AD1013473


Title :   Measurement and Modeling of High Energy Laser (HEL)-Droplet Interactions


Descriptive Note : Technical Report


Corporate Author : U.S. Naval Academy Annapolis


Personal Author(s) : Tracey,Timothy E


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/1013473.pdf


Report Date : 11 May 2016


Pagination or Media Count : 76


Abstract : With the advent of lasers as weapons, it is necessary to understand how a laser propagates through a complex medium. For the U.S. Navy, the complexity of a maritime environment imposes particular challenges for laser propagation due to high concentrations of water vapor and high probabilities of liquid water in the form of fog, rain, or sea spray along the beam path. Although considerable research has gone into characterizing the maritime environment and simulating laser propagation through water vapor and turbulence, the interactions between a high energy laser (HEL) and liquid water are poorly understood. A project is taking place in the U.S. Naval Academys Directed Energy Research Center to investigate the interaction of a high energy laser and single water droplets. An HEL is used to irradiate droplets of water, and the droplet shape and size, the infrared radiation from the droplet, and the transmitted beam profile are measured and recorded. To control the droplet shape, it will be levitated using a commercial ultrasonic levitator, where the drop is held in place at a node by the pressure from a standing sound wave. The results of this experiment will provide an understanding of the coupled interaction between an HEL and a water droplet.


Descriptors :   High energy lasers , Propagation , Vaporization , Directed energy weapons , Laser weapons , Water vapor , rain , fog , Interactions , Laser beams , naval operations


Distribution Statement : APPROVED FOR PUBLIC RELEASE