Accession Number : AD1021274


Title :   Shack-Hartmann Electron Densitometer (SHED): An Optical System for Diagnosing Free Electron Density in Laser-Produced Plasmas


Descriptive Note : Technical Report,03 Jan 2013,30 Apr 2014


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD ABERDEEN PROVING GROUND United States


Personal Author(s) : Valenzuela,Anthony R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1021274.pdf


Report Date : 01 Nov 2016


Pagination or Media Count : 26


Abstract : The Shack-Hartmann Electron Densitometer is a novel method to diagnose ultrashort pulse laser produced plasmas by measuring the phase change to a probe laser beam. Free electrons in a plasma cause distortions to the phasefront of a probe laser that is measured through a lenslet array onto a camera. This method allows for superior performance in measuring minute variations in the electron density in 2 dimensions with sub picosecond time resolution. The data taken demonstrated the ability to diagnose plasmas with densities of the order of 1019 cm-3 and show the temporal evolution of the plasma long after the driving laser pulse has left. The method can be further improved by enclosing the probe beam and adding a second axis to allow for tomographic reconstruction of the electron density in 3 dimensions.


Descriptors :   free electrons , Laser produced plasmas , ELECTRON DENSITY


Subject Categories : Plasma Physics and Magnetohydrodynamics
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE