Accession Number : ADA193825

Title :   High Energy and High Intensity Laser Effects on Aerosols: Changes in Droplet Morphology, Surrounding Temperature, and Vapor Concentration.

Descriptive Note : Final rept. 1 Feb 85-31 Jan 88,

Corporate Author : YALE UNIV NEW HAVEN CONN

Personal Author(s) : Chang, Richard K

PDF Url : ADA193825

Report Date : Mar 1988

Pagination or Media Count : 18

Abstract : Nonlinear optical interactions in a droplet occur at remarkably low input intensity levels because the droplets acts as a lens to concentrate the input radiation at a location just within the shadow face and as an optical cavity to provide feedback for the internally generated radiation. LIB within the droplet occurs when the rising portion of the input laser pulse causes multiphoton ionization which is followed by cascade multiplication. The resultant plasma within the droplet transforms a nominally transparent droplet into an absorbing droplet, and the remaining portion of the input laser pulse heats the droplet. Multiple scattering calculations and measurements were made from two closely spaced fibers which served as a prototype of densely packed aerosols. The comparison between the exact calculation for two fibers and the experimental results from the fiber-mirror configuration was excellent and provided new insight into the multiple scattering from closely spaced aerosols.

Descriptors :   *AEROSOLS, *DROPS, CAVITIES, FIBERS, HIGH ENERGY, HIGH RATE, INPUT, INTENSITY, INTERACTIONS, INTERNAL, LASER BEAMS, LENSES, LEVEL(QUANTITY), LOW LEVEL, MORPHOLOGY, MULTIPLICATION, NONLINEAR SYSTEMS, OPTICAL PROPERTIES, OPTICS, PHOTOIONIZATION, PULSED LASERS, RADIATION, RADIATION EFFECTS, SCATTERING, TRANSPARENCE

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE