Accession Number : ADA306401
Title : Thermal Blooming During Wind Turbulence, Numerical Model of Adaptive-Optics Systems, and Trichroic Beam Splitter for Deuterium Fluoride Chemical Lasers.(Selected Articles).
Corporate Author : NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
PDF Url : ADA306401
Report Date : 11 MAR 1996
Pagination or Media Count : 50
Abstract : There are various favorable and unfavorable effects on laser beam transmission due to atmospheric conditions, mainly in variable wind force and variable direction relative to height in the atmosphere, such as random up-and-down motion of wind and turbulence in the atmosphere. Usually, winds are favorable to restrain thermal blooming; however, atmospheric turbulence mainly leads to the effect of beam expansion, and reduced beam coherence. The paper presents various wind models. Turbulence is simulated with multiphase shield, with the application of the Kolmogorov spectrum. In section II, fundamental equations are given. In section III, the selection principle of time and space step lengths are discussed. In section IV, the results of calculations are listed along with a brief analysis. In section V, several conclusions are provided in the stages of the study. p3 & 4
Descriptors : *WIND, *TURBULENCE, *THERMAL BLOOMING, *FLUORIDES, *ADAPTIVE OPTICS, *CHEMICAL LASERS, *DEUTERIUM COMPOUNDS, MATHEMATICAL MODELS, COMPUTATIONS, WEATHER, MODELS, NUMERICAL ANALYSIS, COHERENCE, ATMOSPHERIC MOTION, LASER BEAMS, BEAM SPLITTING, PHASE, REDUCTION, TIME, VARIABLES, TRANSMITTANCE, SHIELDING, TRANSLATIONS, EXPANSION, EQUATIONS, SELECTION, CHINA, CHINESE LANGUAGE.
Subject Categories : Thermodynamics
Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE