激光杂志
激光雜誌
격광잡지
LASER JOURNAL
2012年
5期
4-6
,共3页
大气湍流%高斯-谢尔光束%平均强度%角辰壳
大氣湍流%高斯-謝爾光束%平均彊度%角辰殼
대기단류%고사-사이광속%평균강도%각신각
atmospheric turbulence%Gaussian- Schell- model beam%average intensity%ongular spread
基于广义惠更斯-菲涅耳原理,交叉密度函数以及Rytov’s相位结构函数二次近似,利用傅里叶高斯变换推导出部分相干高斯-谢尔光束在大气湍流中的强度分布表达式,并在此基础上分析了大气湍流对角展宽、桶中功率以及光束漂移的影响。数值结果表明:角展宽和光束漂移与光束的初始半径、光源的相干长度有关;远场能量集中度随湍流强度增加、光源相干宽度减小而减小。
基于廣義惠更斯-菲涅耳原理,交扠密度函數以及Rytov’s相位結構函數二次近似,利用傅裏葉高斯變換推導齣部分相榦高斯-謝爾光束在大氣湍流中的彊度分佈錶達式,併在此基礎上分析瞭大氣湍流對角展寬、桶中功率以及光束漂移的影響。數值結果錶明:角展寬和光束漂移與光束的初始半徑、光源的相榦長度有關;遠場能量集中度隨湍流彊度增加、光源相榦寬度減小而減小。
기우엄의혜경사-비열이원리,교차밀도함수이급Rytov’s상위결구함수이차근사,이용부리협고사변환추도출부분상간고사-사이광속재대기단류중적강도분포표체식,병재차기출상분석료대기단류대각전관、통중공솔이급광속표이적영향。수치결과표명:각전관화광속표이여광속적초시반경、광원적상간장도유관;원장능량집중도수단류강도증가、광원상간관도감소이감소。
Based on the extended Huygens - Fresnel integral, the cross - spectral density and Rytov ' s phase structure function, average intensity is derived by a formula for the Fourier transform of Ganssian function. Angular spread , PIB, beam wander of a partially coherent Gaussian - Schell - model ( GSM ) beam in turbulent atmosphere are found out. It shows that angular spread and beam wander have relation with initial beam radius, initial coherence width in the atmospheric turbulence, The energy centrality will decrease as the turbulence intensity increases, spatial correlation length decreases.