CAJ | 학술논문

为了研究矩形光阑边长与透镜像方焦面处光束光斑尺寸以及光斑内所包含功率的关系,根据高斯光束经矩形光阑和透镜变换后在透镜像方焦面的衍射场分布表达式,采用MATLAB进行数值计算的方法,进行了理论分析.结果表明,当光阑对光束的衍射影响明显时,光束衍射场的中央亮条纹的宽度随着光阑边长的增大而减小:当光阑对光束的衍射影响极小时,中央亮条纹的宽度随着光阑边长的增加而阶跃变化,中央亮条纹强度的半最大值宽度随着光阑边长的增大而减小:当光阑对光束衍射影响极小时,中央亮条纹半最大值宽度趋近于一定值.给出的中央亮条纹强度半最大值宽度与矩形光阑边长关系的拟合表达式,可为激光应用装置的设计提供理论支持.
위료연구구형광란변장여투경상방초면처광속광반척촌이급광반내소포함공솔적관계,근거고사광속경구형광란화투경변환후재투경상방초면적연사장분포표체식,채용MATLAB진행수치계산적방법,진행료이론분석.결과표명,당광란대광속적연사영향명현시,광속연사장적중앙량조문적관도수착광란변장적증대이감소:당광란대광속적연사영향겁소시,중앙량조문적관도수착광란변장적증가이계약변화,중앙량조문강도적반최대치관도수착광란변장적증대이감소:당광란대광속연사영향겁소시,중앙량조문반최대치관도추근우일정치.급출적중앙량조문강도반최대치관도여구형광란변장관계적의합표체식,가위격광응용장치적설계제공이론지지.
Based on the expression of diffractive field distribution of the Gaussian beams restricted by a rectangular aperture and focalized by a lens,the relationship between the width of the rectangular aperture and the spot size of the restricted beam,as well as the relationship between the aperture width and the power in the bucket,was numerically calculated with MATLAB.It was illuminated that the width of the centre bright fringe decreased along with the increasing width of the rectangular aperture when the effect of the aperture on the beam couldn ' t be ignored,however,the width of centre bright fringe step changed with increase of the size of the aperture when the effect could be ignorable,the width of the half maximum intensity of the centre bright fringe decreased along with the accretion of the width of the aperture and then it tends to a constant.The piecewise function of the relationship between the full width at half maximum(FWHM) of the centre bright fringe and the rectangular aperture width was put forward as well.The conclusions are useful for the design of a laser facility.