CAJ | 학술논문

透镜列阵( LA)光学系统各子光束在焦面上叠加产生干涉现象，引起光强的小尺度不均匀性。根据广义惠更斯-菲涅耳衍射积分理论和物理光学，推导出了透镜列阵光学系统的光强分布和多光束干涉条纹公式。给出的LA小尺度不均匀性变化规律详细的数值计算结果，与物理光学的公式符合很好。研究发现，适当离焦时光强的高频调制会随之变化，当离焦量Δz=2 mm时，干涉主极大间隔明显减少，小尺度的不均匀性得到了明显的改善。
투경렬진( LA)광학계통각자광속재초면상첩가산생간섭현상，인기광강적소척도불균균성。근거엄의혜경사-비열이연사적분이론화물리광학，추도출료투경렬진광학계통적광강분포화다광속간섭조문공식。급출적LA소척도불균균성변화규률상세적수치계산결과，여물리광학적공식부합흔호。연구발현，괄당리초시광강적고빈조제회수지변화，당리초량Δz=2 mm시，간섭주겁대간격명현감소，소척도적불균균성득도료명현적개선。
The superposition of every sub-beam of the lens array( LA) optical system on focal plan produces interference phenomenon, which leads to small-scale non-uniformity of light intensity. Based on the Huygens-Kirchhoff propagation law and the physical optics, the inten-sity distribution on the target of lens array and the separation of multi-beam interference fringes formula are deduced respectively. The change rule of small-scale non-uniformity with differ-ent off-focus Δz is given by detailed numerical calculations. And it is a good consistency with the physical-optics analysis. The study shows that the high frequency modulation of light inten-sity changes with off-focus degree in the range of appropriate off-focus, and when off-focusΔz= 2mm,the interference speckles become decreasing obviously, and the small-scale non-uniformity is improved obviously.