摘要
梯度折射率(GRIN)透镜的像差会导致像面弥散斑增大从而降低透镜的聚焦性能。基于激光全息成像理论,利用全息技术来校正GRIN透镜的像差,从而改善其聚焦性能。通过对GRIN透镜全息校正系统的仿真,计算了全息记录时通过GRIN透镜的物光波在全息图上的相位分布,得到其波像差为0.34λ;分析了全息再现时全息干版的轴向位移对像面弥散斑成像质量的影响,提出一种通过引入轴上点像差平衡轴外点像差的方法并进一步提高了聚焦性能。结果表明:应用该方法在1.5°视场内,弥散斑均方根半径值由14.1μm减小到7.2μm。在3°全视场内,弥散斑均方根半径值均在衍射极限范围内,能够满足GRIN透镜在重叠复眼成像系统中的聚焦要求。
The aberration of gradient-index (GRIN) lens results in the enlargement of the spot in image plane and thus degrades the focusing performance of the lens. Based on the holographic optical imaging theory, the aberration of GRIN lens was corrected using holographic technique to improve the focusing performance. According to simulation of holographic correction system of GRIN lens, the phase distribution of the object wave through GRIN lens on hologram was calculated, resulting in a wave aberration of 0.34 λ. The influence of the axial displacement of hologram on the spot image quality was analyzed during the hologram reconstruction, and a method was proposed to further improve the focusing performance by introducing the axial aberration to balance the abaxial aberration of GRIN lens. The results indicate that using this method the Root-Mean-Square(RMS) radius of spot decreases from 14.1 μm to 7.2 μm in the 1.5°field of view, and the RMS radius of spot was well within the diffraction limit in 3° full field of view, which could satisfy the focus requirement of GRIN lens in superposition compound eyeimaging system.
出处
《红外与激光工程》
EI
CSCD
北大核心
2012年第12期3349-3354,共6页
Infrared and Laser Engineering
基金
国家高技术研究发展计划(2007AA12Z113)
关键词
全息
聚焦性能
全息校正技术
GRIN透镜
holography
focusing performance
holographic correction technique
GRIN lens