体全息成像系统的深度分辨率特性分析

Resolution Characteristics of Volume Holographic Imaging System

通过分析探测点光源在x、y、z轴偏移时的衍射光场分布,研究了以球面参考光和平面物光波记录的体全息透镜系统的成像特性.结果表明:探测点光源在z轴偏移,引起衍射场的显著变化,并且衍射成像光场分布不再为理想成像点,而是在成像面上呈现扩展分布,成像质量明显下降;探测点光源在x、y轴偏移,衍射场变化不明显,成像质量无显著变化.

VHI recording with a spherical reference and a plane signal beams were introduced,and the total diffracted field intensity with displacement of the input point source （the probe source）, away from a reference location in the direction x,y,z,was analyzed. The results show that the observed diffracted field obviously changes with the displacement in the direction z,and the observed diffracted field is suboptimal and spread on the detector plane with the displacement increase. The diffracted field intensity is nearly unchanged with displacement in the direction x,y.