In this paper an off-axis holography is put forward based on the Sagnac interferometer. The holograms of alumina-dust aerosol particles, an United States Air Force 1951 resolution plate and paramecium were recorded in the experiment. The diffraction integral of a plane hole derived from quantum theory is illustrated by the variation of the thickness of interference fringes. We use an angular spectrum diffraction algorithm to reconstruct the recorded hologram, and the reconstructed image with high resolution is obtained after eliminating the zero-order image and conjugate image. Examples involving alumina-dust aerosols demonstrate the technique’s in situ imaging capability for complex-shaped particles over a size range of roughly 10–50 m micrometers. The system’s feasibility is analyzed and thus confirmed.

本文提出了一种基于Sagnac干涉仪的离轴全息照相技术。实验中记录了氧化铝粉尘气溶胶颗粒的全息图，美国空军1951年的分辨率板和草履虫。干涉条纹厚度的变化说明了从量子理论推导出的平面孔的衍射积分。我们使用角谱衍射算法来重建记录的全息图，并且在消除了零阶图像和共轭图像之后获得了高分辨率的重建图像。涉及氧化铝粉尘气溶胶的示例证明了该技术对大约10–50尺寸范围内的复杂形状颗粒的原位成像能力米微米。分析并确认了该系统的可行性。