A single pair of beams does not, however, produce a useful image. To do that requires scanning the object beam through the target about a hundred different ways.
不过仅利用一对光束并不能得到有用的图像，还需要从大约100个不同的角度让物体光束扫描目标。
The analysis is made based on the reciprocity of object beam with reference beam and experimental results are presented in this paper.
本文用物光、参考光地位对等的观点来进行分析，并给出了实验结果。
The results show that diffraction efficiency of a lossless grating increases with the higher ratio of reference beam width to object beam width.
对于无吸收的光栅，参考光束相对物光束越宽，衍射效率将越高。
The results show that diffraction efficiency of a lossless grating increases with the higher ratio of reference beam width to object beam width.
对于无吸收的光栅，参考光束相对物光束越宽，衍射效率将越高。
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