Vanvoorhies K L, Aleksoff C C
Appl Opt. 1977 Sep 1;16(9):2441-4. doi: 10.1364/AO.16.002441.
Objects can be imaged if passed through a field formed by the interference of a Hermite-Gaussian (modal) laser beam with a spatial offset reference beam. The light intensity scattered by the object is electronically detected and spatially recorded onto film moving synchronously with the object. The recording is a hologram. In the reconstruction of the hologram, each object point produces a modal beam, and this collection of modal beams is matched filtered to yield an image characterized by a point spread function of Laguerre- Gaussian form. The resolution is dependent upon the waist size and order of the modal beam and is invariant with respect to object/source/detector distances. Theoretical and experimental results are given.
如果物体穿过由厄米-高斯（模态）激光束与空间偏移参考光束干涉形成的场，就可以对其进行成像。物体散射的光强通过电子方式检测，并在与物体同步移动的胶片上进行空间记录。该记录即为全息图。在全息图的重建过程中，每个物点都会产生一个模态光束，并且对这组模态光束进行匹配滤波，以生成一个具有拉盖尔-高斯形式点扩散函数特征的图像。分辨率取决于模态光束的束腰尺寸和阶数，并且与物体/光源/探测器的距离无关。文中给出了理论和实验结果。
