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本文介绍了一种衍射光学器件光线追迹的方法，并给出了计算公式。作为验证，在实验室里制作了具有连续相位的体全息器件，将其实际再现光斑与计算点列图进行比较。构造透射体全息片的物光为离轴的球面波，始于轴外点Ａ（０，１３２ｓｉｎ８°，－１３２ｃｏｓ８°），参考光为平面光束，其与Ｚ轴夹角为１７°。激光器采用氩离子激光器（Ｓｐｅｃｔｒａ－ｐｈｙｓｉｃｓＭｏｄｅｌ２０２０），波长４８８ｎｍ；干板感光胶为重铬酸明胶（ＤＣＧ），胶层厚为１５μｍ；通光口径３０ｎｍ。测试时把全息片放在干板的位置。挡住物光，让再现光以和参考光路相同的路径平行入射到全息片上，在全息片后垂直光轴放置毛玻璃片，平行光轴移动毛玻璃片，可观察到－１级衍射光的变化。在距离原点的距离分别为（ａ）４０ｍｍ，（ｂ）７０ｍｍ，（ｃ）８７ｍｍ，（ｄ）９５ｍｍ的地方用ＣＣＤ拍摄了衍射光的形状，与程序计算的点列图在形状和大小上都吻合
In this paper, a method of ray tracing of diffractive optics is introduced and the calculation formula is given. As proof, a volume holographic device with a continuous phase was made in the laboratory and its actual reconstructed spot was compared with a calculated dot plot. The object light which constructs the transmission hologram is an off-axis spherical wave, starting from the out-of-axis point A (0,132sin8 °, -132cos8 °). The reference beam is a plane beam with an angle of 17 ° to the Z axis. Laser using argon ion laser (Spectra-physicsModel2020), a wavelength of 488nm; dry plate photosensitive glue is dichromated gelatin (DCG), the glue layer thickness of 15μm; Holographic test piece placed on the plate position. The object light is blocked so that the reproduced light is incident on the hologram in parallel with the reference light path in the same way. After the hologram is placed on the vertical optical axis, ground glass is moved and the parallel optical axis is used to move the ground glass. The shape of the diffracted light was photographed by CCD at a distance of 40 mm, (b), 70 mm, (c) 87 mm, and (d) 95 mm from the origin, both in shape and size Anastomosis