Herzig H P, Dandliker R
Appl Opt. 1988 Nov 15;27(22):4739-46. doi: 10.1364/AO.27.004739.
An analytical method to design holographic optical elements for focusing laser scanners, especially disk scanners, with minimum aberrations and optimum scan line definition is reported. The results reveal that the focused spot constraint to a straight line is always astigmatic. However, by accepting small deviations from the straight line, the astigmatism can be eliminated. The second-order analytical solutions are examined with the help of geometrical ray tracing and compared with experimental results. By extending the method to higher-order approximations, it was found that the correction of the aberrations is essentially limited to the direction perpendicular to the scan line.
报道了一种用于设计全息光学元件的分析方法，该方法用于聚焦激光扫描仪，特别是磁盘扫描仪，以实现最小像差和最佳扫描线清晰度。结果表明，聚焦光斑约束在一条直线上时总是存在像散。然而，通过接受与直线的小偏差，可以消除像散。借助几何光线追迹对二阶解析解进行了检验，并与实验结果进行了比较。通过将该方法扩展到高阶近似，发现像差的校正基本上仅限于垂直于扫描线的方向。
