Caley Adam J, Taghizadeh Mohammad R
Diffractive Optics Group, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.
J Opt Soc Am A Opt Image Sci Vis. 2006 Jan;23(1):193-8. doi: 10.1364/josaa.23.000193.
Diffractive optical elements (DOEs) are often used in pattern formation for display purposes. Constructing these images from two or more colors greatly enhances their visual effect. To achieve this with DOEs is not simple, as they are inherently wavelength specific. We discuss an algorithm for designing quantized elements that produce distinct intensity patterns in the far field for two wavelengths. The benefits of applying bias phase to the dual-wavelength problem are investigated. The difference between the best and the worst choice of bias phase is shown to produce a variation of up to 2% in the efficiency. The mean square error can vary by up to a factor of 2 between the best and the worst case. It is also critically important to understand how the values of the two wavelengths affect the result. We present an analysis of how choosing different pairs of wavelengths in the design process affects the quality of our results.
衍射光学元件（DOEs）常用于显示目的的图案形成。用两种或更多种颜色构建这些图像可大大增强其视觉效果。然而，使用衍射光学元件来实现这一点并不简单，因为它们本质上是波长特定的。我们讨论一种设计量化元件的算法，该元件能在远场为两个波长产生不同的强度图案。研究了将偏置相位应用于双波长问题的益处。结果表明，偏置相位的最佳选择和最差选择之间的差异会导致效率变化高达2%。最佳情况和最差情况之间的均方误差可能相差高达2倍。理解两个波长的值如何影响结果也至关重要。我们分析了在设计过程中选择不同的波长对如何影响我们结果的质量。
