面向非零光展度光束的自由曲面光分布调控机制和方法

Beam shaping with freeform optics is one of the frontier technologies in the field of modern optical engineering and has broad application prospects in both military and civilian areas. The nonzero-étendue light beam is expected to be well controlled by taking the optical étendue of light beam into account in the design of freeform surfaces. This strategy has important theoretical and practical application value, because the étendue of an actual light beam usually cannot be ignored and those zero-étendue algorithms become invalid. However, the difficulty of designing freeform optics has been greatly increased due to the nonzero-étendue of an actual light beam. The design of freeform surfaces for redirecting nonzero-étendue light beam has become a challenging and rewarding issue in the field of modern optical engineering. The current methods, such as the optimization-based design and feedback design methods, are very time consuming due to Monte Carlo raytracing and cannot achieve a better control on light propagation due to the limited number of variables used to construct freeform surfaces or due to the zero-étendue algorithms used to calculate the surface profiles. The simultaneous multiple surfaces (SMS) design method is very effective in beam coupling; however, the application of the SMS design method to generating preset light distributions is still in its infancy. Thus, an effective design theory is still urgently required to promote the wide application of freeform optics. To achieve this goal, we propose this project. In this project, the relationship between the étendue of the input light beam and the output light distribution will be explored, and the regulation mechanisms of redirecting nonzero-étendue light beam with freeform surfaces will be revealed and discussed. Then, a mathematical model for redirecting nonzero-étendue light beam with freeform surfaces will be established. The influence of the étendue of the input light beam on the solution to the mathematical model will also be analyzed to make it a complete design theory. The ultimate purpose of this project is to establish an effective and complete design theory, by which the bottlenecks facing us in redirecting nonzero-étendue light beam with freeform surfaces can be solved. This project will not only provide the theoretical support and technical guidance for beam shaping with freeform optics, but also help realize the independent intellectual property rights for our country, which can make our country take the lead in the technological innovations of modern optical engineering.

自由曲面光束调控是先进光学工程领域的前沿代表性技术之一，在军用和民用领域都有着广泛的应用前景。面向非零光展度光束的自由曲面调控，将实际光束的光展度纳入曲面面型设计，有望实现对非零光展度光束的有效调控，具有重要的理论和实际应用价值，但同时光束的非零光展度也大大增大了光束调控的难度。当前非零光展度光束自由曲面调控理论和方法尚不成熟，这成为制约自由曲面光束调控技术普及的主要瓶颈。为此，本项目拟建立光束亮度和输出光分布之间的映射关系，揭示非零光展度光束自由曲面调控机制，构建非零光展度光束自由曲面调控的数学模型，探索光束光展度和自由曲面解空间映射规律，解决非零光展度光束自由曲面调控的瓶颈问题；拟形成一套有效的非零光展度光束自由曲面调控的直接设计方法，完善自由曲面光束调控理论。本项目研究将为自由曲面光束调控奠定坚实的理论和技术基础，推进自主知识产权的形成与掌握，使我国在全球光学工程技术革新中取得先机。

自由曲面光束调控是先进光学工程领域的前沿代表性技术之一，在军用和民用领域都有着广泛的应用前景。面向非零光展度光束的自由曲面调控，将实际光束的光展度纳入曲面面型设计，有望实现对非零光展度光束的有效调控，具有重要的理论和实际应用价值，但同时光束的非零光展度也大大增大了光束调控的难度。当前非零光展度光束自由曲面调控理论和方法尚不成熟，这成为制约自由曲面光束调控技术普及的主要瓶颈。为此，本项目针对自由曲面非零光展度光束调控的瓶颈问题，建立了光束亮度和目标照度之间的映射关系，研究了非零光展度光束自由曲面调控机制，构建了非零光展度光束自由曲面调控的数学模型，探索了光束光展度和自由曲面解空间映射规律，形成了一套有效的非零光展度光束自由曲面调控的直接设计方法。项目进一步探索了该光束调控方法在LED照明和大面积LED均匀背光中的应用，通过将光源出射光束的光展度纳入光束调控，获得了结构简单、尺寸小、性能优异的光束调控元件，验证了本项目所建立的光束调控方法的有效性。本项目对推动自由曲面光束调控技术的发展有积极作用。