Mellette William M, Schuster Glenn M, Ford Joseph E
Opt Express. 2014 May 5;22 Suppl 3:A742-58. doi: 10.1364/OE.22.00A742.
We present a versatile illumination system where white light emitting diodes are coupled through a planar waveguide to periodically patterned extraction features at the focal plane of a two dimensional lenslet array. Adjusting the position of the lenslet array allows control over both the directionality and divergence of the emitted beam. We describe an analytic design process, and show optimal designs can achieve high luminous emittance (1.3x10⁴ lux) over a 2x2 foot aperture with over 75% optical efficiency while simultaneously allowing beam steering over ± 60° and divergence control from ± 5° to fully hemispherical output. Finally, we present experimental results of a prototype system which validate the design model.
我们展示了一种多功能照明系统，其中发光二极管通过平面波导耦合到二维微透镜阵列焦平面处的周期性图案化出射特征。调整微透镜阵列的位置可控制发射光束的方向性和发散度。我们描述了一种解析设计过程，并表明优化设计能够在2×2英尺的孔径上实现高发光度（1.3×10⁴勒克斯），光学效率超过75%，同时允许光束在±60°范围内转向，并将发散度从±5°控制到全半球输出。最后，我们展示了一个原型系统的实验结果，验证了设计模型。
