日本福井大学的研究人员研制出一种激光光束组合器,其仅有一粒米大小,却可为智能穿戴设备提供屏幕扫描方案。这个激光光束组合器包含3种光波导和3个定向耦合器。研究人员介绍,耦合器可将一种光输入转换成为另一种。图中绿光由光波导中心穿过,由始至终都呈直线。而另外两个发生弯曲的光束则是蓝色和红色光。其中,3个光束的位置次序是非常重要的,因为这将直接影响到最后光输出的效率。在光波导的输出端,3个光 Researchers at Japan’s Fukui University have developed a laser beam combiner that offers a screen-scanning solution for smart wearable devices in just one grain of rice. This laser beam combiner contains 3 types of optical waveguides and 3 directional couplers. The researchers introduced the coupler to convert one light input into another. Green light from the center of the optical waveguide through, always straight line. The other two bent beams are blue and red. Among them, the order of the three beams is very important, because it will directly affect the efficiency of the final light output. At the output of the optical waveguide, three lights