关键词：半导体激光器；小激光器；高效；便宜
摘 要：Over the past few decades, semiconductor lasers have relentlessly followed the path towardsminiaturization. Smaller lasers are more energy effcient, are cheaper to make, and open upnew applications in sensing and displays, among many other things. Yet, up until recently,there was a fundamental problem with making lasers smaller: purely semiconductor lasers couldn't be made smaller than the di raction limit of light.