波长量级定向发射的低阈值微盘激光器的基础研究

发展低能耗绿色产业以实现国家经济转型、国民收入增长是我国十二五期间的重大战略目标之一。作为一种广泛应用的关键元件，微型激光器也面对着严峻挑战- - 即在保持现有激光特性的同时完成降低能耗的目标。对于微型激光腔体设计而言，尤其在低能耗所需要的波长量级的小型腔内，光的能耗降低和激光的定向发射等性质存在一定的矛盾：单方向发射的微腔的Q值很低，而高Q值微腔一般不存在单向出射。通过本项目的实施，申请人计划在原有的微型激光器研究的基础上，通过理论设计和工艺改进两个方面，开展低能耗定向发射的半导体激光器的研究。通过模式耦合带来的模场的相互作用，设计、制备出一种具有高Q值（低阈值）、单向发射的波长量级或亚波长量级的微型激光器，进而揭示出波长量级低能耗激光器的设计机制，为低能耗集成激光光源以及量子光源的发展奠定基础。

With the rapid progess on the eccnomy, enviromental pollution and energy crisis have become a serious problem for our country and obstacled the sustainable development. Thus energy-saving and enviroment protection is one of the strategic objectives of the national 12th five-year plan to achieve the eccnomic transformation and personal income growth. As the key element of optical storage, optical computing, integrated optics, laser printing, and optical interconnect, micro-laser also faces the challenging from the new concept of green eccnomy, e.g., the energy consumption must be significantly reduced while maintianing the unique laser properties such as unidirectional outputs and ultra-low threshold. However, the regular microlasers, especially the wavelength-scale lasers with lower energy consumption, always have a trade-off between the unidirectional emission and high Q factors. Some designs with unidirecitonal outputs are associated with the serious Q-spoiling, whereas the high Q ones have nearly isotropic outputs. Therefore, the breakthrough in both concepts and technologies is required and essential. In this project, based on our former studies on microlasers, we will focus on the formation of ultra-low threshold unidirectional laser emission. By introducing the mode coupling theory and the field pattern reconstruction, we will be able to obtain unidirectional emission from ultrahigh Q resonances that have non-directional outputs initially. Our new mechanism and the corresponding ultra-low energy consumption wavelgnth-sacle lasers will shed light on the applications of energy-saving on-chip coherent light sources and quantum light sources.