Yang Yue, Wei Tiantian, Zhu Rui, Zong Hua, Lu Junfeng, Li Junchao, Liao Hui, Yu Guo, Pan Caofeng, Hu Xiaodong
Opt Express. 2018 Nov 12;26(23):30021-30029. doi: 10.1364/OE.26.030021.
Developing micro/nanoscale wire lasers with single-mode operation and lasing wavelength modulation is essential for realizing their practical applications such as optical communication and saturated spectroscopy. We demonstrated, to the best of our knowledge, the first tunable single-mode microrod laser without complicated micro/nano-manipulation and without additional environmental requirement. In this letter, we realized the wavelength modulation in a single semiconductor microrod simply and directly by changing the axial location of the active region, owing that the active region position plays a key role in determining the lasing mode of microrod lasers. Based on this feature, we proposed a pair of asymmetrical distributed Bragg reflectors (DBRs) with specific spectral selectivity to be induced in a GaN microrod to realize tunable single-mode lasing in a single semiconductor microrod. By using this method, lasing wavelength can be modulated from 369.5 to 375.7 nm flexibly and repeatedly in a 45 μm GaN microrod with the change of the excitation source position. This approach demonstrates a big application potential in numerous fields consisting of optical telecommunication and environmental monitoring.
开发具有单模运行和激光波长调制功能的微纳尺度线激光器对于实现其诸如光通信和饱和光谱学等实际应用至关重要。据我们所知，我们展示了首个无需复杂微纳操作且无需额外环境要求的可调谐单模微棒激光器。在本信函中，我们通过改变有源区的轴向位置，在单个半导体微棒中简单直接地实现了波长调制，这是因为有源区位置在决定微棒激光器的激光模式方面起着关键作用。基于此特性，我们提出在氮化镓微棒中引入一对具有特定光谱选择性的非对称分布布拉格反射器（DBR），以在单个半导体微棒中实现可调谐单模激光发射。通过使用这种方法，随着激发源位置的变化，在一个45μm的氮化镓微棒中，激光波长可在369.5至375.7nm之间灵活且重复地调制。这种方法在包括光通信和环境监测在内的众多领域展现出巨大应用潜力。
