Compact coherent sub-terahertz sources based on quantum dot laser frequency combs

本研究金计划的目的是显著提升基于频率梳激光器的相干亚太赫兹合成的实验和理论基础。通过设计、开发、加工、表征和演示一种新型的具有多个空间定位吸收体部分和可重构天线的近红外发射单片频率梳量子点环形激光器，我们将构成一种新型的小型化电注入光子平台，用于产生亚太赫兹信号并将其辐射到自由空间。我们将利用量子点激光器特殊的超快增益和吸收动力学以及前所未有的高光-微波转换效率。沿着环形激光腔沿着设计和分布多个吸收器部分将产生主要的决定性优势：通过碰撞脉冲锁模产生和可重构控制亚太赫兹频率，并获得具有低相位噪声的超高脉冲串稳定性，产生高光谱纯度和低振幅噪声。我们的目标是全面研究这种原型电注入亚太赫兹发射机的光学和微波发射动力学，具有窄的射频线宽和亚太赫兹频率可调发射，这可能有助于在太赫兹通信，射电天文学，光学传感和量子光学中开辟新的应用。

The aim of this research fellowship project is to significantly enhance the experimental and theoretical foundations of frequency comb laser based coherent sub-terahertz synthesis. By designing, developing, processing, characterizing and demonstrating a novel class of near-infrared emitting monolithic frequency comb quantum dot ring lasers with multiple spatially located absorber sections and a reconfigurable antenna, we will constitute a novel miniaturized electrically-injected photonic platform for the generation and radiation of sub-terahertz signals into free space. We will make use of the particular ultra-fast gain and absorption dynamics and unprecedented high optical-to-microwave conversion efficiency of quantum dot lasers. Designing and distributing multiple absorbers sections along a ring laser cavity will yield major decisive advantages: the generation and reconfigurable control of sub-terahertz frequencies by colliding pulse mode-locking and access to ultra-high pulse train stability with low phase noise, yielding high spectral purity, and low amplitude noise. We aim to comprehensively study the optical and microwave emission dynamics of such prototypic electrically-injected sub-terahertz transmitters with narrow radio-frequency line width and at sub-terahertz frequency tunable emission that might help opening novel applications in terahertz communications, radioastronomy, optical sensing and in quantum optics.