用于铷基量子技术的795 nm异构集成高效宽可调激光器
Heterogeneously Integrated Efficient and Widely Tunable Lasers at 795 nm for Rubidium-Based Quantum Technologies
- Ghent University（根特大学）
- imec
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出一种基于微转印技术的异构集成激光器，在795 nm实现窄线宽和高功率，并具备宽调谐能力，有望替代宏观外腔激光器用于铷基量子技术。
AI中文摘要：
扩展量子处理器和光学原子钟从根本上要求光学控制系统的尺寸、重量、功耗和成本降低数个数量级。激光器的光子集成对于满足这些要求至关重要。在通过操纵铷原子实现原子钟和量子计算所需的近红外波长下，激光器的集成受到光耦合困难和散热不良的阻碍。在此，我们介绍一种利用微转印技术的晶圆级可扩展方法，将基于GaAs的放大器集成在蚀刻凹槽中，直接与氮化硅波导对接耦合。我们利用这种集成方法演示了扩展腔单模激光器。我们的紧凑型微齿轮激光器在片上输出功率超过22 mW时实现了3 kHz的窄基底线宽——这是780-800 nm波段单模异构集成激光器的纪录——壁插效率为9.4%，展示了这种集成方法的高功率和高效率潜力。此外，我们演示了一种利用游标滤光片的宽可调激光器，实现了9 nm的粗调谐、超过140 GHz的准连续细调谐范围以及45 GHz的无跳模调谐范围。我们可扩展的集成激光器工具包在下一代量子技术和光学原子钟中取代宏观外腔二极管激光器方面显示出巨大潜力。
英文摘要：
Scaling quantum processors and optical atomic clocks fundamentally requires orders-of-magnitude reductions in the size, weight, power, and cost of optical control systems. Photonic integration of lasers is critical to fulfill these requirements. At the near-infrared wavelengths required for atomic clocks and quantum computing through manipulation of rubidium atoms, laser integration is hindered by difficulty in light coupling and poor heat dissipation. Here, we introduce a wafer-scalable method utilizing micro-transfer printing to integrate GaAs-based amplifiers in etched recesses, directly butt-coupled to silicon nitride waveguides. We demonstrate extended-cavity single-mode lasers using this integration approach. Our compact microgear laser achieves a narrow 3 kHz fundamental linewidth at an on-chip output power of >22 mW -- a record for a single-mode heterogeneously integrated laser in the 780-800 nm band -- with a wall-plug efficiency of 9.4%, showcasing the high-power and efficiency potential of this integration approach. Additionally, we demonstrate a widely tunable laser leveraging Vernier filters to achieve lasing with 9 nm coarse tuning, a quasi-continuous fine-tuning range exceeding 140 GHz, and a mode-hop-free tuning range of 45 GHz. Our scalable integrated laser toolkit shows great promise for replacing macroscopic external-cavity diode lasers in next-generation quantum technologies and optical atomic clocks.
