Slivken Steven, Wu Donghai, Razeghi Manijeh
Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208, USA.
Sci Rep. 2019 Jan 24;9(1):549. doi: 10.1038/s41598-018-36872-5.
A reflective outcoupler is demonstrated which can allow for stable surface emission from a quantum cascade laser and has potential for cost-effective wafer-scale manufacturing. This outcoupler is integrated with an amplified, electrically tunable laser architecture to demonstrate high power surface emission at a wavelength near 4.9 μm. Single mode peak power up to 6.7 W is demonstrated with >6 W available over a 90 cm (215 nm) spectral range. A high quality output beam is realized with a simple, single-layer, anti-reflective coating. The beam shape and profile are shown to be independent of wavelength.
展示了一种反射式外耦合器，它能够实现量子级联激光器的稳定表面发射，并且具有实现具有成本效益的晶圆级制造的潜力。这种外耦合器与放大的、电可调谐激光架构集成在一起，以展示在波长接近4.9μm时的高功率表面发射。在90cm（215nm）光谱范围内，单模峰值功率高达6.7W，可用功率超过6W。通过简单的单层抗反射涂层实现了高质量的输出光束。光束形状和轮廓显示与波长无关。
