Zhou Wenjia, Wu Donghai, Lu Quan-Yong, Slivken Steven, Razeghi Manijeh
Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208, USA.
Sci Rep. 2018 Oct 5;8(1):14866. doi: 10.1038/s41598-018-33024-7.
We demonstrate single-mode, 16-channel, optical phased arrays based on quantum cascade laser technology, with emission wavelengths around 4.8 µm. The integrated device consists of a distributed feedback seed section, a highly-efficient tree array multi-mode interferometer power splitter, and a 16-channel amplifier array with a 4° angled facet termination. With a single layer YO coating, the angled facet reflectivity is estimated to be less than 0.1% for suppressing amplifier self-lasing. A peak output power of 30 W is achieved with an emission spectrum narrower than 11 nm and a side mode suppression ratio over 25 dB. Far field distribution measurement result indicates a uniform phase distribution across the array output. Using the same phased array architecture, we also demonstrate single-mode 3.8 µm QCL amplifier arrays with up to 20 W output power.
我们展示了基于量子级联激光技术的单模、16通道光学相控阵，其发射波长约为4.8微米。该集成器件由一个分布反馈种子区、一个高效树形阵列多模干涉仪功率分配器以及一个带有4°倾斜端面终端的16通道放大器阵列组成。通过单层YO涂层，倾斜端面反射率估计小于0.1%，以抑制放大器自激振荡。实现了30瓦的峰值输出功率，发射光谱窄于11纳米，旁模抑制比超过25分贝。远场分布测量结果表明阵列输出端相位分布均匀。使用相同的相控阵架构，我们还展示了输出功率高达20瓦的单模3.8微米量子级联激光放大器阵列。
