Double-metal waveguide terahertz difference-frequency generation quantum cascade lasers with surface grating outcouplers
Double-metal waveguide terahertz difference-frequency generation quantum cascade lasers with surface grating outcouplers
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DOI：
10.1063/1.5043095
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发表时间：
2018-10-15
影响因子：
4
通讯作者：
Belkin, Mikhail A.
中科院分区：
文献类型：
--
作者：
Kim, Jae Hyun;Jung, Seungyong;Belkin, Mikhail A.
报道了一种基于腔内差频产生的太赫兹量子级联激光器（QCL）光源，该光源采用双金属波导和表面光栅耦合器。这种配置使得能够在器件有源区中高度限制太赫兹模式，并且能够沿波导的整个长度沿着有效地表面提取太赫兹辐射。该器件在室温下工作在1.9 THz，并产生超过110 μ W的峰值功率输出，中红外到太赫兹转换为150 μ W/W-2。结果表示，与在2 THz以下操作的最佳切伦科夫差频生成QCL设备相比，性能至少提高了2倍。由AIP出版社出版。
We report terahertz quantum cascade laser (QCL) sources based on intra-cavity difference-frequency generation processed into double-metal waveguides with surface-grating outcouplers. This configuration enables high confinement of the terahertz mode in the device active region and efficient surface extraction of terahertz radiation along the entire length of the waveguide. The devices operate at room temperature at 1.9 THz and produce over 110 mu W of peak power output with the mid-infrared-to-terahertz conversion of 150 mu W/W-2. The results represent at least a factor of 2 improvement in the performance compared to the best Cherenkov difference-frequency generation QCL devices operating below 2 THz. Published by AIP Publishing.