Fujita Kazuue, Hitaka Masahiro, Ito Akio, Yamanishi Masamichi, Dougakiuchi Tatsuo, Edamura Tadataka
Opt Express. 2016 Jul 25;24(15):16357-65. doi: 10.1364/OE.24.016357.
We present ultra-broadband room temperature monolithic terahertz quantum cascade laser (QCL) sources based on intra-cavity difference frequency generation, emitting continuously more than one octave in frequency between 1.6 and 3.8 THz, with a peak output power of ~200 μW. Broadband terahertz emission is realized by nonlinear mixing between single-mode and multi-mode spectra due to distributed feedback grating and Fabry-Perot cavity, respectively, in a mid-infrared QCL with dual-upper-state active region design. Besides, at low temperature of 150 K, the device produces a peak power of ~1.0 mW with a broadband THz emission centered at 2.5 THz, ranging from 1.5 to 3.7 THz.
我们展示了基于腔内差频产生的超宽带室温单片太赫兹量子级联激光器（QCL）光源，其在1.6至3.8太赫兹之间连续发射超过一个倍频程的频率，峰值输出功率约为200微瓦。在具有双上能级有源区设计的中红外QCL中，分别通过分布反馈光栅和法布里-珀罗腔，实现了单模和多模光谱之间的非线性混合，从而实现了宽带太赫兹发射。此外，在150 K的低温下，该器件产生的峰值功率约为1.0毫瓦，宽带太赫兹发射中心位于2.5太赫兹，范围从1.5至3.7太赫兹。
