Terahertz sources based on Čerenkov difference-frequency generation in quantum cascade lasers
Terahertz sources based on Čerenkov difference-frequency generation in quantum cascade lasers
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DOI：
10.1063/1.4729042
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发表时间：
2012-06
影响因子：
4
通讯作者：
K. Vijayraghavan;R. W. Adams;A. Vizbaras;M. Jang;C. Grasse;G. Boehm;M. Amann;M. Belkin
中科院分区：
文献类型：
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作者：
K. Vijayraghavan;R. W. Adams;A. Vizbaras;M. Jang;C. Grasse;G. Boehm;M. Amann;M. Belkin
我们报道了基于切伦科夫差频产生的双波长中红外量子级联激光器的室温太赫兹源，该激光器具有源于亚带间跃迁的巨大谐振光学非线性。切伦科夫差频产生方案允许沿激光波导的整个长度提取太赫兹辐射，并提供定向太赫兹发射。通过实验，我们的源证明了高达70 μW/W2的转换效率，大约比以前的报告提高了一个数量级。
We report room-temperature terahertz sources based on Cerenkov difference-frequency generation in dual-wavelength mid-infrared quantum cascade lasers with giant resonant optical nonlinearities originating from intersubband transitions. A Cerenkov difference-frequency generation scheme allows for extraction of THz radiation along the whole length of the laser waveguide and provides directional terahertz emission. Experimentally, our sources demonstrate a conversion efficiency of up to 70 μW/W2 approximately an order of magnitude improvement over the previous reports.