Broadly tunable terahertz generation in mid-infrared quantum cascade lasers
Broadly tunable terahertz generation in mid-infrared quantum cascade lasers
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DOI：
10.1038/ncomms3021
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发表时间：
2013-06-01
影响因子：
16.6
通讯作者：
Belkin, Mikhail A.
中科院分区：
文献类型：
--
作者：
Vijayraghavan, Karun;Jiang, Yifan;Belkin, Mikhail A.
在太赫兹光谱范围内的室温、宽可调谐、电泵浦半导体源在操作简单性上类似于二极管激光器，对于应用是高度期望的。该领域的一项新兴技术是基于双波长中红外量子级联激光器中的腔内差频产生的源。在这里，我们报告太赫兹量子级联激光源的基础上优化的非共线切伦科夫差频产生方案，表现出显着的性能改善。在4THz发射的器件显示出超过0.6mWW（-2）的中红外到太赫兹转换效率，并提供近0.12mW的峰值功率输出。在室温下，在同一芯片上制造的2和3 THz发射的器件分别显示出0.09和0.4mWW（-2）的转换效率。切伦科夫方案提供的高太赫兹产生效率和宽松的相位匹配条件使我们能够首次展示在1.70和5.25 THz之间可调谐的外腔太赫兹量子级联激光源。
Room temperature, broadly tunable, electrically pumped semiconductor sources in the terahertz spectral range, similar in operation simplicity to diode lasers, are highly desired for applications. An emerging technology in this area are sources based on intracavity difference-frequency generation in dual-wavelength mid-infrared quantum cascade lasers. Here we report terahertz quantum cascade laser sources based on an optimized non-collinear Cherenkov difference-frequency generation scheme that demonstrates dramatic improvements in performance. Devices emitting at 4 THz display a mid-infrared-to-terahertz conversion efficiency in excess of 0.6mWW(-2) and provide nearly 0.12mW of peak power output. Devices emitting at 2 and 3 THz fabricated on the same chip display 0.09 and 0.4mWW(-2) conversion efficiencies at room temperature, respectively. High terahertz-generation efficiency and relaxed phase-matching conditions offered by the Cherenkov scheme allowed us to demonstrate, for the first time, an external-cavity terahertz quantum cascade laser source tunable between 1.70 and 5.25 THz.