Experimental investigation of terahertz quantum cascade laser with variable barrier heights
Experimental investigation of terahertz quantum cascade laser with variable barrier heights
复制标题
DOI：
10.1063/1.4873461
复制
发表时间：
2014-04
影响因子：
3.2
通讯作者：
A. Jiang;A. Màtyàs;K. Vijayraghavan;C. Jirauschek;Z. Wasilewski;M. Belkin
中科院分区：
文献类型：
--
作者：
A. Jiang;A. Màtyàs;K. Vijayraghavan;C. Jirauschek;Z. Wasilewski;M. Belkin
报道了基于Al xGa 1-xAs/GaAs材料系统的变势垒高度太赫兹量子级联激光器的实验研究。基于半经典系综MonteCarlo模拟，以最先进的Al0.15Ga0.85As/GaAs三量子阱共振声子减少有源区设计为参考，提出了两种新的设计方案.新设计实现了188 K和172 K的最高激光温度，而参考结构的最高激光温度为191 K。这些结果表明，具有可变势垒高度的太赫兹量子级联激光器设计提供了一种可行的替代传统的有源区设计与固定的势垒成分。通过使用可变屏障提供的额外设计空间可能会导致未来太赫兹量子级联激光器性能的改进。
We report an experimental study of terahertz quantum cascade lasers with variable barrier heights based on the Al xGa1–xAs/GaAs material system. Two new designs are developed based on semiclassical ensemble Monte Carlo simulations using state-of-the-art Al 0.15Ga0.85As/GaAs three-quantum-well resonant phonon depopulation active region design as a reference. The new designs achieved maximum lasing temperatures of 188 K and 172 K, as compared to the maximum lasing temperature of 191 K for the reference structure. These results demonstrate that terahertz quantum cascade laser designs with variable barrier heights provide a viable alternative to the traditional active region designs with fixed barrier composition. Additional design space offered by using variable barriers may lead to future improvements in the terahertz quantum cascade laser performance.