Long-term stability of GaAs/AlAs terahertz quantum-cascade lasers
Long-term stability of GaAs/AlAs terahertz quantum-cascade lasers
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DOI：
10.1063/5.0098782
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发表时间：
2022-08
期刊：
影响因子：
1.6
通讯作者：
L. Schrottke;X. Lü;K. Biermann;P. Gellie;H. Grahn
中科院分区：
文献类型：
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作者：
L. Schrottke;X. Lü;K. Biermann;P. Gellie;H. Grahn
我们研究了高性能GaAs/AlAs太赫兹（THz）量子级联激光器（qcl）的工作参数的长期稳定性。在级联结构下附加一层较厚的AlAs折射率对比层的激光器，其输出功率在三个月后下降约35%。这些激光器的劣化是由于从切面开始的对比层中的氧化过程。然而，具有Al0.9Ga0.1As折射率对比层的GaAs/AlAs太赫兹qcl，即使暴露在大气条件下，也表现出多年来工作参数的长期稳定性。因此，这些激光器是在太赫兹光谱区域具有商业应用前景的高功率辐射源。
We have investigated high-performance GaAs/AlAs terahertz (THz) quantum-cascade lasers (QCLs) with respect to the long-term stability of their operating parameters. The output power of lasers that contain an additional, thick AlAs refractive-index contrast layer underneath the cascade structure decreases after three months by about 35%. The deterioration of these lasers is attributed to the oxidation processes in this contrast layer starting from the facets. However, GaAs/AlAs THz QCLs with an Al0.9Ga0.1As refractive-index contrast layer exhibit long-term stability of the operating parameters over many years even when they are exposed to atmospheric conditions. Therefore, these lasers are promising high-power radiation sources in the terahertz spectral region for commercial applications.