级联
垂直腔面发射激光器
光电子学
量子点激光器
激光器
材料科学
量子隧道
量子点
光学
带宽(计算)
量子级联激光器
半导体激光器理论
边坡效率
量子阱
物理
波长
光纤激光器
计算机科学
电信
色谱法
化学
作者
Mohammad Mohsen Sheikhey,Ali Mahjoory,Hamed Baghban,Saeed Golmohammadi
出处
期刊:Applied Optics
[The Optical Society]
日期:2022-02-16
卷期号:61 (6): 1523-1523
被引量:5
摘要
Quantum cascade lasers with quantum dot (QD) active regions have been developed to overcome the drawbacks of quantum-well-based cascade lasers. Low threshold current and enhanced bandwidth characteristics of QD lasers can be combined with promising energy-efficient features of vertical cavity surface emitting lasers (VCSELs) through introducing the novel, to the best of our knowledge, concept of a QD cascade VCSEL (QDC-VCSEL). Design steps and predicted features of a QDC-VCSEL operating at 4.5 µm wavelength are discussed in this paper, where the cavity and active region are optimized for TE mode using a high contrast grating design. Laser characteristics are investigated by developing rate equations for the cascade scheme. Threshold and L-I characteristics are obtained at different temperatures. Also, the dependency of threshold current, slope efficiency, and modulation bandwidth on design parameters, mainly the carrier tunneling time, is studied. Results exhibit output peak powers of ∼2 and ∼0.5mW at 150 and 273 K, respectively. In addition, threshold current increment and modulation bandwidth reduction are observed with the increase in tunneling time.
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