边带
量子级联激光器
光学
光电子学
级联
激光阈值
材料科学
激光器
半导体激光器理论
调幅
微波食品加热
频率调制
物理
无线电频率
电信
色谱法
量子力学
计算机科学
化学
作者
Borislav Hinkov,Andreas Hugi,Mattias Beck,Jérôme Faist
出处
期刊:Optics Express
[The Optical Society]
日期:2016-02-09
卷期号:24 (4): 3294-3294
被引量:45
摘要
We present the electrical and optical characterization and theoretical modeling of the transient behavior of regular 4.5-μm single-mode emitting distributed feedback (DFB) quantum cascade lasers (QCLs). Low residual capacitance together with a high-frequency optimized three-terminal coplanar waveguide configuration leads to modulation frequencies up to 23.5 GHz (optical) and 26.5 GHz (electrical), respectively. A maximum 3-dB cut-off value of 6.6 GHz in a microwave rectification scheme is obtained, with a significant increase in electrical modulation bandwidth when increasing the DC-current for the entire current range of the devices. Optical measurements by means of FTIR-spectroscopy and a heterodyne beating experiment reveal the presence of a resonance peak, due to coupling of the lasing DFB- with its neighboring below-threshold Fabry-Pérot-(FP-)mode, when modulating around the cavity roundtrip frequency. This resonance is modeled by a 2-mode Maxwell-Bloch formalism. It enhances only one sideband and consequently leads to the first experimental observation of the single-sideband regime in such kind of devices.
科研通智能强力驱动
Strongly Powered by AbleSci AI