Injection locking of mid‐infrared quantum cascade laser at 14 GHz, by direct microwave modulation
Injection locking of mid‐infrared quantum cascade laser at 14 GHz, by direct microwave modulation
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DOI：
10.1002/lpor.201300189
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发表时间：
2014-05
影响因子：
11
通讯作者：
M. St‐Jean;M. Amanti;A. Bernard;A. Calvar;A. Bismuto;E. Gini;M. Beck;J. Faist;H. Liu;C. Sirtori
中科院分区：
文献类型：
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作者：
M. St‐Jean;M. Amanti;A. Bernard;A. Calvar;A. Bismuto;E. Gini;M. Beck;J. Faist;H. Liu;C. Sirtori
工作在中红外波段的小型激光光源在光谱学和无线通信等领域有着重要的应用。量子级联激光器（QCL）是覆盖中红外频率范围的独特半导体光源。基于子带间跃迁，这些源的载流子寿命在ps范围内。因此，它们对直接调制的频率响应有望克服标准半导体激光器的限制。本文报道了9 μm发射的QCL的往返频率的注入锁定。模间激光频率分离由外部微波源稳定和控制。设计了一种嵌入微带线中的光波导，其直接调制的平坦频率响应可达14 GHz。在13.7 GHz的MHz频率范围内的注入锁定证明。注入锁定理论的数值解进行了讨论，并提出作为工具来描述实验结果。
Compact laser sources operating in mid infrared spectral region with stable emission are important for applications in spectroscopy and wireless communication. Quantum cascade lasers (QCL) are unique semiconductor sources covering mid infrared frequency range. Based on intersubband transitions, the carrier lifetime of these sources is in the ps range. For this reason their frequency response to direct modulation is expected to overcome the limits of standard semiconductor lasers. In this work injection locking of the roundtrip frequency of a QCL emitting at 9 μm is reported. Inter modes laser frequency separation is stabilized and controlled by an external microwave source. Designing an optical waveguide embedded in a microstrip line a flat frequency response to direct modulation up to 14 GHz is presented. Injection locking over MHz frequency range at 13.7 GHz is demonstrated. Numerical solutions of injection locking theory are discussed and presented as tool to describe experimental results.