Ultrafast harmonic mode-locking of monolithic compound-cavity laser diodes incorporating photonic-bandgap reflectors
Ultrafast harmonic mode-locking of monolithic compound-cavity laser diodes incorporating photonic-bandgap reflectors
复制标题
结合光子带隙反射器的单片复合腔激光二极管的超快谐波锁模
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
E. Avrutin
中科院分区：
文献类型：
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作者：
D. Yanson;M. W. Street;S. McDougall;I. Thayne;J. Marsh;E. Avrutin
我们首次展示了单片半导体激光器的新颖设计的可再现谐波锁模操作，该激光器包括由一维光子带隙（PBG）镜形成的复合腔。锁模是在基本往返频率的谐波下实现的，脉冲重复率从 131 GHz 到创纪录的高频率 2.1 THz。该器件由 GaAs/AlGaAs 材料制成，发射波长为 860 nm，并包含两个增益部分（其间有一个蚀刻的 PBG 反射器）和一个可饱和吸收器部分。报告了自相关研究，可以分析不同锁模频率、复合腔比以及腔内反射器的类型和数量的器件行为。高反射 PBG 微结构对于高频器件的无次谐波锁模操作至关重要。我们还证明了多槽 PBG 反射器可以用两个反射率较小的独立槽代替。这些激光器可能在太赫兹成像、医学、超快光链路和大气传感等领域得到应用。
We present the first demonstration of reproducible harmonic modelocked operation from a novel design of monolithic semiconductor laser comprising a compound cavity formed by a 1-D photonic-bandgap (PBG) mirror. Modelocking is achieved at a harmonic of the fundamental round-trip frequency with pulse repetition rates from 131 GHz up to a record high frequency of 2.1 THz. The devices are fabricated from GaAs/AlGaAs material emitting at a wavelength of 860 nm and incorporate two gain sections with an etched PBG reflector between them, and a saturable absorber section. Autocorrelation studies are reported, which allow the device behaviour for different modelocking frequencies, compound cavity ratios, and type and number of intra-cavity reflectors to be analyzed. The highly reflective PBG microstructures are shown to be essential for subharmonic-free modelocking operation of the high-frequency devices. We have also demonstrated that the multi-slot PBG reflector can be replaced by two separate slots with smaller reflectivity. These lasers may find applications in terahertz imaging, medicine, ultrafast optical links, and atmospheric sensing.