High-Frequency Self-Modulation in Short-External-Cavity VCSEL with Concave Mirror
High-Frequency Self-Modulation in Short-External-Cavity VCSEL with Concave Mirror
复制标题
带凹面镜的短外腔 VCSEL 的高频自调制
DOI：
10.1109/lpt.2014.2368582
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发表时间：
2015
影响因子：
2.6
通讯作者：
and H. Kawaguchi
中科院分区：
文献类型：
--
作者：
T. Liu;T. Katayama;and H. Kawaguchi
我们观察了一种新型短外腔垂直腔面发射激光器的高频调制光输出。采用短半径凹面镜作为腔体的一端，在腔体内采用薄膜四分之一波片，减小了腔体的长度L。利用半径为20 mm的凹面镜，产生了重复频率为~3.5 GHz的基于偏振自调制的脉冲序列。当半径缩短到5.08 mm时，产生了频率为~12.6 GHz的正弦调制。当驱动电流变化时，在离散电流值处观察到调制频率和极化方向周期性变化的稳定调制序列。我们发现，两个外腔模式，相距近c/4L，选择性振荡，它们的拍频导致输出调制。
We observed high-frequency modulation of optical output from a short-external-cavity vertical-cavity surface-emitting laser with a new configuration. The length L of the external cavity was reduced using a short-radius concave mirror as one end of the cavity and using a thin-film quarter-wave plate in the cavity. With a concave mirror having a radius of 20 mm, a pulse sequence based on the well-known polarization self-modulation and having a repetition rate of ~3.5 GHz was generated. When the radius was shortened to 5.08 mm, a sinusoidal modulation with a frequency of ~12.6 GHz was generated. With changing drive current, stable modulation sequences with periodic changes in the modulation frequency and polarization direction were observed at discrete current values. We found that two external-cavity modes, which were separated by nearly c/4L, selectively oscillated and the beat of them resulted in modulation of the output.