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首页> 外文期刊>IEEE Journal of Quantum Electronics >Spatially Resolved Femtosecond Pump–Probe Spectroscopy in Broad-Area Semiconductor Lasers
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Spatially Resolved Femtosecond Pump–Probe Spectroscopy in Broad-Area Semiconductor Lasers

机译：广域半导体激光器中的空间分辨飞秒泵浦-探针光谱

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摘要

We investigate the ultrafast gain dynamics in broad-area semiconductor lasers with particular emphasis on spatial and spatiotemporal effects. We present a spatially resolved femtosecond pump–probe experiment which allows us to measure the compression and recovery of the gain with 250-fs temporal and 15$muhbox m$spatial resolution. We find a significant spatial variation of the gain recovery time across the lateral laser coordinate indicating an influence of the extended laser structure on the ultrafast carrier relaxation. Moreover, we are able to follow the spatiotemporal relaxation of the ultrafast spatiospectral gain saturation within the extended semiconductor active area. We find diffusion-like broadening of the locally suppressed gain on two distinct ultrafast timescales, within several picoseconds and several tens of picoseconds, resulting from an interplay between intraband relaxation, spatial holeburning, and light propagation. Supported by microscopic modeling, our results provide insight into the different mechanisms and timescales associated with the spatiotemporal carrier dynamics. These findings are essential for the design of laterally extended semiconductor active devices for ultrafast optical signal processing applications.
机译：我们研究广域半导体激光器中的超快增益动力学，尤其着重于空间和时空效应。我们提出了一个空间分辨的飞秒泵浦-探针实验，该实验使我们能够以250 fs的时间和15 $ muhbox m $空间分辨率测量增益的压缩和恢复。我们发现横向激光坐标上增益恢复时间的显着空间变化，表明扩展的激光结构对超快载流子弛豫的影响。此外，我们能够在扩展的半导体有源区域内跟踪超快时空光谱增益饱和的时空弛豫。我们发现，由于带内弛豫，空间空穴燃烧和光传播之间的相互作用，在两个不同的超快时间尺度上，在几个皮秒和几十皮秒内，局部抑制增益的扩散状加宽。在微观建模的支持下，我们的结果提供了与时空载流子动力学相关的不同机制和时标的见解。这些发现对于设计用于超快光信号处理应用的横向扩展半导体有源器件至关重要。

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