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本文从理论上分析了稳态和瞬态情况半导体自发发射光谱峰值与载流子在能带中的分布极大值之间的关系;载流子分布极大值位于带尾中的条件;载流子分布极大值在带尾中随注入水平变化的快慢与带尾形状以及载流子是否达到准平衡分布的关系。建立了从稳态和瞬态发射光谱的峰值移动规律定量地确定带尾态密度分布的新方法,并得出了在掺双性硅的GaAs,自发发光的瞬态过程中不存在准费米能级的重要结论。实验上系统地测量了掺有不同杂质、不同掺杂浓度和补偿度的GaAs同质结和异质结样品在不同注入水平下在300K和77K的稳态和瞬态时间分辨光谱。实验结果与理论预期相当符合,并据此探讨了带尾对发光瞬态响应时间的影响。 相似文献
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WHISPERING-GALLERY MODE STRUCTURE IN SEMICONDUCTOR MICRODISK LASERS AND CONTROL OF THE SPONTANEOUS EMISSION FACTOR 总被引:1,自引:0,他引:1 下载免费PDF全文
The mode density and cross-sectional area of whispering-gallery modes of various possible polarizations existing in a microdisk cavity structure have been investigated and compared in some detail. Their variations with the disk thickness and radius have been calculated and the behavior of the spontaneous emission factor controlled by the microdisk structure have been shown. It is found that for a given microdisk thickness, the spontaneous emission factor increases with decreasing microdisk radius, but decreases after passing a maximum value, This non-monotonic behavior has never been noted before by others. The variation of spontaneous emission factor with respect to microdisk thickness also exhibits similar behavior. For a microdisk laser emitting at 1.5 μm wavelength, the enhanced spontaneous emiasion factor can barely exceed 0.2. A device configuration for improving the coupling between the whispering-gallery mode and the active region, and for leading the laser beam out of this high-Q microcavity is proposad, and its feasibility in realizing a thresholdless laser is discussed. 相似文献