排序方式: 共有52条查询结果,搜索用时 15 毫秒
41.
42.
半导体条形DH激光器中本征自脉动的精确理论 总被引:1,自引:0,他引:1
本文采用从实际电极等位体出发而不人为假设任何回定形式的注人电流分布的精确理论描述,进一步探讨了具有非自经波导的半导体条形D8激光瞩产生本征国脉动的物理机制及其内外因素的影响.指出偏置和外加电极电压上升时间对自脉动过程有巨大作用,并得出更愉确的自脉动区(出现自脉动的电压电流范回入 相似文献
43.
提出考虑到载流子侧向扩散分布以及光场模式分布精确描述具有非自建增益波导的电极条形双区共腔半导体双稳态激光器中物理过程的理论模型,从外加电极等势体出发对所涉及各种分布,不作任何人为假设,自洽地计算分析了半导体激光双稳态的静态特性和开关过程,并与现行集中均匀近似假设的计算结果进行比较,并指出其局限性。发现载流子侧向扩散分布和光场模式分布及其相互作用使激射阈值电流显著提高,双稳区宽度减小,开关时间加长。指出采用自建拆射率波导结构可明显改进双稳态性能。 相似文献
44.
45.
46.
47.
49.
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
![点击此处可从《中国物理》网站下载免费的PDF全文](/ch/ext_images/free.gif)
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
50.
折射率缓变波导层分别限制单量子阱半导体激光器的模式分析 总被引:1,自引:0,他引:1
本文提出一种能够精确分析波导层具有任意折射率分布而且收敛性好的分层逼近迭代法,研究了折射率缓变波导层分别限制单量子阱(GRIN-SCH-SQW)中波导层的折射率分布对近场分布,近场束宽,光限制因子,远场分布,远场角,激射阈值的作用,并与延伸抛物型近似解和折射率突变波导层分别限制单量子阱半导体激光器进行较全面的比较.结果表明:延伸抛物型近似不宜普遍采用;采用适当的缓变波导层可进一步降低阈值(例如采用抛物型或线性分布),或进一步减小远场角(例如采用倒抛物型分布). 相似文献