机构

• 广州地球化学研究所 [1]
• 长春光学精密机械与物... [1]

采集方式

• OAI收割 [2]

内容类型

• 会议论文 [1]
• 期刊论文 [1]

发表日期

• 2024 [1]
• 2010 [1]

学科主题

筛选

浏览/检索结果: 共2条，第1-2条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Genetically linked litho- and organo-facies in meter-scale cycles of lacustrine deposits within the Permian Lucaogou Formation in the Bogda Mountains, Northwest China: Implications for paleoenvironment and organic matter origin 期刊论文  OAI收割 GEOENERGY SCIENCE AND ENGINEERING, 2024, 卷号: 240, 页码: 21 作者:  Zhan, Xin;  Yang, Wan;  Feng, Qiao;  Zhan, Zhao-Wen;  Wei, Sile   |  收藏  |  浏览/下载：11/0  |  提交时间：2024/09/13 Lacustrine system  High-order cycles  Lithofacies and organofacies  Cyclostratigraphy  Chemostratigraphy  Biomarkers   Theoretical analysis of emission characteristics of second-order distributed feedback semiconductor lasers (EI CONFERENCE) 会议论文  OAI收割 Semiconductor Lasers and Applications IV, October 18, 2010 - October 19, 2010, Beijing, China 作者:  Liu Y.;  Liu Y.;  Qin L.;  Liu Y.;  Wang L. 收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25 Based on the modified coupled-wave theory  the emission characteristics  including threshold gain  photon density distribution in the cavity  and external differential quantum efficiency for second-order DFB lasers are investigated. Numerical simulation results show that for given device structure with wavelength of 1.55 m  the feedback coupling coefficient and the surface radiation coupling coefficient of the second-order grating have great influence on the emission characteristics of the device. By choosing different duty cycles of the grating  we can change the two coupling coefficients  which affect the emission characteristics. For an overall consideration  an optimal duty cycle of 0.43 is chosen. The optimized results show that the device works without degeneracy modes and spatial burning hole. Besides  the side-mode suppress ratio (SMSR) and external differential quantum efficiency reach as high as 42 dB and 47%  respectively. 2010 SPIE.