EAGER: Spatial and Spectral Beam Control of Angled-Cavity Distributed-Feedback Quantum Cascade Lasers

EAGER：角腔分布式反馈量子级联激光器的空间和光谱光束控制

• 批准号: 1359779
• 负责人: Yanbo Bai
• 金额: $ 18万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-02-15 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1359779&HistoricalAwards=false
• 关键词: EAGER; Spatial; Spectral; Beam; Control

The objective of this research is to investigate the operation principle of a new type of broad-area semiconductor lasers, termed beta-type distributed feedback lasers. The approach involves numerical and experimental investigations of the lateral mode selection mechanism through the angled cavity and the longitudinal mode selection mechanism through the beta-type distributed feedback grating.The intellectual merit of the proposed research is that a deeper understanding about the mode selection mechanism of beta-type distributed feedback will be obtained. The lateral mode selection will be investigated as functions of the cavity tilt angle, ridge width, cavity length, and sidewall verticalness. The longitudinal mode selection will be studied by changing the coupling strength. Finally, the optimal design will be applied to the best quantum cascade gain medium to demonstrate the highest peak power in room temperature single mode operation.The broader impacts of the proposed research stem from the potential that the beta-type distributed feedback laser offers a cost effective approach for power scaling of all types of semiconductor lasers while maintaining excellent beam quality with single mode emission, which offers immense benefit to the society, given the current proliferation of semiconductor lasers in the consumer market. The result of the proposed research activity will be disseminated in peer reviewed journals, professional conferences, and non-technical publications. Some results will also be compiled into classroom materials for both graduate and undergraduate courses.

本研究的目的是探讨一种新型的大面积半导体雷射--β型分布回馈雷射的工作原理。该方法通过数值模拟和实验研究了倾斜腔的横模选择机制和β型分布反馈光栅的纵模选择机制，其理论价值在于加深了对β型分布反馈选模机制的理解。横向模式的选择将被调查的腔倾斜角，脊宽度，腔长，和侧壁垂直度的函数。通过改变耦合强度来研究纵向模式的选择。最后，最佳设计将应用于最佳量子级联增益介质，以证明在室温单模操作中的最高峰值功率。拟议研究的更广泛影响源于β型分布反馈激光器为所有类型的半导体激光器的功率缩放提供了一种具有成本效益的方法，同时保持单模发射的优良光束质量，考虑到当前消费者市场中半导体激光器的激增，这为社会提供了巨大的益处。拟议研究活动的结果将在同行评审期刊、专业会议和非技术出版物上传播。一些结果也将被编入研究生和本科生课程的课堂材料。