激光阈值
拓扑(电路)
绝热过程
激光器
模式(计算机接口)
物理
国家(计算机科学)
作者
A. Schumer,Yuzhou G. N. Liu,J. Leshin,L. Ding,Yousef Alahmadi,Absar U. Hassan,H. Nasari,Stefan Rotter,Demetrios N. Christodoulides,P. LiKamWa,Mercedeh Khajavikhan
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2022-02-25
卷期号:375 (6583): 884-888
标识
DOI:10.1126/science.abl6571
摘要
Shaping the light emission characteristics of laser systems is of great importance in various areas of science and technology. In a typical lasing arrangement, the spatial profile of the mode tends to remain self-similar throughout the cavity. Here, we introduce a paradigm shift where a spatially evolving mode is faithfully settled into a pair of bi-orthogonal states at the two facets of a laser cavity. This is achieved by deliberately eliminating non-adiabatic jumps in a purposely designed structure that features a dynamic encirclement of a non-Hermitian exceptional point. The resulting state transfer reflects the unique topology of the associated Riemann surfaces. Our approach provides a route to develop versatile mode selective active
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