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Quantum Theory Explanation of Helicity Inversion of laser(Photons) During Reflection

Journal of Southwest Jiaotong University(English Edition) 2007年第1期15卷 84-87页

作者：姜向东郭开惠 School of Science Southwest Jiaotong University Chengdu 610031 ChinaSchool of Science Southwest Jiaotong UniversityChengdu 610031 China

Theretical analysis of the helicity inversion of laser （photons） during reflection is made by quantum theory for laser （photons） through an optical helix. The result reveals that the helicity inversion of the laser （photons） occurs when the wave vector of the laser （photon） rotates at an extremely high angular velocity. The dynamic factor that dominates the process is the Coriolis coupling between the spin of the photon and the rotation of the wave vector. This non-intertial effect is treated successfully by simplification of the Maxwell equation in the rotational frame. In addition, the implication of the helicity inversion in information theory is discussed.

关键词： Quanturm theory Helicity inversion laser physics Photons

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Threshold behavior of defect modes in one-dimensional active photonic crystal

Threshold behavior of defect modes in one-dimensional active...

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2007年中国青年光学学术研讨会

作者： Wang Hong~(a,b) Ouyang Zheng biao~(*a) Han Yanling~(c,d) ~aCenter of THz Technology of Shenzhen University,College of Engineering and Technology,Shenzhen University, Shenzhen 518060,China ~bUniversity of Electronic Science and Technology of China,School of Physical Electronics,Chengdu 100718,China ~cState Education Commission Laboratory for Image Processing & Intelligent Control,Institute of Artificial Intelligence,Huazhong University of Science & Technology,Wuhan 430074,China ~dphysics Department of China University of Geosciences,Wuhan 430074,China

＜正＞Based on a model of coupling Maxwell’s equations with the rate equations of electronic population,the spatial-distribution and spectrum-characteristics as well as amplified properties of defect modes such as lasing threshold,saturated output in a single-defect active photonic crystal are investigated through finite-difference time-domain *** of the number of crystal periods and spatial profile on amplified feature are also *** results show that the lasing threshold and saturated output depend directly on the number of crystal periods and the spatial profile of defect modes;the defect mode with lower mode area has a ***,the lasing threshold can be further reduced as the saturated output increases if the number of crystal periods *** a feature is important for understanding of the interaction between optical gain and defect modes.

关键词： laser physics photonic crystal laser finite-difference time-domain method defect mode

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