原子介质中实现移动光子晶体的驻波场特性研究  

Standing Wave Field for Preparation of Moving Photonic Crystal in Atomic Medium

作　　者：武晋泽[1] 王丹[1] 郭苗军 周海涛[1] 张俊香[1] 

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,山西太原030006

出　　处：《中国激光》2015年第4期330-338,共9页Chinese Journal of Lasers

摘　　要：讨论了在合成该移动驻波场时,叠加场的具体实验参数对驻波场光场分布和移动速度的影响。给出了驻波场的平均移动速度随两束行波场的频率差和振幅比的变化关系。针对具体实验,分析了两高斯光束夹角和远场发散角对驻波场光场分布的影响。因此实验中为制备较好的光子晶体,需通过光学器件整形得到具有较好光斑质量和较小远场发散角的光束后,使两束功率相等且腰斑重合的光束叠加。The dependence of field distribution and moving velocity of superposed standing-wave on the experimental parameters of two superposing travelling fields is discussed. The phenomenon that moving velocity is highly dependent on the frequency difference and the ratio of amplitudes of two travelling fields is shown. Considering the experimental situation, the effect of the angle between the two beams and the respective far- field divergence angle on standing-wave field distribution is analyzed. A good photonic crystal can be prepared experimentally by superposing two Gaussian beams with good laser spots, small far-field divergence angles which can be obtained by optical shaping device and same powers, and the waists of the two beams should be overlapped. Key words nonlinear optics; photonic crystal; standing wave; Gaussian beam; far-field divergence angle

关 键 词：非线性光学 光子晶体 驻波场 高斯光束 远场发散角 

分 类 号：O437.4[机械工程—光学工程]