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.
作者
武晋泽
王丹
郭苗军
周海涛
张俊香
Wu Jinze;Wang Dan;Guo Miaojun;Zhou Haitao;Zhang Junxiang(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan,Shanxi 030006,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2015年第4期330-338,共9页
Chinese Journal of Lasers
关键词
非线性光学
光子晶体
驻波场
高斯光束
远场发散角
nonlinear optics
photonic crystal
standing wave
Gaussian beam
far-field divergence angle
