非链式DF激光器非稳腔数值仿真与实验

发布时间：2018-07-24 20:53

【摘要】：基于描述光束传播的菲涅耳-基尔霍夫衍射积分理论,运用快速傅里叶变换算法仿真了非稳腔DF激光的三维近场、远场光强分布。仿真结果显示:非稳腔的近场输出光斑形状为中心对称的空心圆环,远场输出光斑为具有中心亮斑的多级衍射环;大M数将导致近场光斑能量集中,大的Neq值将引起远场发散角变大。运用该算法研究了腔镜倾斜对近场光强分布的影响:腔镜倾斜使光束近场分布变差,倾斜角越大,光强的非对称分布越明显。开展了非链式DF激光器非稳腔实验研究,实验得到的近场、远场光强分布及腔镜失调下的近场光斑变化情况与数值模拟结果一致,实验测量的远场发散角为1.2 mrad。文中的仿真结果可为DF激光器腔镜失调诊断及调节提供依据。
[Abstract]:Based on the Fresnel Kirchhoff diffraction integral theory which describes the beam propagation, the 3-D near-field and far-field intensity distributions of DF laser with unstable resonator are simulated by using the fast Fourier transform (FFT) algorithm. The simulation results show that the near field output spot of unstable cavity is a hollow ring with center symmetry, the far field output spot is a multistage diffraction ring with central bright spot, and the large M number will lead to the energy concentration of near field spot. A large Neq value will cause the divergence angle of the far field to increase. The effect of mirror tilt on the intensity distribution of near-field light is studied by using this algorithm. The skew of mirror makes the distribution of near-field light worse, and the larger the tilt angle, the more obvious the asymmetric distribution of light intensity. The experimental study of unsteady resonator of non-chained DF laser is carried out. The experimental results of near-field, far-field intensity distribution and near-field spot variation under mirror misalignment are in agreement with the numerical simulation results. The measured far-field divergence angle is 1.2 mrad. The simulation results in this paper can provide the basis for the diagnosis and adjustment of the mirror misalignment of DF laser.
【作者单位】：吉林师范大学信息技术学院;中国科学院长春光学精密机械与物理研究所;
【基金】：科技部国际合作专项基金(2011DFR10320) 吉林省科技发展计划项目(20160520019JH) 激光与物质相互作用国家重点实验室自主基金(SKLLIM1510)
【分类号】：TN248

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