Results show that if the cross-section of the axicon is ideally manufactured in circularsymmetry, the field distribution behind the axicon is approximately an ideal Bessel beam.
计算结果指出，当轴棱锥的截面为圆对称的理想加工时，轴棱锥产生的光场分布为近似理想的零阶贝塞耳光。
2
Based on symmetry of the circular light spot of the laser, a two dimensional numerical simulation of temperature fields of laser molten pool has been developed.
利用激光圆形光斑对称性的特点，建立了激光表面快速熔凝条件下温度场的二维数值模型。
3
According to the symmetry of the circular array, the algorithm for solving the general impedance matrix assignment of MOM is presented to save computational time.