横向激励kW级CO_2激光器输出模式分布的数值计算

Numerical Calculation of Field Distribution of kW TEA CO_2 Laser Modes

对圆镜平—凹稳定腔研究表明:用高斯—拉盖尔分布作Fox-Li选代法初始分布,可计算菲涅尔数更大的腔模分布;无论基模还是高阶模,当菲涅尔数大于某一值N_L后,可用标准的高斯—拉盖尔分布描述圆反射镜共焦腔模的场分布。

In this paper, field distribution of output modes of steady cavity of circular plane-concave mirrors with big Fresnel number has been numerically investigated, and the conclusiongiven that by using the Gauss-Le'gare distribution as that of an initially launched wave of theFox-Li iterative approach, field distribution of output modes of cavity with greater Fresnel num-ber than before can be calculated and as long as the Fresnel number is bigger than or equals NL(varing from orders of modes), field distribution, either low-order or high-order mode, can bereplaced by the Gauss-Le'gare one.