同轴放电环形增益区谐振腔镜面的场分布

 对几类环形增益区谐振腔进行了比较，得出利用谐振腔两镜之一的全工作面输出的新型环形增益区谐振腔是适合的谐振腔。提出了一种计算全工作面输出的同轴放电环形增益区谐振腔镜面场分布的方法，利用几何方法对腔镜镜面进行划分,得出了基于菲涅尔-基尔霍夫衍射积分定理的积分区域，并对该区域进行了有限元划分，应用计算机编程计算出了同轴放电环形增益区谐振腔镜面处的光场分布和相位分布。近场分布在环形区中央部分近似地呈高斯分布，且沿径向出现高阶模场分布特点，沿角向无差别。

Optic field distribution at the mirror of annular resonator of coaxial discharge

Comparing several kinds of resonators with annular gain media,the new type of multipass resonator with two annular spherical mirrors which uses an entire working surface output is considered suitable for a kind of high power CO2 laser.A new method for calculating the optic field distribution at the mirror of coaxial discharge laser with annular gain media is proposed.An integral area is obtained using solid geometry based on Fresnel-Kirchoff diffractive integral equation,which is divided into finite grids.Then the optic field distribution at the mirror of annular resonator is calculated.Near-field distribution in the middle of the annular area is similar to the Gaussian distribution,and the high-order mode distribution appears along the radius.Azimuthal distribution has no discrimination.