射频激励板条波导CO_2激光器远场空间压缩单峰输出模式的研究

RF-excited slab waveguide CO_2 laser with the far field intensity distribution of a single suppressed peak

从研究射频激励板条波导 CO2 激光器远场压窄单峰的理论成因出发 ,根据实验现象 ,通过理论分析和数值计算得出宽波导平平腔自再现模 ,这种自再现模式与无波导壁时不同 ,其近场具有复杂分布 ,理论分析表明求出这种模式的远场是压窄单峰强度分布 。

This paper theoretically studied the properties of the mode structure and modes evolution of a slab waveguide CO 2 laser with a far field intensity distribution of a single spatially suppressed peak. To well explain the experimental result, physical model based on the Diffractive Optics was proposed in this paper. A self consistent mode equation under condition of waveguide wall was set up. By the use of the numerical method, the self consistent mode was solved under the condition of waveguide wall. The theoretical results show that the farfield of the mode is single peak while its nearfield is a multiple spots. These theoretical results well agree with the obtained experimental result.