均匀化位相的常规非稳腔的分析与实验

对常规非稳腔的输出镜面进行改造,在原来不透光的中央区域引入增透膜,使之能部分透过,使输出耦合能的比例得到提高;同时加敷适当的位相膜,使中央区与环带区波面位相拉平些.着重报导了均匀化相位常规非稳腔的系列实验和分析,从而使常规非稳腔的环带输出引起的中央不透明区与外环带输出波面的位相突变得到改善,克服了远场能量分布出现较严重离散的问题,使远场中央亮斑能量更集中.

Analysis and experiments of normal type unstable resonators with homogenized phase

There exist phase sudden change of the output laser wave surface between the annular area and the shelter central area in normal type unstable resonators. It would lead to the laser energy divergence seriously in the far field. Specially, the intensity of central disk of far field will then be reduced. We have given it's theory analysis in detailed in ref1]. This paper we emphasize in experimental research of this type of laser resonators with homogenized phase. On the situation of cavity rence transparent radio in laser light from central area have been chosen. All of the experiments are working in a copper vapor laser system with a large aperture. Good agreement results with the theory analysis have obtained. Specially, reducing the far-field divergence angles in 34% as the transparence radio of the laser light near or less then 90% from the central area of the resonator.