包含光阑的激光谐振腔模式

用光线矩阵方法研究了两类带有光阑的谐振腔。对包含软边光阑的腔,从衍射积分方程出发,求出了本征模式的普遍解析解。对包含硬边光阑的腔,用适当孔径的高斯光阑代替实际小孔,得到模式的近似解。用于分析常见的小孔选模腔、自孔径选模腔及包含光阑的热稳腔等,所得结果和实验测量值良好地相符。

Eigenmodes of resonator containing apertures

Using ray-matrix method we investigated the resonators containing two kinds of apertures. For the first one with soft-aperture, a general analysis solution of eigenmodes was derived on the basis of the diffraction integral equation. The relationship between the features of the zero-order mode and size and position of the aperture was investigated. For the second one with hard-aperture, we substituted a Gaussian aperture with suitable diameter for the used aperture, the approximate solution of eigenmode was obtained. The result was used for analysing the mode-selecting resonator with iris, the self-aperture mode-selecting resonator and thermo-insensitive resonator containing a aperture. The theory has been well verified by our experiments.