非稳腔中不同小信号增益系数的光场模式模拟计算

Numerical Simulation of Optical Field Mode under Different Small Signal Gain in Unstable Resonator

利用角谱传播理论和薄层增益近似的方法,针对不同小信号增益系数的增益介质,在MATLAB平台上计算了正支虚共焦非稳腔的光场模式,分别得到了高斯型、沿x方向高斯型、沿x方向偏光轴高斯型的光场的相位分布和振幅分布。计算结果表明,增益介质的小信号增益系数的分布对光场的强度分布有决定性的影响。

Using angular spectrum propagation theory and thin gain approximation method, for the gain medi-um with different small signal gain coefficient, the positive branch confocal unstable resonator optical field mode iscalculated on MATLAB platform. The phase and amplitude distribution of optical fields such as Gaussian type,Gaussian type along X direction and polarizing axis Gaussian type along X direction are obtained. Calculation re-sults show that the distribution of the small signal gain coefficient of the gain medium has a decisive influence onthe intensity distribution of the optical field.