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提出一种特征值方法用于计算具有流动饱和增益介质的气体激光器的光场分布情况。计算模型中,流动饱和增益介质等效为一个位于激光谐振腔内的大腔镜前面的薄增益片。基于这个模型,可以获得特征值法的传输矩阵。通过求解传输矩阵的特征值与特征向量,能够较容易地获得激光器谐振腔中所有可能存在的光场分布情况,通过比较它们的损耗参数能够获得激光器实际存在的光场分布。模拟计算结果显示:流动饱和增益介质对光场分布具有负面影响,它将导致光场分布沿着气体流动的方向倾斜。该方法的模拟计算结果能够与其它方法的模拟计算结果较好地吻合。
An eigenvalue method is proposed for calculating the light field distribution of a gas laser with a flow-saturated gain medium. In the computational model, the flow-saturated gain medium is equivalent to a thin gain plate located in front of a large cavity mirror inside the laser resonator. Based on this model, the eigenvalue transfer matrix can be obtained. By solving the eigenvalues and eigenvectors of the transfer matrix, it is easy to obtain all possible optical field distributions in the laser resonator. By comparing their loss parameters, the actual optical field distribution of the laser can be obtained. The simulation results show that the flow-saturated gain medium has a negative effect on the light field distribution, which causes the light field distribution to tilt along the gas flow direction. The simulation results of this method are in good agreement with the simulation results of other methods.