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中文摘要：
利用高斯光束的ABCD定律、q参数定义及高斯光束的表征和介质传输矩阵三种方法，计算得出腔内插入折射率为η的透明介质，不改变高斯光束聚焦后的腰斑大小，只改变焦斑位置，且插入的透明介质相当于长度为η^-D的真空。
英文摘要：
Three methods were used to calculate the changes of focus parameter when a transparent medium with refractive index η was inserted in the laser cavity. The results show that the beam waist size and the focus depth were not changed; on the contrary, the position of the beam waist was moved. The inserted transparent medium is just equal to vacuum with length D/η
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