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基于光线传输矩阵理论,研究了含特异材料环形腔内光波光斑半径和相对光强的分布特性。结果表明:以负折射率材料内部作为起始位置,光波传输一周后,子午面和弧矢面光斑半径均较大,中心光强较弱。当光波离开负材料后,光斑半径迅速减小,由于凹面镜的影响,在其表面又达到极大值,但较负材料内部光斑半径小很多。当光波传输起始点远离凹面镜后,光斑半径依次减小,在两平面镜中心达到最小值,此时中心光强最大。在此基础上,分析了负材料长度和介质折射率对光波束腰半径的影响。研究发现,介质长度对环形腔内子午面和弧矢面的束腰半径影响较小,但介质折射率对负材料内部束腰半径的影响较大。
Based on the theory of light transmission matrix, the distribution characteristics of light spot radius and relative light intensity in annular cavity with different materials were studied. The results show that the inner radius of the meridian and sagittal plane is larger and the center is weaker. When the light wave leaves the negative material, the radius of the spot decreases rapidly. Due to the influence of the concave mirror, it reaches the maximum value again on the surface, but the spot radius of the negative material is much smaller than that of the negative material. When the starting point of light wave transmission away from the concave mirror, the spot radius in turn decreases in the two plane mirror center to reach the minimum, this time the center of the light intensity. On this basis, the influence of negative material length and medium refractive index on the beam waist radius is analyzed. The results show that the length of media has little influence on the waist radius of meridian and sagittal plane, but the influence of medium refractive index on the waist radius of the negative material is larger.