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基于矢量模型,从麦克斯韦方程组出发精确计算了空芯光纤中HE_(11)模的电磁场分布,并分析了电磁场各分量的传播特性。研究表明,HE_(11)模强度沿光纤横截面呈环状分布,电场分量E_r和E_φ相位相同,磁场分量H_r和H_φ相位相反。以~(85)Rb原子为例,当入射激光功率为1 W,失谐量为1 GHz,空芯光纤空心区半径为0.7mm时,计算了空芯光纤中HE_(11)模的绝对强度分布和光学势分布,计算发现空心区最大光学势为14.9 mK,远大于标准磁光阱中~(85)Rb原子温度(120mK),因此空芯光纤中的HE_(11)模可用于导引~(85)Rb原子。空芯光纤原子导引有望应用于原子干涉领域。
Based on the vector model, the electromagnetic field distribution of HE 11 mode in hollow fiber is calculated accurately from the Maxwell equations and the propagation characteristics of each component of the electromagnetic field are analyzed. The results show that the intensity of HE 11 mode is distributed in a ring shape along the fiber cross section. The phases of E_r and E_φ are the same and the phases of H_r and H_φ are opposite. Taking the (85) Rb atom as an example, the absolute intensity of the HE 11 mode in the hollow fiber is calculated when the incident laser power is 1 W, the detuning is 1 GHz and the radius of the hollow core is 0.7 mm. Distribution and optical potential distribution, the maximum optical potential of hollow core is 14.9 mK, which is much larger than the temperature of ~ (85) Rb atom in standard magneto-optical trap (120mK). Therefore, the HE 11 mode in hollow fiber can be used to guide ~ (85) Rb atom. Hollow fiber optic atom guidance is expected to be used in the field of atomic interference.