非傍轴矢量衍射光束的能量传输

为了研究平面波经微小孔衍射的能量集中度,运用严格的矢量衍射理论以及非傍轴光束横截面上光强的精确表示和功率密度表示,进行了详细的数值计算和比较研究。研究结果表明,衍射光束的能量集中度与传输距离、衍射孔径、光斑半径等参量有关,通过对光学系统参量的控制,可得到合适的能量集中度。这些结果对光纤探针能量传输特性的研究具有重要意义。

Energy transmission of nonparaxial vector diffraction beam

In order to study the energy focus ability of the beam diffracted by a small circular aperture,based on the rigorous vectorial diffraction theory and the accurate expression of light intensity,the power density expression of nonparaxial diffraction beam at the transverse plane,detailed numerical calculation was performed and the different results were compared.It showed that the energy focusability of the diffraction beam depended on the transmission distance,diffraction aperture and facula radius,and appropriate energy focusability could be obtained by controlling some parameters of the optical system.The results have some reference values to the research of energy transmission of the fiber probe.