【摘要】 利用菲涅尔—基尔霍夫衍射积分公式,研究薄片近似情况下的Kerr效应带来的波前畸变对高斯光束聚焦特性的影响·在相位延迟为-2~2rad的范围内进行的模拟计算表明:正Kerr效应能提高高斯光束的聚焦强度、增大相对焦移量、提高聚焦光束的焦平面桶中功率和降低几何焦平面的峰值光强;而负Kerr效应,则会降低聚焦强度、增大相对焦移量、降低聚焦光束的焦平面桶中功率和几何焦平面的峰值光强·可以通过增大光束菲涅尔数来抑制Kerr效应对聚焦特性的影响·更多还原

【Abstract】 Based on the Fresnel-Kirchhoff diffraction theory,the focusing property of the Gaussian beam transmitted through the thin Kerr medium is studied.The simulation for the phase-delay ranging from to is made,and the results show that,for medium with positive nonlinear refraction index,the Kerr effects of the beam may improve the focused peak intensity and the PIB on the focal plane, enlarge the relative focal shift and reduce the peak intensity on the geometry focal plane;but for negative index medium,it will reduce the focused peak intensity and its PIB on the focal plane,but other properties of the focusing remain the same as the positive one.And the influence of the Kerr effects on the focusing property can be reduced by enlarging the Fresnel number of the Gaussian beams.更多还原