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中文摘要：
以菲涅耳-基尔霍夫衍射理论为基础,研究高阶贝塞尔光束穿过非线性光学介质的衍射效应,从而解释高阶贝塞尔光束的Z扫描现象.通过对使用高斯光束、零阶贝塞尔光束、一阶贝塞尔光束、二阶贝塞尔光束和三阶贝塞尔光束的归一化Z扫描曲线对比,表明使用高阶贝塞尔光束较使用零阶贝塞尔光束的Z扫描具有更高的灵敏度.高阶贝塞尔光束的Z扫描为测量介质非线性光学系数提供了一种更为精确的测量方法.
英文摘要：
Based on the Fresnel-Kirchhoff diffraction theory,the diffraction effects of high-order Bessel beams through the nonlinear optical media are analyzed,which can explain the Z-scan phenomena of high-order Bessel beams.By comparing the normalized Z-scan transmittances of Gaussian beam,zero-order Bessel beam,first-order Bessel beam,second-order Bessel beam and third-order Bessel beam,it is shown that Z-scan using the high-order Bessel beam has a higher sensitivity than that using the zero-order Bessel beam.The Z-scan with the high-order Bessel beams may provide a precise method for measuring the nonlinear coefficients of optical media.
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