设计了一种新型锥台贝塞尔谐振腔,通过汉克尔波理论分析其产生贝塞尔波束的原理,利用几何光学估算其出现在传播轴上的区域。为了克服谐振腔因尺寸问题引起波束发散不聚束,可通过调节其传播方向加以解决。使用并矢格林函数作为迭代方程计算腔内的三维自再现模,通过太赫兹频段的数值模拟,对比其在平面镜上的场强分布及半高宽,验证了贝塞尔束聚焦的结论。产生的贝塞尔波束具有潜在的广泛应用前景。 A new frustum Bezier resonator is designed. Based on Hankel theory, the principle of Bezier beam generation is analyzed, and the geometrical optics is used to estimate the area appearing on the propagation axis. In order to overcome the problem of the size of the resonant cavity beam divergence caused by the beam can be adjusted by adjusting the direction of its transmission to be resolved. The dyadic Green’s function is used as the iterative equation to calculate the three-dimensional self-reproducing mode of the cavity. The terahertz frequency band numerical simulation is used to compare the field intensity distribution and FWHM of the plane mirror. The resulting Bessel beam has potential for wide application.