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中文摘要：
无衍射贝塞尔（Bessel）光束在湍流大气中传输时受到的扰动较小，因此适合于大尺寸准直测量。为了克服传统轴棱锥产生较短无衍射距离的局限，基于传统正、负轴棱锥的光传输特性，提出了两种用于产生长距离无衍射贝塞尔光束的组合轴棱锥。利用光线追迹法和衍射理论模拟了组合轴棱锥的光传输特性。结果表明，两种组合轴棱锥的光传输特性与传统正轴棱锥等效，且能够产生高质量的长距离无衍射贝塞尔光束，而且降低了元件的加工难度。
英文摘要：
Nondiffracting Bessel beam is less disturbanced when propagating in the atmosphere. It＇s very suitable for alignment and measurement on large scale. To overcome the limited nondiffracting distance generated by the traditional axicon, two kinds of combined axicons based on the transmission properties of conventional axicons, are proposed for generating long-distance nondiffracting Bessel beam. Transmission properties of combined axicons are analyzed and simulated by optical ray tracing and diffraction theory. The results show that two kinds of combined axicons are equivalent to conventional positive axicon on transmission properties, but both of them can generate high quality and long-distance nondiffracting Bessel beam. Meanwhile, they also reduce the difficulties of element processing.
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