High quality quasi-Bessel beam generated by round-tip axicon
High quality quasi-Bessel beam generated by round-tip axicon
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DOI：
10.1364/oe.16.012688
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发表时间：
2008-08-18
期刊：
影响因子：
3.8
通讯作者：
Zemanek, Pavel
中科院分区：
文献类型：
--
作者：
Brzobohaty, Oto;Cizmar, Tomas;Zemanek, Pavel
本文从理论和实验上研究了由圆尖轴棱锥产生的零级贝塞尔光束的空间光强分布。这样的尖端产生折射光束，该折射光束与在轴棱锥后面产生的准贝塞尔光束干涉。进而发生不期望的强度调制，其显著地干扰准贝塞尔光束的独特性质，即横向强度分布的恒定形状和轴上光束强度沿着光束传播的缓慢变化。我们展示了如何在傅立叶平面中的光束的空间过滤，提高了这种空间光束分布，并消除了不需要的调制。我们使用一个有效的数值方法的基础上汉克尔变换来模拟光束的传播背后的轴棱锥和过滤器。我们实验测量了光束在多个侧面的光强分布，并随后重建了光束的空间光强分布。计算和测量的光束分布进行了比较，得到的协议是非常好的。(C)2008年美国光学学会。
We study theoretically and experimentally the spatial intensity distribution of the zero-order Bessel beam formed by the axicon which possess a rounded tip. Such a tip generates a refracted beam that interferes with the quasi-Bessel beam created behind the axicon. In turn an undesired intensity modulation occurs that significantly disturbs the unique properties of the quasi-Bessel beam - namely the constant shape of the lateral intensity distribution and the slow variation of the on-axis beam intensity along the beam propagation. We show how the spatial filtration of the beam in the Fourier plane improves this spatial beam distribution and removes the undesired modulation. We use an efficient numerical method based on Hankel transformations to simulate the propagation of the beam behind the axicon and filter. We experimentally measure the intensity distribution of the beam in many lateral planes and subsequently reconstruct the spatial intensity distribution of the beam. Computed and measured beam distributions are compared and the obtained agreement is very good. (C) 2008 Optical Society of America.