Gourley Kevin, Golub Ilya, Chebbi Brahim
School of Advanced Technology, Algonquin College, Ottawa, Ontario K2G 1V8, Canada.
Appl Opt. 2011 Jan 20;50(3):303-6. doi: 10.1364/AO.50.000303.
We design and manufacture a Fresnel axicon (fraxicon) that generates a quasi-diffraction-free/Bessel beam with a large depth of field. The novel optical element is characterized with both coherent and incoherent light, and its behavior is compared with that of a classical axicon. While the fraxicon exhibits a strong interference pattern in the on-axis intensity distribution, it can be smoothed out when using broadband light, partial spatial coherence light, or by period randomization. As inexpensive, compact/lightweight, and low-absorption elements, fraxicons may find applications in imaging, illumination, and situations where low absorption and dispersion are important.
我们设计并制造了一种菲涅耳轴棱锥（分数轴棱锥），它能产生具有大景深的准无衍射/贝塞尔光束。这种新型光学元件在相干光和非相干光下均有特性表现，并将其行为与传统轴棱锥的行为进行了比较。虽然分数轴棱锥在轴上强度分布中呈现出强烈的干涉图样，但在使用宽带光、部分空间相干光或通过周期随机化时，这种干涉图样可以被消除。作为廉价、紧凑/轻便且低吸收的元件，分数轴棱锥可能会在成像、照明以及低吸收和低色散很重要的场景中找到应用。
