Spatial characterization of Bessel-like beams for strong-field physics
Spatial characterization of Bessel-like beams for strong-field physics
复制标题
DOI：
10.1364/oe.25.001646
复制
发表时间：
2017-02-06
期刊：
影响因子：
3.8
通讯作者：
Trallero-Herrero, Carlos A.
中科院分区：
文献类型：
--
作者：
Summers, Adam M.;Yu, Xiaoming;Trallero-Herrero, Carlos A.
我们提出了一种紧凑、简单的设计，用于产生和调谐类贝塞尔光束的光斑大小和有效焦距。特别是，这种装置为在高功率飞秒激光系统中使用类贝塞尔光束提供了一个重要的工具。将浅角轴棱镜与球面透镜结合使用，我们证明了在保持较长有效焦距的同时，将类贝塞尔模聚焦到与锐轴棱镜相当的焦斑尺寸是可能的。使用精确的高动态范围成像技术对所得到的焦点轮廓进行了详细的表征。在定量上，我们引入了一个度量(R-0.8)，它定义了包含总能量80%的光斑大小。我们的设置克服了长工作距离和小光斑尺寸之间的典型折衷。这与大多数实验必须在真空中进行的强场物理特别相关。(C)2017年美国光学学会
We present a compact, simple design for the generation and tuning of both the spot size and effective focal length of Bessel-like beams. In particular, this setup provides an important tool for the use of Bessel-like beams with high-power, femtosecond laser systems. Using a shallow angle axicon in conjunction with a spherical lens, we show that it is possible to focus Bessel-like modes to comparable focal spot sizes to sharp axicons while maintaining a long effective focal length. The resulting focal profiles are characterized in detail using an accurate high dynamic range imaging technique. Quantitatively, we introduce a metric (R-0.8) which defines the spot-size containing 80% of the total energy. Our setup overcomes the typical compromise between long working distances and small spot sizes. This is particularly relevant for strong-field physics where most experiments must operate in vacuum. (C) 2017 Optical Society of America