Adaptive shaping of complex pulsed nondiffracting light fields
Adaptive shaping of complex pulsed nondiffracting light fields
复制标题
复杂脉冲非衍射光场的自适应整形
DOI：
10.1117/12.870855
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发表时间：
2011
期刊：
影响因子：
1.9
通讯作者：
R. Grunwald
中科院分区：
文献类型：
--
作者：
M. Bock;S. Das;R. Grunwald
对于扩展波前分析、结构材料加工、光学信息技术或具有超短脉冲的超分辨显微镜，需要更灵活和鲁棒的光束整形技术。非高斯无条纹贝塞尔光束（“针光束”）可以用纯相位显示器的可编程相位图来生成。此类光束就其特征时空特征而言在相对扩展的区域内表现为传播不变。在这里，我们扩展针脉冲的概念，对其他类型的无衍射领域，包括显着更复杂的。研究表明，无衍射光片、管状光束或像素化图像也可以由对称度较高的简单无衍射成分组成。通过将多个小相位轴棱锥编程到硅基液晶空间光调制器中，可以实现具有广泛传播不变的光谱和时间特性的甚至高度不对称分区的各种各样的非常规无衍射光束。提出了具有集成时间灵敏度的改进型夏克-哈特曼传感器、先进类型的多通道自动调谐器和具有可变焦斑的自适应材料处理。
For an extended wavefront analysis, structured materials processing, optical information technologies, or superresolving microscopy with ultrashort pulses, more flexible and robust techniques of beam shaping are required. Non-Gaussian fringe-free Bessel beams ("needle beams") can be generated with programmable phase maps of phase-only displays. Such beams behave propagation invariant over relatively extended regions with respect to their characteristic spatio-temporal signatures. Here, we extend the concept of needle pulses towards other types of nondiffracting fields including significantly more complex ones. It is shown that also nondiffracting light slices, tubular beams or pixellated images can be composed from simple nondiffracting constituents of higher degree of symmetry. With arrangements of multiple small phase axicons programmed into liquid-crystal-on-silicon spatial light modulators, a large variety of non-conventional nondiffracting beams of even highly asymmetrically partitions can be achieved with widely propagation invariant spectral and temporal properties. Modified Shack-Hartmann sensors with integrated temporal sensitivity, advanced types of multichannel autocorrelators and adaptive materials processing with variable focal spots are proposed.
影响因子：
35
作者：
Fahrbach, Florian O.;Simon, Philipp;Rohrbach, Alexander
通讯作者：
Rohrbach, Alexander