Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time
Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time
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DOI：
10.1038/lsa.2017.117
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Bangshan Sun;P. Salter;C. Roider;A. Jesacher;J. Strauss;J. Heberle;M. Schmidt;M. Booth
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文献类型：
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作者：
Bangshan Sun;P. Salter;C. Roider;A. Jesacher;J. Strauss;J. Heberle;M. Schmidt;M. Booth
超短脉冲的光谱色散允许光在空间和时间上同时聚焦，这产生了所谓的时空焦点。这种时空耦合可以与现有的全息技术相结合，以在产生聚焦光场时给出进一步的控制维度。在本研究中，它示出了放置在光瞳平面的物镜和照明的空间啁啾超短脉冲的相位全息图可以用来产生三维阵列的时空聚焦点。通过利用在应用同时空间和时间聚焦（SSTF）时在焦点处产生的脉冲前倾斜，可以及时重叠相邻焦点以创建平滑的强度分布。由此产生的光场显示出高水平的轴向限制，通过双光子显微镜和玻璃的非线性激光制造的实验演示。
The spectral dispersion of ultrashort pulses allows the simultaneous focusing of light in both space and time, which creates so-called spatiotemporal foci. Such space–time coupling may be combined with the existing holographic techniques to give a further dimension of control when generating focal light fields. In the present study, it is shown that a phase-only hologram placed in the pupil plane of an objective and illuminated by a spatially chirped ultrashort pulse can be used to generate three-dimensional arrays of spatio-temporally focused spots. By exploiting the pulse front tilt generated at focus when applying simultaneous spatial and temporal focusing (SSTF), it is possible to overlap neighboring foci in time to create a smooth intensity distribution. The resulting light field displays a high level of axial confinement, with experimental demonstrations given through two-photon microscopy and the non-linear laser fabrication of glass.