
1.Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
2.Institute of Photonic Technologies, Friedrich-Alexander-University ErlangenNuremberg, Konrad-Zuse-Strasse 3/5, Erlangen 91052, Germany
3.Division of Biomedical Physics, Innsbruck Medical University, Mullerstrasse 44, Innsbruck 6020, Austria
4.Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander University Erlangen-Nuremberg, Paul-Gordan-Strasse 6, Erlangen 91052, Germany
5.Centre for Neural Circuits and Behaviour, University of Oxford, Mansfield Road, Oxford OX1 3SR, UK
MJ Booth, Email: martin.booth@eng.ox.ac.uk
Published:2018,
Published Online:12 January 2018,
Received:14 May 2017,
Revised:08 August 2017,
Accepted:08 August 2017
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Sun, B. S. et al. Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time. Light: Science & Applications, 7, 17117 (2018).
Sun, B. S. et al. Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time. Light: Science & Applications, 7, 17117 (2018). DOI: 10.1038/lsa.2017.117.
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.
laser material processinglight shapingspatiotemporal focusingultrafast lasers
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