Abstract

Ultrashort laser pulse propagation through few-mode optical fibers is a complex spatiotemporal event: due to mode spatial structures and intermodal delays and dispersions, pulses in such fibers experience spatial patterns and temporal elongations, which are generally considered detrimental for beam quality and pulse shape. However, with careful control of the launched modal contents and their interactions, we demonstrate that, using a single-mode-few-mode (SFe) optical fiber device, ultrashort pulses with various desirable spatiotemporal properties can be achieved. In the SFe device, pulse transformations over space, time, and frequency are related by multimode interference, and in the far field, pulse profile can be obtained by calculating diffraction integrals. We show that, using two example cases (a Bessel-like pulse and an optical bottle pulse), our approach can generate spatiotemporally structured pulses potentially suitable for applications in material science and biological imaging.

© 2021 Optical Society of America

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References

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Supplementary Material (7)

NameDescription
Visualization 1       A Bessel-like pulse generated by a constructive interference between about 90% of LP01 mode and 10% LP02 mode.
Visualization 2       Pulse generated by destructive mode interference, as a comparison.
Visualization 3       Pulse with an optical bottle structure.
Visualization 4       Pulse cross-sectional view at zd = 1 mm, plotted with all spectral components.
Visualization 5       Corresponding components in red color channel of the normalized pulse spectrum, at zd = 1 mm.
Visualization 6       Corresponding components in green color channel of the normalized pulse spectrum, at zd = 1 mm.
Visualization 7       Corresponding components in blue color channel of the normalized pulse spectrum, at zd = 1 mm.

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (11)

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Equations (5)

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