Spatiotemporal instability of femtosecond pulses in graded-index multimode fibers

Date
2017
Authors
Teǧin, U.
Ortaç, B.
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Source Title
IEEE Photonics Technology Letters
Print ISSN
1041-1135
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Publisher
Institute of Electrical and Electronics Engineers Inc.
Volume
29
Issue
24
Pages
2195 - 2198
Language
English
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Abstract

We study the spatiotemporal instability generated by a universal unstable attractor in normal dispersion graded-index multimode fiber for femtosecond pulses for the first time. Experimentally observed spatiotemporal instability sidebands are 91-THz detuned from the pump wavelength of 800 nm. Detailed analysis carried out numerically by employing coupled-mode pulse propagation model. Numerically obtained results are well-aligned with experimental observations. Spatial evolution of the total field and spatiotemporal instability sidebands is calculated numerically, and for the input pulses of 200-fs duration, formation and evolution of spatiotemporal instability are shown in both spatial and temporal domains. Our results present the unique features of spatiotemporal instability, such as remarkable frequency shift with inherited beam shape of instability sidebands.

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