Spectral-temporal-spatial customization via modulating multimodal nonlinear pulse propagation

Tong Qiu, Honghao Cao, Kunzan Liu, Li-Yu Yu, Manuel Levy, Eva Lendaro, Fan Wang and Sixian You ()
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Tong Qiu: Massachusetts Institute of Technology
Honghao Cao: Massachusetts Institute of Technology
Kunzan Liu: Massachusetts Institute of Technology
Li-Yu Yu: Massachusetts Institute of Technology
Manuel Levy: Massachusetts Institute of Technology
Eva Lendaro: Massachusetts Institute of Technology
Fan Wang: Massachusetts Institute of Technology
Sixian You: Massachusetts Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Multimode fibers (MMFs) are gaining renewed interest for nonlinear effects due to their high-dimensional spatiotemporal nonlinear dynamics and scalability for high power. High-brightness MMF sources with effective control of the nonlinear processes would offer possibilities in many areas from high-power fiber lasers, to bioimaging and chemical sensing, and to intriguing physics phenomena. Here we present a simple yet effective way of controlling nonlinear effects at high peak power levels. This is achieved by leveraging not only the spatial but also the temporal degrees of freedom during multimodal nonlinear pulse propagation in step-index MMFs, using a programmable fiber shaper that introduces time-dependent disorders. We achieve high tunability in MMF output fields, resulting in a broadband high-peak-power source. Its potential as a nonlinear imaging source is further demonstrated through widely tunable two-photon and three-photon microscopy. These demonstrations provide possibilities for technology advances in nonlinear optics, bioimaging, spectroscopy, optical computing, and material processing.

Date: 2024
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DOI: 10.1038/s41467-024-46244-5

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