Abstract

We present a new, to the best of our knowledge, spatial-spectral mapping technique permitting measurement of the beam intensity at the output of a graded-index multimode fiber (GIMF) with sub-nanometric spectral resolution. We apply this method to visualize the fine structure of the beam shape of a sideband generated at 1870 nm by geometric parametric instability (GPI) in a GIMF. After spatial-spectral characterization, we amplify the GPI sideband with a thulium-doped fiber amplifier to obtain a microjoule-scale picosecond pump whose spectrum is finally broadened in a segment of ${{\rm InF} _3}$ optical fiber to achieve a supercontinuum ranging from 1.7 up to 3.4 µm.

© 2021 Optical Society of America

Spatiotemporal characterization of supercontinuum extending from the visible to the mid-infrared in a multimode graded-index optical fiber

K. Krupa, C. Louot, V. Couderc, M. Fabert, R. Guenard, B. M. Shalaby, A. Tonello, D. Pagnoux, P. Leproux, A. Bendahmane, R. Dupiol, G. Millot, and S. Wabnitz
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Three octave visible to mid-infrared supercontinuum generation seeded by multimode silica fiber pumped at 1064 nm

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Second harmonic generation in multimode graded-index fibers: spatial beam cleaning and multiple harmonic sideband generation

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Opt. Lett. 42(5) 971-974 (2017)

Ultra-efficient, 10-watt-level mid-infrared supercontinuum generation in fluoroindate fiber

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Opt. Lett. 44(9) 2378-2381 (2019)

Tailoring frequency generation in uniform and concatenated multimode fibers

Z. Sanjabi Eznaveh, M. A. Eftekhar, J. E. Antonio Lopez, M. Kolesik, A. Schülzgen, F. W. Wise, D. N. Christodoulides, and R. Amezcua Correa
Opt. Lett. 42(5) 1015-1018 (2017)