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 InF3 optical fiber to achieve a supercontinuum ranging from 1.7 up to 3.4 µm.
Frequency-resolved spatial beam mapping in multimode fibers: application to mid-infrared supercontinuum generation / Leventoux, Y; Granger, G; Krupa, K; Mansuryan, T; Fabert, M; Tonello, A; Wabnitz, S; Couderc, V; Février, S. - In: OPTICS LETTERS. - ISSN 0146-9592. - 46:15(2021), pp. 3717-3720. [10.1364/OL.428623]
Frequency-resolved spatial beam mapping in multimode fibers: application to mid-infrared supercontinuum generation
Wabnitz, S;
2021
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 InF3 optical fiber to achieve a supercontinuum ranging from 1.7 up to 3.4 µm.File | Dimensione | Formato | |
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