We demonstrate how spatial beam self-cleaning and supercontinuum generation in graded-index multimode optical fibers can be directly applied in multiplex coherent anti-Stokes Raman Scattering (M-CARS) spectroscopy. Although supercontinuum generation causes pump depletion mainly in the center of the beam, the partial recovery of the pump brightness due to self-cleaning may enable self-referenced M-CARS, with no additional delay lines to synchronize pump and Stokes waves. As a proof-of-principle, we report examples of imaging of single chemical compounds and polystyrene beads. The new scheme paves the way towards simpler M-CARS systems based on multimode fiber sources.
Continuous spatial self-cleaning in GRIN multimode fiber for self-referenced multiplex CARS imaging / Wehbi, S.; Mansuryan, T.; Krupa, K.; Fabert, M.; Tonello, A.; Zitelli, M.; Ferraro, M.; Mangini, F.; Sun, Y.; Vergnole, S.; Kano, H.; Wabnitz, S.; Couderc, V.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 30:10(2022), pp. 16104-16114. [10.1364/OE.452384]
Continuous spatial self-cleaning in GRIN multimode fiber for self-referenced multiplex CARS imaging
Zitelli, M.;Ferraro, M.;Mangini, F.;Sun, Y.;Wabnitz, S.;
2022
Abstract
We demonstrate how spatial beam self-cleaning and supercontinuum generation in graded-index multimode optical fibers can be directly applied in multiplex coherent anti-Stokes Raman Scattering (M-CARS) spectroscopy. Although supercontinuum generation causes pump depletion mainly in the center of the beam, the partial recovery of the pump brightness due to self-cleaning may enable self-referenced M-CARS, with no additional delay lines to synchronize pump and Stokes waves. As a proof-of-principle, we report examples of imaging of single chemical compounds and polystyrene beads. The new scheme paves the way towards simpler M-CARS systems based on multimode fiber sources.| File | Dimensione | Formato | |
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