6533b83afe1ef96bd12a7b19
RESEARCH PRODUCT
Second harmonic generation in multimode graded-index fibers: spatial beam cleaning and multiple harmonic sideband generation
Stefan WabnitzVincent CoudercUmberto MinoniGuy MillotDaniele ModottoD. CeoldoAlessandro TonelloKatarzyna Krupasubject
PhysicsMulti-mode optical fiberSidebandbusiness.industryLithium niobatePhysics::OpticsSecond-harmonic generation02 engineering and technologyFundamental frequency021001 nanoscience & nanotechnology01 natural sciencesAtomic and Molecular Physics and Optics010309 opticschemistry.chemical_compoundOpticschemistry0103 physical sciencesHarmonicFiber0210 nano-technologybusinessBeam (structure)description
We study experimentally and numerically the spectral and spatial dynamics of second harmonic generation in an all-optically poled multimode graded-index fiber. In contrast with poled single-mode fibers, in a multimode graded-index fiber a pump can generate a series of sharp sidebands around its second harmonic (SH) that originate from the sub-millimetric periodic evolution of the intensity at the fundamental frequency. The mutual interaction between the fundamental and its SH may also strongly affect the spatial distribution of guided light for both colors: when increasing the pump power, both fundamental and SH output beams evolve from disordered multimode speckles into two bell-shaped beams.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-03-02 | Optics Letters |