Fiber supercontinua represent light sources of pivotal importance for a wide range of applications,ranging from optical communications to frequency metrology.Although spectra encompassing more than three octaves can b...Fiber supercontinua represent light sources of pivotal importance for a wide range of applications,ranging from optical communications to frequency metrology.Although spectra encompassing more than three octaves can be produced,the applicability of such spectra is strongly hampered due to coherence degradation during spectral broadening.Assuming pulse parameters at the cutting edge of currently available laser technology,we demonstrate the possibility of strongly coherent supercontinuum generation.In a fiber with two zero-dispersion wavelengths a higher-order soliton experiences a temporal breakdown,without any compression or splitting behavior,which leads to nearly complete conversion of input solitonic radiation into resonant nonsolitonic radiation in the dispersive wave regime.As the process is completely deterministic and shows little sensitivity to input noise,the resulting pulses appear to be compressible down to the sub-cycle level and may thus hold a new opportunity for direct generation of attosecond pulses in the visible to near ultraviolet wavelength range.展开更多
Exploiting a plasmonic resonance,near-perfect grating structures have been reported,with a regularity that exceeds typical commercially available diffraction gratings.
Multimode nonlinear optics is used to overcome a long-standing limitation of fiber optics,tightly phase locking several spatial modes and enabling the coherent transport of a wave packet through a multimode fiber.A si...Multimode nonlinear optics is used to overcome a long-standing limitation of fiber optics,tightly phase locking several spatial modes and enabling the coherent transport of a wave packet through a multimode fiber.A similar problem is encountered in the temporal compression of multimillijoule pulses to few-cycle duration in hollow gas-filled fibers.Scaling the fiber length to up to 6 m,hollow fibers have recently reached 1 TW of peak power.Despite the remarkable utility of the hollow fiber compressor and its widespread application,however,no analytical model exists to enable insight into the scaling behavior of maximum compressibility and peak power.Here we extend a recently introduced formalism for describing mode locking to the analog scenario of locking spatial fiber modes together.Our formalism unveils the coexistence of two soliton branches for anomalous modal dispersion and indicates the formation of stable spatiotemporal light bullets that would be unstable in free space,similar to the temporal cage solitons in mode-locking theory.Our model enables deeper understanding of the physical processes behind the formation of such light bullets and predicts the existence of multimode solitons in a much wider range of fiber types than previously considered possible.展开更多
基金support by the DFG(projects BA 4156/4-1,MO 850/19-1)Nieders.Vorab(project ZN3061).
文摘Fiber supercontinua represent light sources of pivotal importance for a wide range of applications,ranging from optical communications to frequency metrology.Although spectra encompassing more than three octaves can be produced,the applicability of such spectra is strongly hampered due to coherence degradation during spectral broadening.Assuming pulse parameters at the cutting edge of currently available laser technology,we demonstrate the possibility of strongly coherent supercontinuum generation.In a fiber with two zero-dispersion wavelengths a higher-order soliton experiences a temporal breakdown,without any compression or splitting behavior,which leads to nearly complete conversion of input solitonic radiation into resonant nonsolitonic radiation in the dispersive wave regime.As the process is completely deterministic and shows little sensitivity to input noise,the resulting pulses appear to be compressible down to the sub-cycle level and may thus hold a new opportunity for direct generation of attosecond pulses in the visible to near ultraviolet wavelength range.
文摘Exploiting a plasmonic resonance,near-perfect grating structures have been reported,with a regularity that exceeds typical commercially available diffraction gratings.
基金Fundamental Research Funds for the Central Universities (00007475)CSC-DAAD (57460082)。
文摘Multimode nonlinear optics is used to overcome a long-standing limitation of fiber optics,tightly phase locking several spatial modes and enabling the coherent transport of a wave packet through a multimode fiber.A similar problem is encountered in the temporal compression of multimillijoule pulses to few-cycle duration in hollow gas-filled fibers.Scaling the fiber length to up to 6 m,hollow fibers have recently reached 1 TW of peak power.Despite the remarkable utility of the hollow fiber compressor and its widespread application,however,no analytical model exists to enable insight into the scaling behavior of maximum compressibility and peak power.Here we extend a recently introduced formalism for describing mode locking to the analog scenario of locking spatial fiber modes together.Our formalism unveils the coexistence of two soliton branches for anomalous modal dispersion and indicates the formation of stable spatiotemporal light bullets that would be unstable in free space,similar to the temporal cage solitons in mode-locking theory.Our model enables deeper understanding of the physical processes behind the formation of such light bullets and predicts the existence of multimode solitons in a much wider range of fiber types than previously considered possible.
