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Two octave supercontinuum generation in a non-silica graded-index multimode fiber
Zahra Eslami1, Lauri Salmela1, Adam Filipkowski2,3
1Photonics Laboratory, Physics Unit, Tampere University, 33014, Tampere, Finland.
Nature Communications
|April 20, 2022
Summary
Researchers generated a two-octave supercontinuum from visible to mid-infrared light using a novel lead-bismuth-gallate fiber. This new fiber offers enhanced nonlinearity for ultrabroadband light source generation.
Area of Science:
- Nonlinear optics
- Materials science
- Optical fiber technology
Background:
- Supercontinuum generation is crucial for broadband light sources.
- Non-silica fibers offer unique nonlinear properties.
- Graded-index multimode fibers enable complex nonlinear phenomena.
Purpose of the Study:
- To generate a two-octave supercontinuum in a non-silica graded-index multimode fiber.
- To investigate supercontinuum generation mechanisms and instabilities.
- To demonstrate enhanced bandwidth compared to silica fibers.
Main Methods:
- Fabrication of a nanostructured graded-index fiber using lead-bismuth-gallate glass.
- Femtosecond pulse pumping in normal and anomalous dispersion regimes.
- Spatio-temporal 3+1D numerical simulations of the generalized nonlinear Schrödinger equation.
Main Results:
- Achieved two-octave supercontinuum generation (700-2800 nm).
- Observed beam self-cleaning due to nonlinear mode mixing.
- Demonstrated significantly larger spectral bandwidth than silica fibers.
Conclusions:
- The lead-bismuth-gallate fiber enables efficient ultrabroadband supercontinuum generation.
- Enhanced nonlinearity and unique fiber design are key to broad bandwidth.
- This work presents a new route for developing mid-infrared ultrabroadband light sources.
