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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
Published on: May 27, 2013
Broadband supercontinuum generation in As2Se3 chalcogenide wires by avoiding the two-photon absorption effects
Alaa Al-kadry1, Chams Baker, Mohammed El Amraoui
1Department of Electrical and Computer Engineering, McGill University, Montréal, Québec, Canada. alaa.al‑kadry@mail.mcgill.ca
Optics Letters
|April 3, 2013
Summary
Researchers generated a broadband supercontinuum (SC) from 1260 to 2200 nm using a chalcogenide (ChG) wire. This was achieved by avoiding two-photon absorption, enabling wider spectral broadening for the SC light source.
Area of Science:
- Nonlinear Optics
- Materials Science
Background:
- Supercontinuum generation is crucial for various photonic applications.
- Chalcogenide (ChG) materials offer unique nonlinear properties but are susceptible to two-photon absorption (TPA).
- TPA at 1550 nm limits supercontinuum (SC) bandwidth in As2Se3.
Purpose of the Study:
- To generate a broadband supercontinuum (SC) in As2Se3.
- To overcome the limitations of two-photon absorption (TPA) at 1550 nm.
- To achieve SC generation spanning beyond 2000 nm.
Main Methods:
- Utilized a 10 cm As2Se3 chalcogenide (ChG) wire.
- Pumped the ChG wire at 1550 nm.
- Employed a pre-shifting technique using Raman effect in silica fiber to shift the pump soliton away from the TPA region before launching into the ChG wire.
Main Results:
- Generated a broadband supercontinuum (SC) from 1260 to 2200 nm.
- Successfully avoided two-photon absorption (TPA) effects at 1550 nm.
- Demonstrated a wide spectral broadening in the As2Se3 ChG wire.
Conclusions:
- The developed method effectively suppresses TPA in As2Se3.
- Broadband SC generation in the 1260-2200 nm range is achievable in As2Se3.
- This technique enhances the potential of ChG fibers for advanced photonic applications.
