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High-efficiency Raman conversion in SF6- and CF4-filled hollow-core photonic bandgap fibers
Optics Letters
|November 28, 2019
Summary
This study compares stimulated Raman scattering in hollow-core fibers using sulfur hexafluoride (SF6) and tetrafluoromethane (CF4). SF6 gas achieved higher conversion efficiency for light generation, marking a first for SF6 in this application.
Area of Science:
- Nonlinear Optics
- Fiber Optics
- Laser Physics
Background:
- Stimulated Raman scattering (SRS) is a key nonlinear optical process.
- Hollow-core photonic bandgap fibers (HC-PBGFs) offer unique light-gas interaction properties.
- Gas-filled fibers enable novel light generation and wavelength conversion techniques.
Purpose of the Study:
- To experimentally investigate and compare vibrational stimulated Raman scattering (SRS) in HC-PBGFs.
- To evaluate the performance of sulfur hexafluoride (SF6) and tetrafluoromethane (CF4) as Raman gain media.
- To characterize SRS conversion efficiency as a function of gas type, fiber length, and input power.
Main Methods:
- Utilized nanosecond-duration laser pulses at 1030 nm.
- Coupled light into 15 m long HC-PBGFs filled with SF6 and CF4.
- Measured first and second Stokes orders of Raman-scattered light.
- Analyzed conversion efficiency versus input peak power and gas properties.
Main Results:
- Achieved 55.7% conversion efficiency to the first Stokes order using SF6 at 0.63 kW input peak power.
- Observed a higher conversion threshold and maximum 45.4% efficiency with CF4.
- Demonstrated the feasibility of SRS in SF6-filled HC-PBGFs.
Conclusions:
- Sulfur hexafluoride (SF6) is a highly efficient gas for stimulated Raman scattering in hollow-core photonic bandgap fibers.
- SF6 offers superior performance compared to tetrafluoromethane (CF4) for this application.
- This work represents the first reported SRS conversion experiment using SF6-filled hollow-core fibers.
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