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Al/Ge co-doped large mode area fiber with high SBS threshold
Optics Express
|June 24, 2009
Summary
We developed a new laser fiber using Al/Ge co-doping to significantly increase the stimulated Brillouin scattering (SBS) threshold. This fiber design enhances laser performance by suppressing unwanted SBS effects.
Area of Science:
- Materials Science
- Optics
- Photonics
Background:
- Stimulated Brillouin scattering (SBS) is a nonlinear optical effect that limits the performance of high-power fiber lasers.
- Increasing the SBS threshold is crucial for developing advanced laser systems.
Purpose of the Study:
- To introduce a novel co-doping strategy for enhancing the SBS threshold in large effective area laser fibers.
- To investigate the impact of Aluminum Oxide (Al2O3) and Germanium Dioxide (GeO2) co-doping on the acoustic-optic overlap integral.
Main Methods:
- Numerical modeling to validate the mechanism of reduced acoustic-optic overlap.
- Fabrication of an Ytterbium (Yb)-doped double clad fiber using the Outside Vapor Deposition (OVD) process.
- Co-doping the fiber core with varying concentrations of Al2O3 and GeO2.
Main Results:
- The co-doping approach successfully reduced the acoustic-optic overlap integral while maintaining a step-index refractive profile.
- Fabricated fiber's acoustic velocity profile was verified using scanning acoustic microscopy.
- An amplifier using the co-doped fiber demonstrated a 6 dB higher SBS threshold compared to undoped fiber.
Conclusions:
- Al/Ge co-doping is an effective method for increasing the SBS threshold in large mode area fibers.
- This technique enables higher power operation of fiber lasers by mitigating nonlinear effects.
- The developed fiber offers improved performance for high-power laser applications.
