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Estimating modal instability threshold for photonic crystal rod fiber amplifiers
Mette Marie Johansen1, Kristian Rymann Hansen, Marko Laurila
1DTU Fotonik, Technical University of Denmark, Ørsteds Plads building 343, 2800 Kgs. Lyngby, DK-Denmark. mmajo@fotonik.dtu.dk
Optics Express
|July 12, 2013
Summary
A new model estimates the transverse modal instability (TMI) threshold in photonic crystal rod amplifiers. The threshold is predicted between 370-440 W, depending on seed laser noise, crucial for high-power fiber lasers.
Area of Science:
- Photonics
- Fiber Optics
- Laser Physics
Background:
- High-power fiber amplifiers are essential for various applications.
- Transverse Modal Instability (TMI) limits the power scalability of fiber amplifiers.
- Understanding TMI thresholds is critical for designing advanced laser systems.
Purpose of the Study:
- To develop a semi-analytic numerical model for predicting TMI threshold in photonic crystal rod amplifiers.
- To investigate the impact of thermal effects and seed laser noise on TMI.
Main Methods:
- A semi-analytic numerical model was developed.
- Finite element simulations were used to model thermally induced waveguide perturbations.
- Relative Intensity Noise (RIN) of the seed laser was incorporated to study mode coupling.
Main Results:
- The model predicts TMI thresholds ranging from approximately 370 W to 440 W.
- The predicted threshold is dependent on the RIN of the seed laser.
- Distributed modal filtering rod fiber was considered in the simulations.
Conclusions:
- The developed model provides a valuable tool for estimating TMI thresholds in photonic crystal rod amplifiers.
- Thermal effects and seed laser RIN significantly influence the TMI threshold.
- The findings aid in the design of higher-power, stable fiber laser systems.
