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March 7, 2026MicromachinesOpen Access

Transverse Mode Instability in High-Power Yb-Doped Double-Clad Fiber Amplifiers: A Three-Layer Optical–Thermal Analysis Based on Stimulated Thermal Rayleigh Scattering

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Authors

ECElbis Santos CardosoUniversidade Federal de São PauloRSRicardo Elgul SamadCMCláudio C. MottaUniversidade Federal de São Paulo

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Overview

This analysis evaluates transverse mode instability in Yb-doped double-clad fiber amplifiers, indicating significant thermal-optic interactions.

Key Points

  • The study aims to analyze transverse mode instability in high-power Yb-doped double-clad fiber amplifiers using a novel optical–thermal model.
  • Developed a coupled optical–thermal model for a fiber amplifier at specific wavelengths.
  • Calculated modal fields using weakly guiding approximation and semi-WGA for cladding interfaces.
  • Evaluated nonlinear stimulated thermal Rayleigh scattering coupling coefficient considering gain saturation.
  • The inner cladding significantly alters the optical and thermal mode structures.
  • The overlap between fundamental and higher-order modes is modified, affecting TMI behavior.
  • The formulation predicts TMI thresholds more accurately in high-power systems.

Cite This Study

Cardoso et al. (2026) studied this question.

synapsesocial.com/papers/69abc1535af8044f7a4e9e52https://doi.org/10.3390/mi17030326
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