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Updated: Jan 27, 2026
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
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Modal instabilities in high power fiber laser oscillators.
Optics Express
|March 17, 2019
Summary
High-power fiber laser instabilities arise from competing transverse modes, leading to chaotic output. Both thermal and inversion effects contribute to these power fluctuations, especially under pulsed pumping.
Area of Science:
- Optics and Photonics
- Laser Physics
- Nonlinear Dynamics
Background:
- High-power fiber oscillators are crucial for various applications.
- Transverse mode competition can lead to complex and unstable laser output.
- Understanding instabilities is key to improving laser performance and reliability.
Purpose of the Study:
- To experimentally investigate transverse mode competition and instabilities in high-power fiber oscillators.
- To identify the dynamic power exchanges and characteristic frequencies of fundamental mode (FM) and high-order modes (HOMs).
- To elucidate the contributions of thermal and inversion effects to observed instabilities.
Main Methods:
- Experimental monitoring of dynamic power exchanges between FM and HOMs.
- Analysis of characteristic instability frequencies under continuous wave (CW) and pulsed pumping.
- Investigation of transient regime dynamics under pulsed pumping.
Main Results:
- Observed rich output dynamics and full chaotic operation due to two competing effective laser cavities.
- Identified distinct thermal and inversion contributions to instabilities by analyzing characteristic frequencies under pulsed pumping.
- Demonstrated that increasing pump power leads to chaotic response via interplay of transverse and longitudinal mode instabilities.
Conclusions:
- Transverse mode competition is a primary driver of instabilities in high-power fiber oscillators.
- Both thermal and inversion effects play successive roles in power instabilities, particularly in the transient regime.
- Laser chaos emerges from the complex interplay between transverse and longitudinal mode instabilities as pump power increases.
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