Presentation
11 April 2024 Increasing the TMI threshold in fiber lasers for directed-energy applications
Author Affiliations +
Abstract
We present recent results on fibers for directed energy applications. These fibers use new designs for high transverse mode instability thresholds obtained by increasing the higher-order mode losses. This approach allows for simultaneously increasing the MFD of the fundamental mode while also maintaining high TMI thresholds, even for higher-absorption fibres with increased heat load. Using such an approach, 5 kW of signal power at 26 GHz linewidth was obtained from a 7 m long amplifier using a gain fiber with 20 µm MFD and 400 µm cladding. For high-power, high-energy pulse lasers, we have used this design approach to demonstrate 30/400 fibers with 25 µm MFD that amplified millijoule, nanosecond pulses to killowatt average powers.
Conference Presentation
© (2024) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeff W. Nicholson "Increasing the TMI threshold in fiber lasers for directed-energy applications", Proc. SPIE PC12939, High-Power Laser Ablation VIII, PC129390M (11 April 2024); https://doi.org/10.1117/12.3013083
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KEYWORDS
Fiber lasers

Laser damage threshold

Directed energy weapons

High power fiber lasers

High power lasers

Laser systems engineering

Pulse signals

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