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11 April 2024 Increasing the TMI threshold in fiber lasers for directed-energy applications
Jeff W. Nicholson
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Proceedings Volume PC12939, High-Power Laser Ablation VIII; PC129390M (2024) https://doi.org/10.1117/12.3013083
Event: SPIE High-Power Laser Ablation, 2024, Santa Fe, New Mexico, United States
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.
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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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