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12 September 2021 Accurate and efficient modeling of the transverse mode instability in high-energy laser amplifiers using the phase-matched model
Curtis R. Menyuk, Joshua T. Young, Jonathan Hu, Andrew J. Goers, David M. Brown, Michael L. Dennis
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Proceedings Volume 11867, Technologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V; 118670B (2021) https://doi.org/10.1117/12.2603809
Event: SPIE Security + Defence, 2021, Online Only
Abstract
We review recent work in which we developed a phase-matched model to study the transverse mode instability (TMI) in high-energy laser amplifiers. The standard models for TMI have contributions that vary rapidly compared to the beat period between the fundamental mode and the higher-order modes in the problem. In the phase-matched model, we neglect these rapidly varying contributions. We consider a realistic example with a Yb-doped fiber amplifier that is similar to the amplifier that was considered by Naderi et al. [Opt. Exp., 21(13), 16111 (2013)], but with a more realistic 10-m length. In this example, only one higher-order mode is present. We show that the computational speedup of the phase-matched model is on the order of 100 with no loss of accuracy even in the highly-saturated nonlinear regime.
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Curtis R. Menyuk, Joshua T. Young, Jonathan Hu, Andrew J. Goers, David M. Brown, and Michael L. Dennis "Accurate and efficient modeling of the transverse mode instability in high-energy laser amplifiers using the phase-matched model", Proc. SPIE 11867, Technologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V, 118670B (12 September 2021); https://doi.org/10.1117/12.2603809
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KEYWORDS
Laser amplifiers
Fiber amplifiers
Wave propagation
Acoustics
Laser development
Numerical simulations
Optical amplifiers
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