Study of seeding mechanisms of TMI with spatially and temporally resolved imaging

Simon L. Christensen; Mette M. Johansen; Mattia Michieletto; Marco Triches; Martin D. Maack; Jesper Lægsgaard

doi:10.1117/12.2588432

5 March 2021 Study of seeding mechanisms of TMI with spatially and temporally resolved imaging

Simon L. Christensen, Mette M. Johansen, Mattia Michieletto, Marco Triches, Martin D. Maack, Jesper Lægsgaard

Proceedings Volume 11665, Fiber Lasers XVIII: Technology and Systems; 116650Y (2021) https://doi.org/10.1117/12.2588432
Event: SPIE LASE, 2021, Online Only

Abstract

In this work we investigate transverse mode instability (TMI) in the presence of pump intensity noise and a controlled perturbation of the input coupling for a rod-type fiber amplifier using spatially and temporally resolved imaging (ST). We show that inherent pump intensity noise from the power supply can define significant peaks in the resulting TMI spectrum. ST measurements in the transition region of TMI also indicates that the simple picture of TMI being seeded by the combination of a static initial fraction of LP11 and pump or signal intensity noise is not valid for our measurements. Furthermore, we present seeding of TMI by perturbing the input coupling dynamically which allows measurements of the TMI gain as a function of frequency and signal power.

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Citation Download Citation

Simon L. Christensen, Mette M. Johansen, Mattia Michieletto, Marco Triches, Martin D. Maack, and Jesper Lægsgaard "Study of seeding mechanisms of TMI with spatially and temporally resolved imaging", Proc. SPIE 11665, Fiber Lasers XVIII: Technology and Systems, 116650Y (5 March 2021); https://doi.org/10.1117/12.2588432

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