Mitigation of transverse mode instability in polarization maintaining, high-power fiber amplifiers

Jáuregui, César; Stihler, Christoph; Kholaif, Sobhy; Tu, Yiming; Limpert, Jens

doi:10.1117/12.2577635

Cited by 7 publications

(8 citation statements)

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“…Thereby, the physics of TMI in PM fibers are very interesting and can potentially give rise to very rich dynamics and effects. The reason for this is that the modal interference patterns (MIP) in each polarization axis have a different period, but the main polarization components do not interfere 3 . Thus, a PM fiber acts effectively as two collocated waveguides with different MIPs that overlap with each other.…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand, it has been shown that this behavior can be exploited to mitigate TMI by washing out the resulting MIP (i.e. the one resulting after the overlap of the MIP from each polarization axis) if the seed is coupled with a polarization that is oriented at 45° with respect to the main polarization axes 3 . On the other hand, it has also been shown that the refractive index grating (RIG) generated by the MIP of the light polarized parallel to one of the axes of the PM fiber can induce a quasi-static energy transfer in the orthogonally polarized light components 4 .…”

Section: Introductionmentioning

confidence: 99%

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Polarization instability in high power fiber amplifiers

Jáuregui-Misas,

Tu,

Kholaif

et al. 2024

Fiber Lasers XXI: Technology and Systems

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polarization instability in high power fiber amplifiers

Jáuregui-Misas,

Tu,

Kholaif

et al. 2024

Fiber Lasers XXI: Technology and Systems

Self Cite

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“…To date, limited research has been conducted on TMI in polarization-maintaining (PM) fibers. In [3] a numerical study of TMI in PM fibers showed that the TMI threshold can be increased by coupling light at an angle of 45° with respect the slow axis. This occurs due to different modal beat lengths in each principal polarization axis, leading to reduction of contrast of the MIP.…”

Section: Introductionmentioning

confidence: 99%

“…To make the study of TMI in PM fibers more general and verify the theory in [3], an experimental analysis of a fiber which is few-mode in both axes is needed.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of transverse mode instability by polarization rotation in high-power PM fiber amplifiers

Palma-Vega,

Hässner,

Kuhn

et al. 2024

Fiber Lasers XXI: Technology and Systems

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We investigate transverse mode instability (TMI) in an in-house large-mode-area polarization maintaining (PM) fiber amplifier. The TMI threshold was systematically measured at different linear polarization input angles with respect to the slow axis of the fiber. At a polarization input angle of 50°, the TMI threshold increased by more than 100% with respect to the threshold of the slow axis and 60% with respect to one of the fast axis. Furthermore, the temporal characteristic of TMI were studied in detail at different polarization input angles but fixed power of 290W, which was above the TMI threshold of the slow and fast axis. This analysis revealed the three different temporal regimes associated to TMI: chaotic fluctuations in the slow-axis, stable at 50°, and periodic fluctuations in the fast axis. These new results provide with valuable insights into the effect of TMI, especially concerning PM fibers, as well as with a relatively simple way of mitigating TMI in these fibers.

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“…Thus far, there are few publications of TMI in PM fibers. In [8], simulations of TMI in PM fibers were presented, with an approach to mitigate TMI by rotating the polarization input angle to 45° with respect to the slow-axis. In [9] a TMI dependence on the angle of the fiber splice in a PM fiber was observed.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of transverse mode instability in large mode area polarization maintaining fibers

Palma-Vega¹,

Häßner²,

Kühn³

et al. 2023

Fiber Lasers XX: Technology and Systems

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In this work we present experimental results of transverse mode instabilities in dependence of the polarization input angle in a large-mode area polarization maintaining fiber amplifier. The transverse mode instabilities threshold was found at 300 W for an input polarization angle aligned parallel to the slow-axis. We demonstrate that at a constant output power of 300 W the temporal stability can significantly be improved by rotating the input polarization angle with respect the slow-axis, indicating an increased threshold. This allowed for further scaling of the fiber amplifier for linear polarization input angles detuned from the slow-axis of the fiber. For operation in the fast-axis (90° to the slow-axis), the power was scaled to up to 475 W without the onset of transverse mode instabilities. However, a static energy transfer from the fast-axis into the slow-axis was observed at powers above 400 W.

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Mitigation of transverse mode instability in polarization maintaining, high-power fiber amplifiers

Cited by 7 publications

References 0 publications

Polarization instability in high power fiber amplifiers

Polarization instability in high power fiber amplifiers

Mitigation of transverse mode instability by polarization rotation in high-power PM fiber amplifiers

Mitigation of transverse mode instability in large mode area polarization maintaining fibers

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