Mitigation of transverse mode instability by heat load modulation in high-power fiber laser amplifiers

Kholaif, Sobhy; Jáuregui-Misas, César; Tu, Yiming; Limpert, Jens

doi:10.1117/12.2609515

“…In this way, the heat load is modulated, which allows controlling the sign of the phase shift. In this work, we experimentally demonstrate dominant FM operation at an average output power significantly higher than the TMI threshold via heat load modulation [4]. The heat-load modulation can be achieved by pulsing the seed, the pump or both simultaneously.…”

mentioning

confidence: 90%

The impact of heat-load modulation on transverse mode instability in high-power, quasi-continuous wave fibre amplifiers

Kholaif

¹

,

Jáuregui

²

,

Tu

³

et al. 2022

EPJ Web Conf.

1

0

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“…In recent years, several ways to explore and mitigate TMI have been proposed [22]. Many of these experimental studies require complex operating regimes such as pulsed pump/pulsed seed operations [13], or/and artificially induced noise [12]. For this reason, it is of high importance to test the accuracy of both the 2PDs method and the 4QPD to characterize TMI dynamics in such complex operating regimes.…”

Section: The Impact Of Power Fluctuationsmentioning

confidence: 99%

“…However, this modal coupling is only allowed if there is a phase shift between the MIP and the RIG [3,9,11]. Such a phase shift can be induced, for example, by perturbations of the system (noise and pump/seed fluctuations), because the RIG has a delayed response to the MIP changes due to the comparatively slow thermal diffusion time of the fiber [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Transverse Mode Instability with a 4-Quadrant Photodiode

Kholaif¹,

Jáuregui²,

Tu³

et al. 2023

Preprint

0

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Transverse mode instability (TMI) represents the main limitation for the power scaling of fiber laser systems with a diffraction-limited beam quality. In this context, it has become increasingly important to find a cheap and reliable way to monitor and characterize TMI and distinguish this effect from other dynamic perturbations. In this work, with the help of a position-sensitive detector, a novel method is developed to characterize the TMI dynamics even in the presence of power fluctuations. The position information of the fluctuating beam is recorded in the X- and Y-axis of the detector, which are used to track the temporal evolution of the center of gravity of the beam. The trajectories described by the beam within a specific time window contain rich information about TMI, which can be used to gain further insight into this phenomenon.

show abstract

Characterization of transverse mode instability with a 4-quadrant photodiode

Kholaif

¹

,

Jáuregui

²

,

Tu

³

et al. 2023

Opt. Express

4

0

View full text Add to dashboard Cite

Transverse mode instability (TMI) represents the main limitation for the power scaling of fiber laser systems with a diffraction-limited beam quality. In this context, it has become increasingly important to find a cheap and reliable way to monitor and characterize TMI and distinguish this effect from other dynamic perturbations. In this work, with the help of a position-sensitive detector, a novel method is developed to characterize the TMI dynamics even in the presence of power fluctuations. The position information of the fluctuating beam is recorded in the X- and Y-axis of the detector, which are used to track the temporal evolution of the center of gravity of the beam. The trajectories described by the beam within a specific time window contain rich information about TMI, which can be used to gain further insight into this phenomenon.

show abstract

Mitigation of transverse mode instability by heat load modulation in high-power fiber laser amplifiers

Cited by 4 publications

References 8 publications

The impact of heat-load modulation on transverse mode instability in high-power, quasi-continuous wave fibre amplifiers

The impact of heat-load modulation on transverse mode instability in high-power, quasi-continuous wave fibre amplifiers

Characterization of Transverse Mode Instability with a 4-Quadrant Photodiode

Characterization of transverse mode instability with a 4-quadrant photodiode

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