Characterization of transverse mode instability in fiber-laser systems using a position-sensitive detector

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

doi:10.1117/12.2582779

“…In order to determine the TMI threshold by our new method [17], a pump power sweep is carried out over 20 s in the same manner as in the case of the 2PDs method [14]. Hereby the temporal traces of the beam trajectories are trimmed in 10 ms sections, and the encircled area in each case is calculated as previously explained in section 2.2.…”

Section: New Definition Of the Tmi Thresholdmentioning

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.

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“…Our new method is based on the position-sensitive detection of the output beam of a high-power fiber laser system [17]. This method uses a 4-quadrant photodiode (4QPD) which records temporal traces that track the position of the beam in the X-and Y-axis.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Transverse Mode Instability with a 4-Quadrant Photodiode

Kholaif¹,

Jáuregui²,

Tu³

et al. 2023

Preprint

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

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

Characterization of transverse mode instability in fiber-laser systems using a position-sensitive detector

Cited by 3 publications

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Characterization of Transverse Mode Instability with a 4-Quadrant Photodiode

Characterization of Transverse Mode Instability with a 4-Quadrant Photodiode

Characterization of Transverse Mode Instability with a 4-Quadrant Photodiode

Characterization of transverse mode instability with a 4-quadrant photodiode

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