Photodarkening-free fiber laser based on Yb-doped 20/400 gain fiber

Rosales-Garcia, Andrea; Ovtar, Simona; Ingerslev, Kasper; Edvold, B.; Kristensen, Poul; Nicholson, Jeffrey W.; DiGiovanni, D. J.; Pálsdóttir, B.

doi:10.1117/12.2614616

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…A TMI-free 5.2 kW signal power with 78% optical efficiency (Figure 2a) was obtained using a 20 W broadband laser at 1070 nm as a seed source. We evaluated long-term operation of the fiber laser at 2 kW, where no signal power decay was observed in the decreased-TOC Yb 20/400 fiber in 150 hours (Figure 2b), demonstrating that this fiber is compatible with low-photodarkening material designs 10 , allowing for reliable long-term operation. The TMI threshold of standard Yb-doped APS fibers tested in a co-pumped amplifier follows a logarithmic dependance that increases with the HOM bend loss of the fiber, and decreases as its cladding absorption increases, as shown in Figure 3.…”

Section: Methodsmentioning

confidence: 96%

5.2 kW single-mode output power from a Yb 20/400 fiber with reduced thermo-optic coefficient

Rosales-García,

Jensen,

Kristensen

et al. 2024

Fiber Lasers XXI: Technology and Systems

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We report the performance of an LMA Yb-doped fiber, designed for increasing the transverse mode instability threshold and minimizing nonlinear effects in multi-kilowatt class fiber lasers, by reducing the thermo-optic coefficient of the fiber core, compared with that of standard aluminophosphosilicate Yb-doped fibers. A TMI-free 5.2 kW single-mode output power from a Yb 20/400 fiber with a 17.5 µm mode-field diameter was achieved in a broad bandwidth, co-pumped amplifier with 78% optical-to-optical efficiency, while a 4 kW signal output was attained in a 26 GHz linewidth amplifier. Negligible photodarkening loss was observed during 150 hour laser operation at 2 kW.

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Section: Methodsmentioning

confidence: 96%

5.2 kW single-mode output power from a Yb 20/400 fiber with reduced thermo-optic coefficient

Rosales-García,

Jensen,

Kristensen

et al. 2024

Fiber Lasers XXI: Technology and Systems

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“…So far, all published results on BDFAs and bismuth‐doped fiber lasers can only achieve less than 40% optical power conversion efficiency or less than 50% of the quantum limit. This is also in‐contrast to rare‐earth doped fiber lasers such as ytterbium‐doped fiber lasers which can reach >85% optical power conversion efficiency 9 . These observations suggest that most populated bismuth species in BDF may not be BACs .…”

Section: What Are the “Bacs” In Bismuth‐doped Fiber?mentioning

confidence: 93%

“…This is also in-contrast to rare-earth doped fiber lasers such as ytterbium-doped fiber lasers which can reach >85% optical power conversion efficiency. 9 These observations suggest that most populated bismuth species in BDF may not be BACs.…”

Section: What Are the "Bacs" In Bismuth-doped Fiber?mentioning

confidence: 95%

Review of bismuth‐doped fibers used in O‐band optical amplifiers‐scientific challenges and outlook

Luo¹,

Mikhailov²,

Windeler³

et al. 2023

Int J of Appl Glass Sci

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Bismuth-doped phosphosilicate fibers have become the most promising gain medium for O-band amplifiers. Yet scientific challenges on understanding the nature of bismuth active centers (BACs), mechanisms of bismuth cluster formation in the phosphosilicate glass network still exist. It is likely that multiple BACs with different oxidation states in different structural sites all contribute to the broad, nonsymmetric luminescence and gain spectra. Due to the progress in the fundamental understanding of bismuth-doped phosphosilicate glass, various designs of optical amplifiers with decent performances have been demonstrated.

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“…The Ytterbium-doped fiber amplifier is the building block laser source used for both SBC and CBC [12]. Advances in the fiber coupled pump sources [13] and recent improvements in the Large Mode Area (LMA) active fiber [14,15] allow for the production of high yield, low Size, Weight and Power (SWaP), highly reliable, Narrow Linewidth Amplifiers (NLAs) [16].…”

Section: Narrow Linewidth Amplifiersmentioning

confidence: 99%