Recent advances in holmium doped fibers for high-energy lasers (Conference Presentation)

Baker, Colin; Friebele, E. J.; Burdett, Ashley; Shaw, L. Brandon; Bowman, S. R.; Kim, Woohong; Sanghera, Jasbinder S.; Ballato, John; Kucera, Courtney; Vargas, Amber L.; Hemming, Alexander; Simikov, Nikita; Haub, John

doi:10.1117/12.2310134

Cited by 6 publications

(5 citation statements)

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“…18). While higher slope efficiencies of 61-85% have been experimentally observed in prototype solution doped and nano-particle doped HDFAs [24], and 87% in a laser in [17], we note that our experimental and simulation results are valid for a quite wide range of commercially available Ho-doped fibers.…”

Section: Discussionsupporting

confidence: 55%

Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers

Tench

Walasik

Delavaux

2021

J. Lightwave Technol.

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We report the design and performance of medium slope efficiency (64%) Holmium-doped fiber amplifiers (HDFAs) with novel alternative in-band pump wavelengths in the 1720-2000 nm spectral region. We demonstrate through simulations that pump wavelengths of 1840-1860 nm can yield significantly improved output power, gain, and optical-optical conversion efficiency compared to the previous technical and industry standard pump wavelength of 1940 nm. Our simulations are verified by experimental data.

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Section: Discussionsupporting

confidence: 55%

Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers

Tench

Walasik

Delavaux

2021

J. Lightwave Technol.

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“…It should be noted that other configurations can allow higher efficiency in the class of 100 W laser power (e.g. core-pumped [12] or double-end pumped [13], but these configurations are not compatible with the requirements of thermal load or robustness of a kW laser.…”

Section: Introductionmentioning

confidence: 99%

Realization and simulation of high-power holmium doped fiber lasers for long-range transmission

Gouët¹,

Gustave²,

Bourdon³

et al. 2020

Opt. Express

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We report on our realization of a high-power holmium doped fiber laser, together with the validation of our numerical simulation of the laser. We first present the measurements of the physical parameters that are mandatory to model accurately the laser-holmium interactions in our silica fiber. We then describe the realization of the clad-pumped laser, based on a triple-clad large mode area holmium (Ho) doped silica fiber. The output signal power is 90 W at 2120 nm, with an efficiency of about 50% with respect to the coupled pump power. This efficiency corresponds to the state of the art for clad-pumped Ho-doped fiber lasers in the 100 W power class. By comparing the experimental results to our simulation, we demonstrate its validity and use it to show that the efficiency is limited, for our fiber, by the non-saturable absorption caused by pair-induced quenching between adjacent holmium ions.

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“…ppm) and Al/Er ratio of 50. This group presented also high efficiencies (around 75%) in holmium-doped fibers with Ho 3+ concentrations of thousands of ppm (up to ∼4500 ppm) [31]. In these cases, the Al/Ho ratio was kept 30-50.…”

Section: Slope Efficiencymentioning

confidence: 93%

“…The NP approach is generally considered to give improved laser characteristics than the SD one [7], [26] although excellent results were obtained also with solution-doped fibers [27]- [31]. General opinion preferring NP to SD is based on the idea that nanoparticles form optimized submicron local environment around RE ions, and thus improve their fluorescence characteristics [14], [21].…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle and Solution Doping for Efficient Holmium Fiber Lasers

et al. 2019

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Efficient holmium fiber lasers have been studied as attractive laser sources operating around 2.1 μm. We report on holmium-doped silica fibers prepared by the modified chemical vapor deposition in combination with either a solution-doping method or a nanoparticle-doping method. A set of 15 fibers with various compositions was characterized and compared with respect to their fluorescence lifetime, laser slope efficiency and laser threshold. This set of fibers in wide concentration ranges allowed us to assess reliably the influence of material composition and the influence of doping method. The best-performance fibers exhibited slope efficiency 83.1%, laser threshold 155 mW and a record value of upper laser level lifetime of 1.35 ms. These results were achieved in fibers with holmium concentration lower than 800 molar ppm and Al/Ho molar ratio greater than 70. Significant differences between fibers prepared by solution doping and nanoparticle doping were not observed. The behavior of Al 2 O 3 nanoparticles during fiber preparation is discussed in details.

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Recent advances in holmium doped fibers for high-energy lasers (Conference Presentation)

Cited by 6 publications

References 0 publications

Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers

Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers

Realization and simulation of high-power holmium doped fiber lasers for long-range transmission

Nanoparticle and Solution Doping for Efficient Holmium Fiber Lasers

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