Numerical Simulation of High-Energy, Ytterbium-Doped Amplifier Tunability

João, Celso P.; Wemans, J.; Figueira, Gonçalo

doi:10.3390/app3010288

Cited by 5 publications

References 13 publications

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808 nm excited energy migration upconversion nanoparticles driven by a Nd³⁺–Trinity system with color-tunability and superior luminescence properties

Guo

Tsang

et al. 2018

Nanoscale

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We have developed energy migration upconversion (EMU) nanoparticles (UCNPs) with optimal Nd-sensitization under excitation of an 808 nm laser to avoid over-heating effects caused by a 980 nm laser while maximizing the excitation efficiency. To realize efficient 808 nm sensitization, a "Nd-Trinity system" was implemented in the energy migration upconversion (EMU) cores (NaGdF:Yb,Tm@NaGdF:Yb,X, X = Eu/Tb), resulting in a core-multishell structure of EMU cores (accumulation layer@activation layer)@transition layer@harvest layer@activation layer. The spatially separated dopants and optimized Yb/Nd content effectively prevented severe quenching events in the UCNPs and their Nd-sensitized EMU-based photoluminescence mechanism was studied under 808 nm excitation. These Nd-Trinity EMU system UCNPs presented enhanced upconversion luminescence and prolonged lifetime compared to the 980 nm excited UCNPs of the EMU system. It is proposed that 975 nm and 1056 nm NIR photons induced from the Nd → Yb energy transfer facilitate the Tm accumulation process due to the matched energy gaps, which contributes to the extended lifetimes. More importantly, the synthesized UCNPs had a small average size of sub-15 nm and they not only exhibited color-tunability via Eu/Tb activators, but also released a larger portion of Tm red emission at 647 nm and had better penetration ability in water under 808 nm excitation, which are favorable for bioimaging applications.

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808 nm excited energy migration upconversion nanoparticles driven by a Nd³⁺–Trinity system with color-tunability and superior luminescence properties

Guo

Tsang

et al. 2018

Nanoscale

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High Repetition Rate Yb:CaF<sub>2</sub> Multipass Amplifiers Operating in the 100-<roman>mJ</roman> Range

Papadopoulos

Friebel

Pellégrina

et al. 2015

IEEE J. Select. Topics Quantum Electron.

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We present the research advances on the development of 50-200 mJ energy range diode-pumped Yb:CaF 2based multipass amplifiers operating at relatively high repetition rates. These laser amplifiers are based on diverse innovative geometries. All these innovations aim to design compact, stable and reliable amplifiers adapted to our application that consists in pumping ultrashort-pulse OPCPA (optical parametric chirped pulse amplifier) systems in the frame of the Apollon 10 PW laser project. The targeted repetition rate is in the range of 20-100 Hz with energies of few tens of mJ for the first stages up to 1 J for the final stage. An analysis of the specificities of Yb:CaF 2 is done to explain the different options we chose to fulfil these specifications. The critical points and limitations of the multipass Yb:CaF 2-based amplifiers are subsequently discussed. To overcome the encountered problems, different issues are investigated such as crystal optimisation, laser head geometry, thermo-optical dynamics or coherent combining techniques. Experimental results for different multipass configurations are demonstrated and discussed.

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Radially and azimuthally polarized laser beams by thin-disk laser

Aghbolaghi

Charehjolo

2016

Appl. Opt.

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The generation of radially and azimuthally polarized beams is theoretically investigated in thin-disk laser configurations by writing Jones matrices for optical elements. Higher modes are omitted by aperture and the mode-selection operation is done by discontinuous phase elements. Two modes, TEM_01x and TEM_01y, are combined to generate the radially and azimuthally polarized laser beam. The polarization of the output beams is studied by the extended Jones matrices. In addition, the output power of the thin-disk laser is numerically estimated by solving the rate equations in ytterbium-doped materials.

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Numerical Simulation of High-Energy, Ytterbium-Doped Amplifier Tunability

Cited by 5 publications

References 13 publications

808 nm excited energy migration upconversion nanoparticles driven by a Nd³⁺–Trinity system with color-tunability and superior luminescence properties

808 nm excited energy migration upconversion nanoparticles driven by a Nd³⁺–Trinity system with color-tunability and superior luminescence properties

High Repetition Rate Yb:CaF<sub>2</sub> Multipass Amplifiers Operating in the 100-<roman>mJ</roman> Range

Radially and azimuthally polarized laser beams by thin-disk laser

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Numerical Simulation of High-Energy, Ytterbium-Doped Amplifier Tunability

Cited by 5 publications

References 13 publications

808 nm excited energy migration upconversion nanoparticles driven by a Nd3+–Trinity system with color-tunability and superior luminescence properties

808 nm excited energy migration upconversion nanoparticles driven by a Nd3+–Trinity system with color-tunability and superior luminescence properties

High Repetition Rate Yb:CaF<sub>2</sub> Multipass Amplifiers Operating in the 100-<roman>mJ</roman> Range

Radially and azimuthally polarized laser beams by thin-disk laser

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808 nm excited energy migration upconversion nanoparticles driven by a Nd³⁺–Trinity system with color-tunability and superior luminescence properties

808 nm excited energy migration upconversion nanoparticles driven by a Nd³⁺–Trinity system with color-tunability and superior luminescence properties