Cross-relaxation and ion clustering in Tm3+:CaF2 crystals

Pavel Loiko; Alain Braud; Lauren Guillemot; Jean-Louis Doualan; Abdelmjid Benayad; Patrice Camy

doi:10.1117/12.2555057

1 April 2020 Cross-relaxation and ion clustering in Tm³⁺:CaF₂ crystals

Pavel Loiko, Alain Braud, Lauren Guillemot, Jean-Louis Doualan, Abdelmjid Benayad, Patrice Camy

Proceedings Volume 11357, Fiber Lasers and Glass Photonics: Materials through Applications II; 113570N (2020) https://doi.org/10.1117/12.2555057
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

We systematically study cross-relaxation (CR) and ion clustering in Tm³⁺:CaF₂ crystals using a spectroscopic approach. For this, the luminescence from the ³H₄ and ³F₄ states was monitored for a broad range of Tm³⁺ doping concentrations, from 0.01 at.% to 7 at.%. The decay curves were fitted using a model of two ions classes, namely isolated ions showing no energy-transfer processes and ions with neighbors exhibiting both CR and energy-transfer upconversion (ETU), and accounting for energy-migration. The fraction of ions with neighbors and the microscopic concentration-independent CR and ETU parameters are deduced. The critical Tm³⁺ doping level for which at least half of the active ions are clustered is only 0.7 at.%. The obtained results are relevant for achieving efficient laser operation of Tm³⁺:CaF₂ crystals at the ³F₄ → ³H₆ (at ~1.9 μm) and the ³H₄ → ³H₅ (at ~2.3 μm) transitions.

Citation Download Citation

Pavel Loiko, Alain Braud, Lauren Guillemot, Jean-Louis Doualan, Abdelmjid Benayad, and Patrice Camy "Cross-relaxation and ion clustering in Tm³⁺:CaF₂ crystals", Proc. SPIE 11357, Fiber Lasers and Glass Photonics: Materials through Applications II, 113570N (1 April 2020); https://doi.org/10.1117/12.2555057

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