Influence of interionic energy transfer mechanisms in Tm,Ho:YAG on the maximum extractable energy in regenerative amplifiers

Ramon Springer; Tyndale Hannan; Christoph Pflaum

doi:10.1117/12.2306235

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17 May 2018 Influence of interionic energy transfer mechanisms in Tm,Ho:YAG on the maximum extractable energy in regenerative amplifiers

Ramon Springer, Tyndale Hannan, Christoph Pflaum

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Proceedings Volume 10683, Fiber Lasers and Glass Photonics: Materials through Applications; 106832K (2018) https://doi.org/10.1117/12.2306235
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

The numerical simulation of a regenerative amplifier based on codoped Tm,Ho:YAG is presented. Within this work, a maximum pulse energy of 3.1 mJ is observed for 0.9 kW CW end-pumping at 785 nm. The simulation results demonstrate that interionic mechanisms such as upconversion and energy transfer significantly influence the population of states and consequently, the amplification. In detail, the most dominant mechanisms are identified by introducing the rate term k_xN_iN_m as a quantity to compare the strength of all occuring interionic mechanisms. It can then be shown that the energy transfer mechanism E₆₅₁₂ between Holmium and Thulium ions is the greatest source of population loss for the upper lasing state ⁵I₇ in Holmium. In summary, the presented model represents an efficient tool to characterize the influence of interionic mechanisms on the extractable energy in solid-state media under pulsed operation.

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Ramon Springer, Tyndale Hannan, and Christoph Pflaum "Influence of interionic energy transfer mechanisms in Tm,Ho:YAG on the maximum extractable energy in regenerative amplifiers", Proc. SPIE 10683, Fiber Lasers and Glass Photonics: Materials through Applications, 106832K (17 May 2018); https://doi.org/10.1117/12.2306235

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