Theoretical and experimental investigation on an Er3+:YAG solid-state heat-capacity laser

Marc Eichhorn

doi:10.1117/12.816598

30 April 2009 Theoretical and experimental investigation on an Er³⁺:YAG solid-state heat-capacity laser

Marc Eichhorn

Proceedings Volume 7325, Laser Technology for Defense and Security V; 732502 (2009) https://doi.org/10.1117/12.816598
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

The laser performance of a resonantly pumped Er³⁺:YAG solid-state heat-capacity laser (SSHCL) as an eye-safe high-power laser was investigated experimentally and theoretically using a new analytical quasi-three-level laser model as well as a fully numerical thermo-optical model. While the analytical model is based on a new spectral theory that can predict the thermal evolution of the peak absorption and emission cross-sections for pump and laser transition in a simple mathematical form, the numerical model takes into account the full spatially resolved temperature dependence of the most important parameters of the gain medium like thermo-mechanical parameters (e.g. heat conduction and specific heat), spectroscopic and multiphonon-relaxation lifetimes of the first four manifolds and the full spectrally resolved information of emission and absorption (⁴I_15/2 ↔ ⁴I_13/2) as well as exited-state absorption and re-emission (⁴I_13/2 ↔⁴I_9/2). In the experiments up to 76 W of peak output power could be achieved with a slope efficiency of 39%. The laser could be operated for about 2 s with an integrated output energy of 55 J, currently limited by the available pump power with respect to the temperature-dependent threshold. Cavity parameters like internal losses (approximately 3.6%) and a mode-fill efficiency of up to 79% were also derived as well as the effective medium energy storage lifetime caused by fluorescence radiation trapping. The experimental data are compared with the models of the diode-pumped Er3+:YAG SSHCL with good agreement.

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Marc Eichhorn "Theoretical and experimental investigation on an Er³⁺:YAG solid-state heat-capacity laser", Proc. SPIE 7325, Laser Technology for Defense and Security V, 732502 (30 April 2009); https://doi.org/10.1117/12.816598

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KEYWORDS

Luminescence

Absorption

Crystals

Thermal modeling

Laser crystals

Upconversion

Data modeling

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