Efficiency optimization of 3-µm Q-switched lasers based on Er-doped crystalline materials

Nikolay Ter-Gabrielyan; Viktor Fromzel

doi:10.1117/12.2546957

16 March 2020 Efficiency optimization of 3-µm Q-switched lasers based on Er-doped crystalline materials

Nikolay Ter-Gabrielyan, Viktor Fromzel

Proceedings Volume 11259, Solid State Lasers XXIX: Technology and Devices; 112590A (2020) https://doi.org/10.1117/12.2546957
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

We show that efficiency, average power and thermal loading of Er-doped 3 μm Q-switched lasers can be significantly improved by enabling free-running upper- and lower cascade lasing at the ⁴S_3/2 → ⁴I_9/2 and the ⁴I_13/2 → ⁴I_15/2 transitions. Using Er:YLF as an example, we numerically and experimentally demonstrate, how overall performance of the cascade laser depends on Er concentration and pumping regimes. The best results were obtained with 1% of Er-doping of YLF. While the influence of the lower cascade (1.62 μm) vanishes after ~ 2% of Er³⁺, the upper cascade (1.73 μm) continues to provide some thermal relief even at very high Er-doping level The experimental results with 1% and 2% of Er-doped YLF, based in a split-channel cavity supporting cascade-assisted Q-switching, are in a good agreement with conclusions of theoretical modeling.

Citation Download Citation

Nikolay Ter-Gabrielyan and Viktor Fromzel "Efficiency optimization of 3-µm Q-switched lasers based on Er-doped crystalline materials", Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 112590A (16 March 2020); https://doi.org/10.1117/12.2546957

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KEYWORDS

Q switches

Q switching

Erbium

Quantum cascade lasers

Crystals

Q switched lasers

Laser crystals

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