20 February 2015 Radiation tests on erbium-doped garnet crystals for spaceborne CH4-Lidar applications
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A test campaign for assessing the radiation hardness of different Erbium-doped garnet crystals including Er:YAG and a compositionally tuned Er:YAG/Er:LuAG mixed garnet is reported. Tests with proton and gamma radiation have been performed with parameters mimicking a 3-year low-earth-orbit satellite mission like MERLIN or ADM-Aeolus. For each test sample broadband transmission spectra in the wavelength range of 500 nm – 1700 nm and characteristic laser curves from a test laser oscillator have been measured. Radiation-induced losses have been calculated from the obtained data. The results indicate that gamma radiation is the dominant loss source with about 0.5 %/cm radiation-induced losses for the nominal dose of the chosen mission scenario.
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Ansgar Meissner, Martin Kreitler, Miroslaw Cubera, Philipp Kucirek, Bastian Gronloh, Dominik Esser, Marco Höfer, Hans-Dieter Hoffmann, "Radiation tests on erbium-doped garnet crystals for spaceborne CH4-Lidar applications", Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 93420H (20 February 2015); doi: 10.1117/12.2076122; https://doi.org/10.1117/12.2076122


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