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4 October 2000 Er3+- and Yb3+-doped YAG crystals for eye-safe laser systems
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There is considerable interest in compact pulsed high peak power laser sources emitting at wavelengths near 1.55 micrometers . Rangefinders and other applications with free space propagation could be strongly benefit of such devices. The wavelength of around 1.55 micrometers is in the eyesafe regime where significantly higher pulse energies can be used without damaging human eyes. Erbium and ytterbium doped YAG single crystals were obtained by the Czochralski method. The basis conditions of growth and the results of optical homogeneity measurements of the obtained crystals are presented. Absorption spectra of these Er3+- and Yb3+-doped YAG crystals were measured in the spectral range 190 divided by 5000 nm at room temperature. Excitation and luminescence spectra were also recorded at room temperature with a JOBIN-YVON spectro fluorometer using a diode laser as an excitation source. The measurements of the lifetime of the Er3+ ions in the upper laser level of the samples were made by the direct method with pulse excitation.
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Zygmunt Mierczyk, Krzysztof Kopczynski, Andrzej Gietka, Tadeusz Lukasiewicz, Zygmunt Frukacz, and Marek Swirkowicz "Er3+- and Yb3+-doped YAG crystals for eye-safe laser systems", Proc. SPIE 4237, Laser Technology VI: Progress in Lasers, (4 October 2000);

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