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Passive Q-switching of an Er, Yb:glass laser with Co:Mg(Al,Ga)<sub>2</sub>O<sub>4</sub>-based glass-ceramics.
Applied Optics 2017 March 11
Transparent glass-ceramics (GCs) containing Co:Mg(Al,Ga)<sub>2</sub>O<sub>4</sub> nanocrystals (mean diameter of 7-9 nm) are synthesized by heat treatments at 850-950°C from magnesium aluminosilicate glass nucleated by TiO<sub>2</sub> and doped with Ga<sub>2</sub>O<sub>3</sub> and CoO. The GCs exhibit a broadband A<sub>2</sub>4(F4)→T<sub>1</sub>4(F4) absorption due to the Co<sup>2+</sup> ions, low saturation fluence (∼0.5 J/cm<sup>2</sup>), fast recovery time of initial absorption (∼300 ns), and high laser damage threshold (∼20 J/cm<sup>2</sup>). They are used for passive Q-switching of a diode side-pumped Er,Yb:glass laser generating 3.1 mJ/20 ns pulses (peak power, 155 kW) at 1535 nm with a TEM<sub>00</sub> output mode. The Q-switching performance of the Co:Mg(Al,Ga)<sub>2</sub>O<sub>4</sub>-based GCs is compared with that for various Co<sup>2+</sup>-doped GCs and Co:MgAl<sub>2</sub>O<sub>4</sub> single crystal. The prepared GCs are promising for further applications in passively Q-switched Er:YAG and other Er crystalline (or ceramic) lasers.
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