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15 February 2012 Spectroscopic characterization of Ti3+:AgGaS2 and Fe2+:MgAl2O4 crystals for mid-IR laser applications
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Mid-IR lasers based on Cr2+ and Fe2+ ions in II-VI tetrahedral crystal hosts have been proven useful as tunable solid-state lasers operating over the 1.9-6 μm spectral range. However, the development of new effective gain media promising for lasing over 3-4 μm and with wavelengths longer than 6 μm is still under progress. In this paper we report spectroscopic characterization of Titanium doped AgGaS2 and Iron doped MgAl2O4 crystals with coordination number four. Polarized absorption and luminescence spectra of titanium doped AgGaS2 crystals were measured at room and low temperatures. It was shown that Ti ions in the AgGaS2 crystal were in both 1+ and 3+ valence states substituting silver and gallium sites, correspondingly. Ti3+ ions in AgGaS2 and Fe2+ in MgAl2O4 crystals feature broad absorption bands with a maximums near 2μm. These ions have no second excited state absorption bands and could potentially be used as effective saturable absorbers for passive Q-switching of 2.1 μm holmium laser cavities. Broad emission covering the 3-6 μm spectral range was observed under 1.9 μm excitation into Ti3+ absorption band. A luminescence signal between 3 and 6 μm was also observed in the Fe:MgAl2O4 crystal.
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Rose K. Sackuvich, Jeremy M. Peppers, NoSoung Myoung, Valery V. Badikov, Vladimir V. Fedorov, and Sergey B. Mirov "Spectroscopic characterization of Ti3+:AgGaS2 and Fe2+:MgAl2O4 crystals for mid-IR laser applications", Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 823520 (15 February 2012);

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