Spectroscopic characterization of Ti3+:AgGaS2 and Fe2+:MgAl2O4 crystals for mid-IR laser applications

Rose K. Sackuvich; Jeremy M. Peppers; NoSoung Myoung; Valery V. Badikov; Vladimir V. Fedorov; Sergey B. Mirov

doi:10.1117/12.909156

15 February 2012 Spectroscopic characterization of Ti³⁺:AgGaS₂ and Fe²⁺:MgAl₂O₄ crystals for mid-IR laser applications

Rose K. Sackuvich, Jeremy M. Peppers, NoSoung Myoung, Valery V. Badikov, Vladimir V. Fedorov, Sergey B. Mirov

Proceedings Volume 8235, Solid State Lasers XXI: Technology and Devices; 823520 (2012) https://doi.org/10.1117/12.909156
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.909156

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