Preparation,Structure And Optical Properties Of Novel Ga₂S₃-Sb₂S₃-CsI/CsBr Chalcohalide Glasses

With the rapid development of mid-infrared?MIR?technology,chalcogenide and chalcohalide glasses have been much attention.Due to wide infrared transparent window,high refractive index and low phonon energy,they are considered as promising MIR transmitting,nonlinear photonics materials and excellent host materials for MIR lasers.In this paper,we prepared novel Ga₂S₃-Sb₂S₃-CsI and Ga₂S₃-Sb₂S₃-CsBr chalcohalide glasses based on the Ga₂S₃-Sb₂S₃ chalcogenide glass.The glass forming,structure,thermal and optical properties weresystematically investigated.The major work and obtained results are described as follows:?1?Novel Ga₂S₃-Sb₂S₃-CsI chalcohalide glasses were prepared.It has a glass-forming domain composed of 0³5mol%Ga₂S₃,15⁹5mol%Sb₂S₃ and0⁵5mol%CsI.The glasses have a wide transparent window of 0.7¹3.5?m,high third-order nonlinear refractive indices of 1.7⁸.7×10^-14cm²/W@1.55?m,relatively short zero group-velocity-dispersion wavelengths of 3.8⁵.15?m.Moreover,these glasses can dissolve a large number of rare earth ions(such as Dy³⁺,>2mol%).These superior properties demonstrate their good potentials for mid-infrared application such as thermal imaging,nonlinear photonics and mid-infrared laser.?2?Based on the previous research of Ga₂S₃-Sb₂S₃-CsI glasses,the mid-infrared luminescent properties of Dy³⁺ions in a new chalcohalide glass host were systematically investigated.The Dy³⁺-doped chalcohalide glasses exhibit good thermal stability??T>100??and low phonon energy(³07 cm^-1).The 2.96?m and4.41?m have intense MIR emissions under 1.32?m excited.These emissions show quantum efficiencies???as high as⁶0%,and have relatively large stimulated emission cross sections(?_em).These favorable thermal and emission properties make the Dy³⁺-doped Ga₂S₃-Sb₂S₃-CsI glasses promising materials for MIR fiber amplifiers or lasers.?3?New Ga₂S₃-Sb₂S₃-CsBr chalcohalide glasses were prepared.The glass forming domain was determined which composed of 20⁴0mol%Ga₂S₃,10⁸0mol%Sb₂S₃ and 0⁶0mol%CsI.The mainly structure of Ga₂S₃-Sb₂S₃-CsBr chalcohalide glass are consisted of[GaS₄]tetrahedron,[SbS₃]vertebra and[S₃Ga-GaS₃]ethane-like structural units.After CsBr is added to Ga₂S₃-Sb₂S₃ chalcogenide glass,the Br^-ions play a role of terminator which repalce a part of bridge sulfur bond,and form[GaS₃Br]structure unit.The Cs⁺ions play the role of the charge compensator.The glasses show the densities are 3.52³.97g/cm³,the refractive indices are1.946².579?@10?m?and wide transparent window of 0.6¹4?m.These results show a good potential application in the thermal imaging.