Preparation And Mid-infrared Spectra Analysis Of Rare Earth Doped Ga-Sb-S Chalcogenide Glass

The mid-infrared laser can be used in many fields such as real-time distance sensing, remote detection and military interference. Rare earth ions doped glass with semiconductor laser pumped is an effective way to obtain mid-infrared luminescence. Classification chalcogenide glass and their characteristics was summarized in this paper. The research progress about rare earth doped chalcogenide glass and critical factor for mid-infrared emission was also listed in this paper.First,series of GaxSb_40-xS₆₀ chalcogenide glasses were synthesized by a melt-quenching method. The thermal and optical properties of sample glasses were determined by the Archimedes principle, X-ray diffraction, thermal expansion, ultra violet-visible-near infrared absorption spectroscopy, and Fourier transform infrared spectroscopy, respectively. The structures of the samples with different compositions were analyzed by Raman spectroscopy. The results of experiment and analysis show that all of the glasses provides optimum thermal stability and well spectral properties. The density decreases slightly, the glass transition temperature improves, and the thermal expansion coefficient reduces with increasing the content of gallium. The relationship between optical properties and the structure in the chalcogenide glasses was summarized.Then, Er³⁺ ions were doped into Ga-Sb-S series chalcogenide glasses as luminescent centers to research the luminescence properties. Incorporation of Ga in the Ga-Sb-S glass matrix induced the dissociation of [SbS₃] pyramids units in behalf of the formation of tetrahedral [GaS₄] units. And continued introduction of Er³⁺ into the glass forms more Er-S bonds through the further aggregation surrounding the [GaS₄] units. In order to enhance the mid infrared emissions at 2740 nm of Er³⁺, Pr³⁺ was introduced into the glass system. Under 808 nm excitation, the emission of 2740 nm was significantly enhanced in the co-doped sample while the emission of 1550 nm was oppositely reduced. Fluorescence decay results indicated that the lifetime of Er³⁺: 4I13/2 at 1550 nm was evidently decreased in the co-doped sample. The mechanism of the energy transfer process between Er³⁺ and Pr³⁺ ions were investigated in this work.At last the haloid ?XI, X=Cs, Ag, Pb? was also introduced into the glass and this chalcohalide glass was investigated by optical, thermal, fluorescence and other properties. Changes about local environment around rare earth was discussed in detail through Judd-Ofelt parameters calculated by optocal density. Ending with summarizing on the research material in this paper for potential application and the future prospect in this field.