Formation and Properties of GeSe₂–Ga₂Se₃–PbI₂ Novel Chalcohalide Glasses

Abstract

The glass-forming region of the GeSe 2 -Ga 2 Se 3 -PbI 2 system was determined and homogeneous glasses were prepared. The maximum dissolvable PbI 2 can be up to 50 mol%. The structures of glasses were characterized by Raman spectroscopy. The thermal, optical, and some basic physical properties of the glasses were investigated. The results show that GeSe 2 -Ga 2 Se 3 -PbI 2 glasses have a wide region of transmission window (0.7-16 lm) and high refractive index (B2.5) with the addition of PbI 2 . The glasses have good glass-forming ability and high glass transition temperatures. Consequently, these novel glasses may be promising candidate materials for infrared optics and nonlinear optical field. P. Lucas-contributing editorThis work was financially supported by China's manned space program (the 921-2.1 project).

Formation, Microstructure, and Conductivity of a Novel Ga2S3-Sb2S3-AgI Chalcogenide System

“…A large glass-forming region provides a wide compositional flexibility to optimize properties and conductivities. A previous research on similar chalcogenide glass systems 20,21 indicated that the introduction of AgI to Ga 2 S 3 -Sb 2 S 3 can improve glass-forming ability and ionic conductivity because of the formation of [GaS 4−x I x ] structure units and a large amount of Ag + , respectively. For series B, when the AgI content is fixed at 60 mol%, with respect to the Sb 2 S 3 -Ga 2 S 3 component, the ratio of Sb/Ga is not flexible, and the glass likely crystallizes at a high Ga content.

Figure 1Glass-forming region of the Ga 2 S 3 -Sb 2 S 3 -AgI system.

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Third-order nonlinear optical properties of GeSe2–Ga2Se3–PbI2 glasses

“…According to the previous research, the (1 À 2x)GeSe 2 -xGa 2 Se 3 -xPbI 2 (x= 0.05, 0.10, 0.15, 0.20, 0.25) glasses had good glass-forming ability and presented suitable thermo-mechanical properties for optical fiber drawing [9]. Fig.…”

“…It distinctly indicates almost no absorption at the laser operated wavelength of 1064 and 800 nm. In fact, the glass system has a high transparency window in the entire 0.7-16 mm spectral region [9]. From Fig.…”

“…The other shoulder at lower wavenumber, 174 cm À 1 , originates from the [Se 3 Ge-GeSe 3 ] and [Se 3 Ga-GaSe 3 ] vibrations. The 110 cm À 1 band can be assigned to the vibrations of Pb-I bonds in [PbI n ] units [9]. In order to evaluate the variation of Raman bands, the intensities of the bands are normalized to that of the 202 cm À 1 band.…”

“…Furthermore, we investigate ultra-fast response time of typical 0.40GeSe 2 -0.20Ga 2 Se 3 -0.40PbI 2 glass by use of the femtosecond time-resolved optical Kerr effect. The glasses were prepared with high pure element (Ge, Ga, and Se, all of 99.999% purity, PbI 2 of 99.9% purity) by conventional melt quenching method, which can be found elsewhere [9]. These raw glasses were cut into thin pieces with a thickness of 0.8 mm and the surfaces were polished to optical quality.…”