Abstract
In order to seek for new Raman crystals, the manuscript presented the discussion on the Raman frequency of α-quartz, β-quartz, as well as Pb4+-doped SiO2 crystals at different temperature and pressure. The results demonstrated that as the pressure increased, the Raman lines shifted towards higher frequency for α-SiO2 crystal, while for β-SiO2 crystals, the main lines moved to lower frequency. Several new peaks were generated from the Pb4+-doped α-SiO2 crystals. The Pb4+-doped β-SiO2 crystals presented strong and ample Raman beams in the low-frequency range. The airfoil-shaped spectra appeared and broadened at high temperature and pressure. It could be inferred that the Pb4+-doped SiO2 crystals were excellent Raman crystal candidates.
Highlights
Raman and Brillouin technology were both famous methods to explore material structure and characteristic by nonlinear frequency conversion [1]
Some were the influence of temperature on the Raman spectrums of α-quartz or β-quartz crystals, some were high-pressure Raman study of SiO2, and some were the α–β transition [11,12]
The terms associated with the plane wave pseudopotential method and the exchange of electron–electron interactions were processed in a generalized gradient approximation (GGA) projection patch (PW91) version
Summary
Raman and Brillouin technology were both famous methods to explore material structure and characteristic by nonlinear frequency conversion [1] In one hand, they could provide quick, simple, repeatable, and more importantly, nondestructive qualitative and quantitative analysis [2], on the other hand, they would extend the range of laser wavelength and greatly promote the development of laser technology, such as solid-state Raman lasers and fiber lasers [3,4,5]. They could provide quick, simple, repeatable, and more importantly, nondestructive qualitative and quantitative analysis [2], on the other hand, they would extend the range of laser wavelength and greatly promote the development of laser technology, such as solid-state Raman lasers and fiber lasers [3,4,5] There was little research which took factors of both temperature and pressure into account at the same time
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