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采用助熔剂法,以CaCl2为助熔剂,生长Cr4+:Ca2GeO4新型近红外可调谐激光晶体.通过X射线衍射(XRD)、激光Raman光谱、X射线光电子能谱(XPS)等方法对晶体进行结构表征.结果表明,得到的晶体为单斜晶系镁橄榄石结构的低温γ-Cr4+:Ca2GeO4单晶,晶格参数为a=5.3209(1=0.1nm),b=6.6648,c=11.2606.Raman光谱测试证实了晶体中存在锗酸根离子,并对其进行了振动归属.XPS分析结果表明晶体中的Cr元素是以Cr4+的形式存在的,不含有其他价态的Cr离子。
A novel near-infrared tunable laser crystal of Cr4 +: Ca2GeO4 was grown by flux method using CaCl2 as a flux, and its crystal structure was characterized by X-ray diffraction (XRD), laser Raman spectroscopy and X-ray photoelectron spectroscopy The results show that the obtained crystal is a low temperature γ-Cr4 +: Ca2GeO4 single crystal with monoclinic forsterite structure with the lattice parameters of a = 5.3209 (1 = 0.1nm), b = 6.6648, c = 11.2606 .Raman spectroscopy confirmed the presence of germanate ions in the crystals and their vibrational assignments. XPS analysis indicated that Cr contained in the crystals existed in the form of Cr4 + and did not contain Cr ions in other valence states.