排序方式: 共有27条查询结果,搜索用时 15 毫秒
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采用一种全新的ADP晶体生长方法,使晶体首先恢复其理想外形,实现晶体的全方位生长,从而提高晶体的生长速度。并对所得晶体进行了透过率,激光散射,摇摆曲线测试及热重差热分析,与常规生长方法比较并分析了全方位生长方法的优势。 相似文献
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含钡硫铝酸钙晶体的合成及其结构和形态 总被引:22,自引:0,他引:22
以CaCO3,Al2O3,BaSO4和CaSO4*2H2O为原料,在1350℃加热合成C(4-x)BxA3粉晶,然后以PbCl2为助熔剂,借助于熔盐法制备了含钡硫铝酸钙单晶,在对其粉晶X射线多晶衍射谱指标化的基础上,以高纯Si作内标测定了C(4-x)BxA3(x=0.25,0.5,0.75,1.00)晶体属等轴晶系,立方体心晶格,晶胞参数分别为a0=9.280, 9.233, 9.261和9.303nm,与其成分变化成直线关系,符合Vegard定律.电镜观察该晶体外形为菱形十二面体.并分析了该晶体的红外光谱,认为在该晶体中存在着[AlO4]四面体. 相似文献
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采用顶部籽晶法, 生长了掺钕的新型非线性光学晶体Nd:BiB3O6, 测量了该晶体的折射率, 并拟合了晶体的折射率色散参数. 同时还测量了晶体的室温吸收谱, 并与0.2 mol/L的 NdCl3溶液的室温吸收谱进行了分析比较. 根据Judd-Ofelt理论, 拟合出晶体场唯象强度参数: Ω2 = 0.1776 × 10-20, Ω4 = 0.1282 × 10-20, Ω6 = 0.1357 × 10-20 cm2. 计算了各能级的辐射跃迁几率AJ,J', 荧光辐射寿命τ, 荧光分支比βJ', 振子强度fJ,J'等. 根据这些光学参量, 讨论了该晶体的部分性能和应用前景. 相似文献
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硒酵母中硒含量测定方法的研究 总被引:20,自引:2,他引:18
报道了人工培养硒酵母中总硒、无机硒和有机硒的测定方法,建立了无机硒和有机硒的鉴别方法,并采用透析处理法使硒酵母中的无机硒和有机硒得以分离;还报道了不同培养条件下得到的5种硒酵母中总硒、无机硒和有机硒的定量分析数据,为硒酵母在医药和添加剂领域的应用提供了可靠的数据。 相似文献
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Transparent Nd : BiB3O6 crystal has been grown by top-seeded method. The refraction indices of the crystal were measured and the parameters of chromatic dispersion were fitted. The room temperature absorption spectra of the crystal have been measured and compared with that of 0.2 mol/L NdCI3 solution. According to Judd-Ofelt (JO) theory, the spectral strength parameters Ω2 = 0.1776×10-20 cm2, Ω4 = 0.1282×10-20 cm2 and Ω6 = 0.1357×10-20 cm2 of Nd3+ ion were fitted. The radiative transition probabilities AJ,(?), oscillator strengths fJ,(?), radiative lifetime T and the branching ratio β(?) have all been calculated. Based on these parameters, the properties and application perspective are discussed. 相似文献
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飞秒激光在军事、医学、通讯、加工等领域有着重要应用,已经成为新世纪激光技术领域的研究热点。得益于激光二极管(LD)的快速发展,以LD作为泵浦源成为新型全固态飞秒激光器的发展趋势。Yb^3+离子掺杂的激光晶体材料因其独特的能级结构、宽带吸收与发射等优势,逐渐成为LD直接泵浦并实现1.0μm飞秒激光输出的重要增益介质。详细总结了当前掺Yb^3+飞秒激光晶体的研究进展,分析了目前存在的主要问题,给出了未来飞秒激光晶体发展的两个建议方向:高效率小功率飞秒激光和大功率高能量飞秒激光。以Yb^3+:Sr3Y2(BO3)4晶体为例,详细研究了其晶体生长、光谱、连续与飞秒激光性能,并实现了中心波长在1060 nm处脉宽为116 fs,平均输出功率为1.08 W,光光转换效率为33.1%的高效率飞秒激光输出,表明Yb^3+:Sr3Y2(BO3)4及其同体系晶体是一类优异的高效率飞秒激光材料。 相似文献
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Lasing properties of a Yb ion in tetragonal LuPO_4 and LuVO_4 isomorphic crystals: A comparative study 下载免费PDF全文
A comprehensive investigation is carried out to compare the spectroscopic properties, absorption saturation behaviors and lasing properties of a Yb ion in tetragonal LuPO_4 and LuVO_4 isomorphic crystals. Significant distinctions are revealed in many aspects of the lasing behavior for the Yb ion doped in the two crystal hosts, and Yb:LuPO_4 proves to be superior to Yb:LuVO_4 since it enables efficient laser action to be much more easily achieved. With a 0.6 mm thick crystal plate of Yb:LuPO_4, an output power of 3.30 W can be generated with an optical–optical conversion efficiency of 50.8%; whereas with a 2 mm long miniature crystal rod, the output power produced can reach 8.35 W with an optical–optical conversion efficiency of 46.7%. 相似文献