硼酸盐晶体的结构特征与新材料设计

从硼酸盐晶体的结构出发,综述了硼酸盐的不同分类方法,并在此基础上详细介绍了复杂晶体化学键理论及其在硼酸盐晶体非线性光学性质上的应用.此外,介绍了键合模型及其对硼酸盐晶体结构的预测,提出了从硼酸盐的结构预测到结构分类再到非线性光学效应计算的一体化的硼酸盐晶体材料设计的新思路.     

项目与资本

光电功能晶体 本项目主要是通过熔盐、提拉生长技术生产LBO、BBO晶体、YVO4、Nd:YVO4等晶体并经光学加工,镀膜制成供激光器用的变频元件,光纤通讯用的光隔离器元件及激光器件。 利用激光通过非线性光学晶体对激光波长进行变频制成光参量振荡器,可获得从紫外到红外波长输出的激光光源。其可调谐范围、转换效率、输出功率以及可靠性等方面均优于染料激光器。在激光器中使用LBO、BBO等非线性光学晶体实现了光参量激光器和可见/紫外大功率全固态激光器商品化,推动了激光显示、光信息存储、微电子机械加工、医疗、核能源以及在军事上的应用。 LBO、BBO非线性光学晶体拓宽了激光器的应用领域,由于推广迅速,市场呈快速增长趋势,在短短的几年内形成了一千多万美元的市场规模。随着全固态激光器逐步取代现用的离子激光器,大屏     

硼镀酸盐非线性昌体材料研究取得新发现

获得大的非线性光学系数、合适的双折射率、以及优良的物理化学性能的深紫外非线性光学晶体具有很强的挑战性,碱金属硼酸盐由于其具有优异的深紫外透光性能而成为深紫外非线性光学晶体材料的研究热点。     

科学技术部《中国高新技术产业发展报告》(新材料产业部分)(二)

四、人工晶体 1、非线性光学晶体 我国非线性光学晶体材料处于国际领先地位。当今国际上综合性能优良、有工业应用价值的三种晶体,其中BBO、LBO两种晶体为我国所发现,这导致了国际光参量激光和大功率全固态绿光激光器的产业化并成为激光核能技术的关键材料,推动着光电子技术的发     

透过LBO晶体专利纠纷谈企业知识产权保护

专利金奖光环的黯淡2006年7月，国家知识产权局专利复审委员会（以下简称专利复审委）宣告“用三硼酸锂单晶体制造的非线性光学器件（LBO晶体，专利号88102084．2号）”发明专利权部分无效。LBO晶体发明专利权的权力要求1被无效，在权力要求2至7的基础上维持该发明专利权继续有效。一石激起千层浪，LBO晶体专利宣告部分无效，引起了晶体业界的广泛关注，牵动了不少人的心。孰不知LBO晶体专利是我国材料界在世界材料领域的闪光点，     

固结磨料抛光LBO晶体非水基抛光液优化

三硼酸锂(LBO)晶体是优良的非线性光学晶体材料,抛光后晶体表面水份残留导致晶体潮解,影响器件的使用性能。采用非水基抛光液固结磨料抛光LBO晶体,降低水含量,研究非水基抛光液中去离子水、乳酸、双氧水等含量对材料去除率和表面粗糙度的影响,并综合优化得到高材料去除率和优表面质量的抛光液组分。研究表明,抛光液中去离子水浓度16%、乳酸22%、双氧水5%为最优抛光液组分,采用优化的抛光液固结磨料抛光LBO晶体的材料去除率达到392nm/min,表面粗糙度为0.62nm,实现了LBO晶体表面的高效高质量抛光,同时避免了抛光过程中水的大量使用。     

新型非线性光学晶体 Ca4RO(BO3)3的研究进展

作为新型非线性光学材料,钙－稀土硼酸盐晶体Ｃａ４ＲＯ（ＢＯ３）３（Ｒ－Ｌａ３＋、Ｎｄ３＋、Ｓｍ３＋Ｇｄ３＋Ｙ３＋Ｅｒ３＋、Ｔｂ３＋、Ｌｕ３ ）近来引起了广泛的重视．该系列晶体属非中心对称的单斜晶系,空间群Ｃｍ．本文综述了上述晶体的结构和生长研究的进展。总结了晶体的线性光学／非线性光学性能以及掺杂晶体的激光自倍频性能,指出这些晶体在非线性光学领域潜在的应用前景．     

新型非线性光学晶体Ca4RO(BO3)3的研究进展

作为新型非线性光学材料,钙－稀土硼酸盐晶体Ｃａ４ＲＯ（ＢＯ３）３（Ｒ－Ｌａ＾３＋、Ｎｄ＾３＋、Ｓｍ＾３＋、Ｇｄ＾３＋、Ｙ＾３＋、Ｅｒ＾３＋、Ｔｂ＾３＋、Ｌｕ＾３＋）近来引起了广泛的重视,该系列晶体属非中心对称的单斜晶系,空间群Ｃｍ。本文综术字上述晶体的结构和生长研究的进展,总结了晶体的线性光学／非线性光学性能以及要晶体的激光自倍频性能,指出这些晶体在非线性光学领域潜在的应用前景。     

LBO晶体的超精密加工工艺研究

采用Logitech PM5精密研抛机,通过机械抛光和化学机械抛光方法超精密加工LBO晶体;详细研究了LBO晶体的超精密加工工艺,并观察研磨和抛光等加工过程后的晶体表面形貌;研究抛光液和抛光垫在抛光中对LBO晶体表面微观形貌的影响.使用Wkyo激光干涉仪测量平面度,光学显微镜观察表面宏观损伤,原子力显微镜测量表面粗糙度和观察微观形貌.通过实验,实现高效率、高精度、高质量的LBO晶体的超精密加工,得到了LBO晶体的超精密加工工艺;超精密加工后晶体的表面粗糙度＜0.2nm RMS,表面平面度＜氇/10(氇=633nm),微观损伤少.     

玻璃光学碱度与三阶非线性光学极化率

介绍了玻璃光学碱度的概念,讨论了玻璃光学碱度与三阶非线性光学极化率之间的变化规律,分析了二元硼酸盐、硅酸盐、锗酸盐、碲酸盐、钛酸盐玻璃系统中光学碱度与三阶非线性光学极化率之间变化的定性趋势和定量方程,总结了玻璃光学碱度的本质及其影响,对进一步研究不同玻璃系统中光学碱度与三阶非线性光学极化率之间定量关系的趋势进行了展望.     

Proton and gamma radiation tests on nonlinear crystals

We report on the results of proton and gamma irradiation tests performed on nonlinear crystals for second- (SHG) and third-harmonic generation. Beta-barium borate (BBO), lithium triborate (LBO), and KTP crystals were exposed to three different energies of proton radiation (8, 70, and 300 MeV) and incremental doses of gamma radiation (up to 139 krad) in order to investigate the change in SHG performance and transmission spectra. BBO and LBO crystals turned out to be a suitable choice for SHG under radiative conditions.     

Li2B4O7材料制备及性能的研究

采用Cz法生长出优质的Li2B4O7(LBO)单晶 ,开展了压电性能及应用的研究,同时用Maker条纹测量了晶体的二次谐波系数d31 和d33.用温梯法制备了LBO微晶玻璃,开展了热激发电子发射(TSEE)性能的研究.     

Li2B4O7晶体的比热,导温和导热性能

用ＤＳＣ和激光热导人义分别测定了Ｌｉ２Ｂ４Ｏ７（ＬＢＯ）晶体３５０－９７０Ｋ范围内的比热和６３０－９７０Ｋ范围内不同主晶轴方向的导温系数，并由此了导热系数和声子平均自由程。     

可调蓝光皮秒脉冲

利用３５１ｎｍ紫外光泵浦非临界相位匹配ＬｉＢ３Ｏ５光参量振荡器（ＬＢＯ－ＯＰＯ）,直接获得了在４７２￣４５３ｎｍ范围内波长连续可调的蓝图光皮秒脉冲序列。ＯＰＯ所用ＬＢＯ晶体的两端面切割成Ｂｒｅｗｓｔｅｒ角,避开了晶体表面增透膜的稳定性问题,保证了ＬＢＯ晶体端面低反射损耗和ＯＰＯ长期稳定工作。     

Optimization of Polishing Parameters with Taguchi Method for LBO Crystal in CMP

Chemical mechanical polishing(CMP)was used to polish Lithium triborate(LiB3O5 or LBO)crystal.Taguchi method was applied for optimization of the polishing parameters.Material removal rate(MRR)and surface roughness are considered as criteria for the optimization.The polishing pressure,the abrasive concentration and the table velocity are important parameters which influence MRR and surface roughness in CMP of LBO crystal.Experiment results indicate that for MRR the polishing pressure is the most significant p...     

Physicochemical properties of organic nonlinear optical crystal for frequency doubling: Glycine acetamide

Non-linear optical (NLO) crystal of glycine acetamide (GA) is synthesized and grown in aqueous solution by slow evaporation technique. The cell parameters of the grown crystal are identified from single crystal XRD and the functional groups are confirmed in vibrational analysis. Temperature dependence of the material is probed using TGA/DTA. Mechanical strength of the grown material is tested by Hardness studies. UV-VIS-NIR spectral study explains the transmission ability of the crystal in visible range also the photoluminescence spectrum explains the transition mechanism of ions. The NLO activity of the crystal is confirmed by Kurtz power technique.     

Diode-end-pumped,electro-optically Q-switched Nd:YVO4 slab laser and its second-harmonic generation

We describe the operation of a near-diffraction-limited, 1,064-nm electro-optically Q-switched Nd:YVO4 slab laser that is end pumped by laser-diode stacks and its efficient second-harmonic generation by using a lithium triborate (LBO) crystal. The energy per pulse of 3.6 and 0.8 mJ and pulse widths of 5 and 13.5 ns were obtained at repetition of 5 and 40 kHz, respectively. With a LBO crystal, a maximum output power of 15.6 W at 532 nm was obtained at the repetition rate of 40 kHz, the corresponding conversion efficiency was 60%, and the pulse width was 11.3 ns. At 10 kHz, the pulse energy of 532 nm was 1.2 mJ, and the pulse width was 5 ns.     

Growth and characterization of an organic nonlinear optical crystal: Glycinium trichloroacetate

Single crystal of glycinium trichloroacetate, an organic nonlinear optic (NLO) material, has been grown by slow solvent evaporation technique at room temperature. The grown crystal was subjected to single crystal X-ray diffraction for confirming the coordination formed, and the presence of various functional groups was studied by FTIR in the range 4000–450 cm⁻¹. UV–Visible transmittance studies were performed to analyze optical transparency of the crystal and second harmonic generation was investigated to explore the NLO property of the material. Thermogravimetric and differential thermal analysis have been performed to study thermal properties of the grown crystal. Dielectric constant and dielectric loss were studied at different temperatures and frequencies. Vicker's microhardness testing was carried out on the as grown crystal to reveal the mechanical properties of the crystal. Etching studies were made on the as grown crystal to analyze the structural imperfection of the crystal.     

Efficient continuous-wave ultraviolet generation in LiB3O5 and RbD2AsO4

We have demonstrated two continuous-wave nonlinear processes: third-harmonic generation (THG) of 1064-nm radiation with a lithium triborate (LBO) crystal, and second-harmonic generation of 696-nm radiation in deuterated rubidium dihydrogen arsenate. With 34 mW of 1064-nm and 25 mW of 532-nm radiation incident upon the LBO crystal, as much as 60 nW of third-harmonic power has been produced. We present the characteristics that optimize the production of nonlinear power in this sum-frequency generation process. In the second experiment, 15 nW of radiation at 348 nm was produced with 9 mW of 696-nm incident radiation. Both processes will play an important role in the new generation of optical synthesis techniques.