（Cr,Ca）：YAG晶体的生长和Cr^4＋的分布

采用中频感应加热引上法，生长了（Ｃｒ，Ｃａ）：ＹＡＧ可调谐激光晶体，温度了Ｃｒ＾２＋的吸收特性，分析了Ｃｒ６４＋在晶体中的几种分布和形成机理。     

掺Nd^3＋的[Y（Ca）]3[Al（Zr）]5O12石榴石单晶光纤的生长和光谱

用激光加热基座法（ＬＨＰＧ）从粉末直接生长单晶光纤并对光谱作了研究。结果表明：ＬＨＰＧ法生长出来的单晶光纤可替代大块晶体去研究光谱等性能；Ｃａ＾２＋和Ｚｒ＾４＋等量同时掺入到Ｎｄ：ＹＡＧ晶体中，其吸收谱与Ｎｄ：ＹＡＧ基本相同，但荧光分支比和荧光衰减规律发生显著变化。此外还探讨了Ｃａ＾２＋，Ｚｒ＾４＋影响的原因。     

掺杂Cr2O3,MgO对C4A3形成及水化性能影响的研究

研究了掺杂Ｃｒ２Ｏ３，ＭｇＯ对Ｃ４Ａ３＾－Ｓ矿物形成及水化性能的影响。结果表明，在１３００℃保温１ｈ的煅烧条件下，掺加一定量的ＭｇＯ能促进Ｃ４Ａ３＾－Ｓ的形成，而Ｃｒ２Ｏ３则有稳定过渡产物ＣＡ的作用，从而减慢Ｃ４Ａ３＾－Ｓ的形成速率；在１３００℃保温３ｈ的煅烧条件下，掺中Ｃｒ２Ｏ３，ＭｇＯ均能使Ｃ４Ａ３＾－Ｓ的形成量增加。掺杂使Ｃ４Ａ３＾－Ｓ晶体主要以四方晶系的结构形式存在。在本实验条件下，掺杂可     

发光晶体NaTm（WO4）4的光谱性质及光谱参数

在已获得Ｔｍ＾３＋在Ｎａ５Ｔｍ（ＷＯ４）４晶体中强度参数Ωλ（λ＝２，４，６）的基础上，根据Ｊｕｄｄ－Ｏｆｅｌｔ理论，计算了Ｔｍ＾３＋多重量激发态之间的辐射跃迁几率、辐射寿命，荧光分支比及积分发射截面等光谱参数，并对晶体实现激光输出的可能性进行了讨论。     

Cr3+:LiCaAlF6晶体提拉法生长的研究

在国内首次报道熔体提拉法生长Ｃｒ＾３＋：ＬｉＣａＡｌＦ６晶体的研究。晶体生长工艺中不用ＨＦ流动气氛的铂金炉膛。研究出质量较好的尺寸达Φ（２０－２５）ｍｍ×（９０－１２０）ｍｍ的晶体。测定晶体对８０９ｎｍ红外波段的吸收关系数μ为１０＾－２量级，晶体中无ＯＨ＾－，对于熔体的富Ｌｉ组成，ＣｒＦ３对氧化作用的敏感以若干晶体缺陷生长工艺的关系等方面进行了讨论。     

(Cr,Ca)∶YAG晶体的生长和Cr~(4+)的分布

采用中频感应加热引上法，生长了（Ｃｒ，Ｃａ）∶ＹＡＧ可调谐激光晶体，测试了Ｃｒ４＋的吸收特性，分析了Ｃｒ４＋在晶体中的几何分布和形成机理。     

垂直Bridgman法生长Cr^3^＋：LiCaAlF6的研究

用垂直Ｂｒｉｄｇｍａｎ法从化学计量比组份的熔体中长出Ｃｒ＾３＾＋：ＬｉＣａＡｌＦ６单晶。采用封闭式坩埚和液封技术有效地抑制了熔体的挥发和环境中微量氧的污染。生长参数为：生长速度０．７ｍｍ／ｈ，生长温度８７０℃，气氛Ａｒ。同时借助于光学湿微镜，扫描电镜，Ｘ射线能谱及波谱对晶体中的显微缺陷进行了观察和分析。对Ｃｒ＾３＾＋：ＬｉＣａＡｌＦ６晶体的吸收光谱和发射光谱进行了测试。此外，通过红外吸收光谱发...     

含Ba,Sr硫铝酸盐彩色水泥中Cr离子的微观状态及显色特性

应用ＸＰＳ，光谱学方法，研究了着色Ｃｒ离子在硫铝酸盐熟料矿物及其水化浆体中的微观状态和显色特性。结果表明，Ｃｒ离子能使含Ｂａ，Ｓｒ硫铝酸盐矿物呈黄色；Ｃｒ离子在不同的硫铝酸盐矿物中价态分布大不相同。在３ＣＡ．ＣａＳＯ４中主要是Ｃｒ＾６＾＋，Ｃｒ＾５＾＋和Ｃｒ＾４＾＋；在３ＣＡ．ＢａＳＯ４中则以Ｃｒ＾５＾＋和Ｃｒ＾４＾＋为主；而在３ＣＡ．ＳｒＳＯ４中，Ｃｒ离子各价态分布分散，以Ｃｒ＾５＾＋最多。...     

Fe^3＋,Al^3＋,Mg^2＋对石膏结晶习性影响的研究

本文在ＭＳＭＰＲ结晶器中研究了无Ｆ存在下，Ｆｅ＾３＋、Ａｌ＾３＋、Ｍｇ＾２＋三咱离子共存时对石膏结晶习性的影响，结果发现，无论硫酸根过量２．４％还是过量４．８％，Ｆｅ＾３＋、Ａｌ＾３＋、Ｍｇ＾２＋共存得到的石膏晶体几乎都是针状晶体；当硫酸另两种相应的离子浓度保持一定水平时，增大Ｆｅ＾３＋含量，石膏晶体变长；增长Ｍｇ＾２＋含量，石膏晶体变小；增长Ａｌ＾３＋含量，石膏晶体长大，Ｆ与Ａｌ＾３＋同时存在     

海泡石对金属离子的吸附作用及再生性研究

研究了活化海泡石对废水中Ｐｂ＾２＋，Ｃｒ＾３＋，ＣｒＯ＾２－４离子的吸附作用，活化条件对吸附性能的影响，并对海泡石再生利用的可能进行了探讨。     

激光二极管泵浦Nd:NaY(WO4)2晶体的激光性能

采用提拉法生长了平均尺寸为φ25 mm×50 mm的掺钕钨酸钇钠[Nd:NaY(WO4)2,Nd:NYW]晶体,测量了Nd:NYW晶体的吸收光谱.吸收光谱表明:该晶体在804,752 nm和586 nm附近的吸收峰较强、较宽,有利于用激光二极管(laser diode,LD)泵浦.分别以氙灯和LD作为泵浦源,对晶体的激光特性进行了研究.结果表明:当氙灯输入能量为11.7 J时,该激光棒获得了36.9 mJ的输出;当LD泵浦功率为1 w时,输出273 mW的1.06 μm波长激光,激光阈值为160 mW,光-光转换效率为27.3%,斜效率为34%.     

The optical spectra characterization of Cr2+:ZnSe polycrystalline synthesized by direct reaction of Zn–Cr alloy and element Se

Cr²⁺:ZnSe materials have attracted much attention as candidates for mid-infrared laser source either in the form of polycrystalline powders, or bulk ceramics, single crystals and nano-materials. In this work, a novel method for synthesizing Cr²⁺:ZnSe polycrystalline by direct reaction of Zn–Cr alloy and element Se (DRAE) was proposed. The zinc alloy containing 0.1 at% Cr was prepared by dissolving Cr in zinc liquid in a closed quartz ampoule. X-ray diffraction (XRD) results showed that the synthesized Cr²⁺:ZnSe polycrystalline was with a Zinc-blend structure. X-ray photoelectron spectroscopy (XPS) spectra showed that there was no un-reacted element of Zn, or Se. Cr²⁺ ions successfully and uniformly doped into ZnSe crystal lattice, which is confirmed by the diffuse reflectance spectrum, Raman spectrum and mid-infrared photoluminescence spectra. Furthermore, the sample showed excellent mid-infrared properties without luminescence quenching in the region 1800–3000 nm, and the decay-time was about 5 μs. The as-synthesized Cr²⁺:ZnSe polycrystalline meets the requirement for the preparation of mid-infrared ceramic or single crystals. These results indicate that the novel strategy of DRAE is valid for the synthesis of other transition metal doped ZnSe materials.     

Intense broadband 3.1 μm emission in Er3+-doped fluoroaluminate-tellurite glass for mid-infrared laser application

Er³⁺ single doped fluoroaluminate-tellurite glasses were made by employing a conventional melt-quenching technique. A strong fluorescence around 3.1 μm was achieved from Er³⁺-doped fluoride glasses, under a 980 nm laser diode pump, which was assigned to the Er³⁺: ⁴S_3/2 → ⁴F_9/2 radiation transition process. The up-conversion and mid-infrared spectra of emission for fluoroaluminate-tellurite glasses with various concentrations of Er³⁺ ions dopant was researched. In addition, the calculated fluorescence lifetime value about 3.1 μm reaches 0.48 ms. The findings indicate that fluoroaluminate-tellurite glasses doped with Er³⁺ have prospects of being developed into 3.1 μm mid-infrared fiber and laser materials.     

近化学计量比Cu:Fe:LiNbO3晶体的生长及蓝光优化光折变性能

以K2O为助溶剂在LiNbO3中掺入0.15%(质量分数,下同)CuO,0.03%和0.05%Fe～03,用顶部籽晶溶液生长法生长近化学计量比Cu:Fe:LiNbO3晶体.以Ar+激光器的488nm激光为光源测试Cu:Fe:LiNbO3晶体的光激载流子类型,采用二波耦合光路测试了晶体的光折变存储性能,并与633nm红光...     

稀土离子在LiYF4晶体中的有效分凝系数

在CF4气氛中成功地生长出高质量的掺三价稀土离子的LiYF4晶体，测试了16种稀土离子LiYF4晶体中的有效分凝系数，三价稀土离子在LiYF4晶体中的有效分凝系数随离子半径变化是有规律的，离子半径小于Y^3 的稀土离子的有效分凝系数都大于1，离子半径大于Y^3 的稀土离子的有效分凝系数小于1，并且后者随离子半径增大而单调减小，这种变化规律主要与离子进入晶体后对晶胞的畸变作用有关。     

Optical properties and laser-induced damage threshold for Pb(Mg1/3Nb2/3)O3−based ferroelectric crystals

As an excellent kind of ferroelectric crystal, Pb(Mg_1/3Nb_2/3)O₃–PbTiO₃ (PMN-PT) crystals have been proved to have excellent nonlinear optical properties. However, the laser damage threshold (LIDT) for PMN-PT crystals, another important parameter in the field of nonlinear crystals remains understudied. This study investigated the optical properties and laser-induced damage thresholds (LIDTs) for PMN-based crystals. It shows that the maximum transmission is 78% and the maximum threshold for PMN-based crystals is 6.92 J/cm², amounting to about 3.64 times the threshold for doped PMN-based crystals (1.9 J/cm²). This is probably related to the considerably decreased laser resistance of the dopants to PMN-based crystals because of the heterogeneous local polar regions and defects in the doped crystals. Conclusively, the present study has proved that pure PMN-based crystals are currently the optimal candidates for high-power laser applications and that the doped PMN-based crystals may be an ideal candidate for on-chip photonic devices.     

Zinc doping effect on the optical bands of cr3 in LiNbO3: Zn, Cr crystals

The optical absorption and luminescence of Cr³⁺ ions in ZnO doped LiNbO₃:Cr³⁺ crystals have been studied. It has been found that ZnO produces the same effect as that observed in MgO co-doped samples: A strong reduction in the Cr³⁺ concentration together with a shift in the ⁴A₂ → ⁴T₁ vibronic transition to lower energy. As in the case of MgO co-doped samples a new Cr³⁺ centre is formed in ZnO co-doped samples.     

磷酸盐激光玻璃研究进展

由于国内外大型激光贯性约束聚变装置的兴建和光通信的迅速发展,磷酸盐激光玻璃。尤其是激光钕玻璃得到了前所未有的发展。本文介绍了目前国内外磷酸盐激光玻璃,主要是掺钕、掺铒、掺镱磷酸盐激光玻璃的最新研究进展。     

Yb:YCOB黄光激光自倍频晶体

采用提拉法生长了不同掺杂浓度(5％～30％,摩尔分数,下同)的Yb:YCa4O(BO3)3(Yb:YCOB)激光自倍频晶体,研究了系列晶体的结构与掺杂浓度之间的关系,加工了最大有效非线性系数方向的自倍频晶体并实现微片结构器件设计.利用强电—声子耦合作用,在掺杂浓度为30％、晶体长度为4 mm的Yb:YCOB晶体中获得了...     

激光透明陶瓷研究的历史与最新进展

由于透明陶瓷具有许多比单晶优越的性能,因此透明多晶陶瓷激光器成为近年来二极管泵浦固态激光器领域的研究焦点.目前,在Nd:YAG陶瓷激光器中,已获得高于1 kw的高激光输出功率和高于65%的斜率效率,在Yb掺杂的倍半氧化物陶瓷激光器中,实现了二极管泵浦的超快飞秒锁模激光输出以及82.4%的所有陶瓷激光器中最高的斜率效率.报道了中国近来在Nd:YAG和Yb/Nd掺杂的氧化镧钇透明陶瓷方面的研究进展,由中国科学院上海硅酸盐研究所制备的Nd:YAG陶瓷激光器最大激光输出斜率效率为23.2%,由上海大学制备的一种新的Yb:Y1.8La0.2O3陶瓷激光器最大激光输出斜率效率达到52%.