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A NEW-TYPE ULTRAVIOLET SHG CRYSTAL——β-BaB_2O_4 总被引:3,自引:0,他引:3
On the basis of our work "An anionic group theory of electro-optical and nonlinear optical effects of the crystals", we first proposed the possibility of searching for new-type SHG crystals among the inorganic materials possessing planar ring groups. Since then, a new-type ultraviolet StIG crystal—β-BaB_2O_4 has been developed, a crystal with excellent optical homogeneity, anti-deliquescence and easy-working mechanical properties. Various measurements have been made thereupon of its powder sample tests, phase diagram, structural determination and other performance tests. The following parameters of β-B_aB_2O_4 have thus been determined: space group at room temperature R3, melting point 1095℃, phase transition temperature 925±5℃, transparent band range 190—2500mμ, phase matching angle at 539—270mμ 47°, and radiation damage threshold 2GW/em~2. Its effective SHG coefficient is 3—6 times larger than that of ADP (at different wavelengths). It is expected that this new crystal will find wide and e 相似文献
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Nd^3 :GdAl3(BO3)4(NGAB) crystal with the size of 30 mm was grown from the solvent system of K2O-Gd2O3-MoO3-B2O3 by combining accelerated seed rotation technology with medium seeded solution growth (MSSG) method,and its crystal structure has been determined by X-ray powder diffraction.It crystallizes in the trigonal system,space group R32 with a=9.2743(2),c=7.2438(1)A,V=538A^3,Z=3and Dc=4.379g/cm^3,The absorption and emission spectra of NGAB in the function of σ and π polarizations at room temperature have been measured.UV generation tuneable in 378-382nm,green(531nm) generation and blue generation tuneable in 436-443 nm as well as red(669)nm generation by self-frequency changing were obtained with the oupput of 105, 119.5,445and 19μJ/pulse,respectively,when the crystal was pumped by a dye laser. 相似文献
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稀土掺杂钨酸镧钠激光晶体的生长及其性能研究 总被引:1,自引:0,他引:1
采用提拉法生长出了纯的和Nd3 、Tm3 、Dy3 、Ho3 、Pr3 离子掺杂的大尺寸优质的NaLa(WO4)2晶体.TG/DTA实验表明NaLa(WO4)2晶体在1251℃同成分熔化,热膨胀实验结果显示该晶体沿(100)和(001)方向的热膨胀系数分别为1.23×10-5K-1和2.49×10-5K-1.在室温下测量了该晶体的红外和拉曼光谱,对晶体的振动性质进行了研究.对稀土离子掺杂的NaLa(WO4)2晶体进行了光谱性质的研究.N3 :NaLa(WO4)2和Tm3 :NaLa(WO4)2晶体800 nm附近的吸收峰半高宽和吸收截面较大,有利于用LD泵浦.采用小型的氙灯泵浦,研究了Nd3 :NaLa(WO4)2晶体的激光特性.当氙灯输入能量为1.28 J时,获得14.77mJ的激光输出能量,光光转换效率为1.15%. 相似文献
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Tm掺杂的激光晶体生长、结构和光谱性能研究 总被引:3,自引:0,他引:3
采用顶部籽晶生长法从K2Mo3O10-B2O3助熔剂中生长出15 mm×15 mm×25 mm优质TmxGd1-x Al3(BO3)4(x=1,0.06)晶体.利用X射线单晶衍射仪测定了TmAl3(BO3)4晶体的结构.对Tm3+GAB晶体进行定向切割,测量得到了σ和π方向的偏振的吸收和发射光谱,并根据Judd-Ofelt理论计算了Tm3+在GdAl3(BO3)4中的J-O参数、各个能级的振子强度、自发辐射几率、荧光分支比等参数. 相似文献
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