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首页> 外文期刊>Optical Materials >Laser stimulated third harmonic generation studies in ZnO-Ta_2O_5-B_2O_3 glass ceramics entrenched with Zn_3Ta_2O_8 crystal phases
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Laser stimulated third harmonic generation studies in ZnO-Ta_2O_5-B_2O_3 glass ceramics entrenched with Zn_3Ta_2O_8 crystal phases

机译：ZnO-Ta_2O_5-B_2O_3晶体相为Zn_3Ta_2O_8的玻璃陶瓷中激光激发三次谐波的研究

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In this study zinc borate glasses doped with different concentrations Ta2O5 were synthesized and were crystallized by heat treatment for prolonged times. The samples were characterized by XRD, SEM, IR and Raman spectroscopy techniques. The SEM images of the crystallized samples have indicated that the samples contain randomly distributed crystal grains with size similar to 1 mu m entrenched in the residual amorphous phase. XRD studies have exhibited diffraction peaks identified as being due to the reflections from (1 1 1) planes of monoclinic Zn3Ta2O8 crystal phase that contains intertwined tetrahedral zinc and octahedral tantalate structural units. The concentration of such crystal phases in the bulk samples is observed to increase with increase of Ta2O5 up to 3.0 mol%. The IR and Raman spectroscopy studies have confirmed the presence of ZnO4 and TaO6 structural units in the glass network in addition to the conventional borate structural units. For measuring third harmonic generation (THG) in the samples, the samples were irradiated with 532 nm laser beam and the intensity of THG of probing beam (Nd:YAG) lambda = 1064 nm 20 ns pulsed laser (omega)) is measured as a function of fundamental beam power varying up to 200 J/m(2). The intensity of THG is found to be increasing with increase of fundamental beam power and found to be the maximal for the glass crystallized with 3.0 mol% of Ta2O5. The intensity of THG of the ceramicized samples is found to be nearly 5 times higher with respect to that of pre-crystallized samples. The generation of 3 omega is attributed to the perturbation/interaction between Zn3Ta2O8 anisotropic crystal grains and the incident probing beam. (C) 2017 Elsevier B.V. All rights reserved.
机译：在这项研究中，合成了掺有不同浓度Ta2O5的硼酸锌玻璃，并通过长时间的热处理使其结晶。通过XRD，SEM，IR和拉曼光谱技术对样品进行表征。结晶样品的SEM图像表明，样品中含有随机分布的晶粒，其尺寸类似于残留在残余非晶相中的1微米。 XRD研究显示衍射峰被鉴定为归因于单斜Zn3Ta2O8晶相的（1 1 1）平面反射，该晶相包含交织的四面体锌和八面体钽酸结构单元。观察到大块样品中此类晶相的浓度随Ta2O5的增加而增加，最高可达3.0 mol％。红外和拉曼光谱研究证实，除了传统的硼酸盐结构单元外，玻璃网络中还存在ZnO4和TaO6结构单元。为了测量样品中的三次谐波产生（THG），用532 nm激光束照射样品，并测量探测束（Nd：YAG）λTHG的强度= 1064 nm 20 ns脉冲激光（Ω）作为基本光束功率的最大变化范围高达200 J / m（2）。发现THG的强度随基本光束功率的增加而增加，并且对于以3.0 mol％的Ta2O5结晶的玻璃来说，THG的强度最大。发现陶瓷化样品的THG强度是预结晶样品的THG强度的近5倍。 3Ω的产生归因于Zn3Ta2O8各向异性晶粒与入射探测光束之间的摄动/相互作用。 （C）2017 Elsevier B.V.保留所有权利。

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