共查询到17条相似文献,搜索用时 281 毫秒
1.
LiNbO3:Fe晶体中光写入阵列平面光波导的实验实现 总被引:6,自引:6,他引:6
采用两束相干平行光形成的干涉光场辐照LiNbO3: Fe晶体,通过光折变效应在晶体中写入了阵列平面光波导.分别采用马赫-曾德干涉仪光路和光栅衍射法测量了阵列平面光波导的横向折射率分布和周期,并对所写入的阵列平面光波导进行了初步的导光测试.实验结果表明,用这种方法写入阵列平面光波导简便可行. 相似文献
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Tb、Fe双掺LiNbO3晶体的生长及其光折变效应的研究 总被引:1,自引:0,他引:1
用提拉法从熔体中生长出Tb、Fe双掺LiNbO3晶体,用二波耦合方法测试了晶体的指数增益系数、衍射效率和响应时间。Tb:Fe:LiNbO3薄晶片中,由于光爬行作用,使得晶体的指数增益系数和衍射效率大大增强,掺入Tb后晶体的光电导值增大,响应时间缩短。 相似文献
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Mg:Fe:LiNbO3晶体的生长及光学性能研究 总被引:6,自引:6,他引:0
在Fe:LiNbO3中掺进MgO和Fe2O3以提拉技术生长Mg:Fe:LiNbO3晶体.对晶体进行极化和还原处理.测试晶体的吸收光谱,Mg:Fe:LiNbO3晶体吸收边相对Fe:LiNbO3晶体发生紫移.测试晶体的红外光谱,Mg:(5 mol%)Fe:LiNbO3晶体OH-吸收峰由Fe:LiNbO3晶体的3482 cm-1移到3534 cm-1.采用锂空位模型阐述Mg:Fe:LiNbO3晶体,吸收边和OH-吸收峰移动的机理.测试晶体的抗光致散射能力.Mg:(5 mol%)Fe:LiNbO3晶体抗光致散射能力比Fe:LiNbO3晶体提高一个数量级以上.测试晶体的衍射效率和响应时间.Mg:Fe:LiNbO3晶体响应速度比Fe:LiNbO3晶体提高四倍. 相似文献
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采用氙灯泵浦新型晶体Nd:Sr5(PO4)3F,以KTP晶体腔内倍频,实现了该晶体0.5295μm绿光激光BDN染料片调Q运转。测量了输出绿光激光的特性及不同腔长和染料片小信号透过率情况下的输出能量及脉冲宽度,给出了染料片调Q腔内倍频的耦合波方程组,数值求解该方程组,所得的理论数据与实验结果较好地相符。 相似文献
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两参数变形量子代数SU(1,1)q,s的相干态及其性质 总被引:1,自引:1,他引:0
利用SU(1,1)q,s量子代数的两参数变形振子构造出归一化的SU(1,1)q,s相干态,证明了SU(1,1)q,s量子代数的表示基是正交的,并讨论了它的相干态的归一性和完备性。指出(SU(1,1)q,s相干态的相干性受参数q、s的影响。 相似文献
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Mg2+对Fe:LiNbO3晶体光折变响应时间的影响 总被引:3,自引:3,他引:0
在Fe:LiNbO3中掺进3mol%和6mol%MgO,生长了Mg:Fe:LiNbO3晶体.测试了Mg:Fe:LiNbO3晶体抗光致散射能力、衍射效率、响应时间和光电导.推导响应时间与光电导之间的关系.在Fe:LiNbO3晶体中掺进6mol%的Mg2+,它的抗光致散射能力比Fe:LiNbO3晶体提高一个数量级,响应速度比Fe:LiNbO3晶体提高四倍. 相似文献
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本文利用X射线粉末衍射和位敏探测技术,研究了R2Fe4/3W2/3O7(R=Er、Yb、Dy)化合物经高温高压处理后的变化情况。在3.7 GPa,1 200 ℃条件下,六方相R2Fe4/3W2/3O7化合物按两种方式分解,而直接由R2O3,Fe2O3和WO3原料出发,经上述同样的高温高压条件合成所得的产物与六方相高温高压分解产物相同,均为R2WO6、RFeO3、WO3和Fe2O3的多相聚合物。同时给出了R2Fe4/3W2/3O7六方相高温高压下的稳定区范围。 相似文献
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Zuo Xiaoxi 《Optik》2005,116(7):361-364
Fe:LiNbO3 and In:Fe:LiNbO3 crystals were grown by Czochralski method. The absorption spectra were measured to investigate their defect structure. The photo damage resistance and photorefractive properties were measured. The photo damage resistance of the In:Fe:LiNbO3 crystal in which the In concentration is above the threshold value is one order of magnitude higher than that of the Fe:LiNbO3 crystal. The mechanisms of the violet shift of the absorption edge and the enhancement of the photorefractive effect of In:Fe:LiNbO3 crystals were investigated. 相似文献
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The new non-volatile holographic storage materials, Zn:Mn:Fe:LiNbO3 crystals, were prepared by Czochralski technique. Their microstructure was measured and analyzed by infrared (IR) transmission spectra. The optical damage resistance of Zn:Mn:Fe:LiNbO3 crystals was characterized by the transmitted beam pattern distortion method. It increases remarkably when the concentration of ZnO is over a threshold concentration. Its value in Zn(7.0 mol%):Mn:Fe:LiNbO3 crystal is about three orders of magnitude higher that in Mn:Fe:LiNbO3 crystal. The photoinduced birefringence change was measured by the Sénarmont's method. It decreased with ZnO concentration increasing. The dependence of the defects on the optical damage resistance was discussed. 相似文献
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Hongxin Shi Xiudong Sun Suhua Luo Yongyuan Jiang Qingxin Meng 《Optics & Laser Technology》2010,42(7):1118-1121
A series of Hf:Fe:LiNbO3 crystals were grown by the Czochralski technique with various doping concentrations of HfO2. Their defect structures were analyzed by the UV-visible absorption spectra and infrared absorption spectra. The optical damage resistance of Hf:Fe:LiNbO3 crystals was measured by the photo-induced birefringence change and the transmitted light spot distortion method. The results show that the optical damage resistance ability of Hf:Fe:LiNbO3 crystals enhances remarkably with the HfO2 concentration increasing when the HfO2 concentration is lower than its threshold concentration (4 mol%). However, when the HfO2 concentration exceeds its threshold concentration, the optical damage resistance ability of the crystals returns to decrease. This unusual behavior is explained by using the photovoltaic field produced in the crystals. 相似文献
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Fe:LiNbO3全息图热定影及H+浓度的影响 总被引:4,自引:4,他引:0
应用光折变效应动力学方程,导出了在Fe:LiNbO3中对光折变全息图热定影所需的最小H+浓度,以及H+浓度与光栅空间频率的关系.应用光谱比较法测量了不同样品的H+浓度值.得出了进行有效热定影的H+浓度范围.完成了Fe:LiNbO3全息存储和热定影实验.获得了100h连续无损读出的良好热定影实验结果. 相似文献
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Ce:Fe:LiNbO3 crystals were grown by the Czochralski technique with various ratios of Li/Nb = 0.94, 1.05, 1.20 and 1.38 in the melt. Their UV–Vis absorption spectra were measured in order to investigate their defect structures and their optical damage resistance was characterized by the photoinduced birefringence change and transmission facual distortion method. The optical damage resistance of Ce:Fe:LiNbO3 crystals improves with the Li/Nb ratio increases. The dependence of the optical damage resistance on the defect structure of Ce:Fe:LiNbO3 crystals is discussed in detail. 相似文献
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A series of Zn:Fe:LiNbO3 crystals were prepared by the Czochralski technique with 0.015 wt. % Fe2O3 content and various concentrations of ZnO. The ultraviolet-visible absorption spectra and the infrared absorption spectra
of the Zn:Fe:LiNbO3 crystals were detected in order to investigate their defect structure. Their optical damage resistance was characterized
by the photoinduced birefringence change and transmission facula distortion method. The optical damage resistance of the Zn:Fe:LiNbO3 crystals increases remarkably when the concentration of ZnO is over its threshold concentration (more than 6.0 mol. %). The
effects of defects on the optical damage resistance of the Zn:Fe:LiNbO3 crystals are discussed in detail.
Received: 25 October 2002 / Revised version: 6 January 2003 / Published online: 22 May 2003
RID="*"
ID="*"Corresponding author. Fax: +86-451/2300-926, E-mail: zzxxhhdoctor@sina.com 相似文献
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Doping MgO, MnO and Fe2O3 in LiNbO3 crystals, tri-doped Mg:Mn:Fe:LiNbO3 single crystals were prepared by the conventional Czochralski method. The UV-vis absorption spectra were measured and the shift mechanism of absorption edge was also investigated in this paper. In Mg:Mn:Fe:LiNbO3 crystal, Mn and Fe locate at the deep level and the shallow level, respectively. The two-photon holographic storage is realized in Mg:Mn:Fe:LiNbO3 crystals by using He-Ne laser as the light source and ultraviolet as the gating light. The results indicated that the recording time can be significantly reduced for introducing Mg2+ in the Mg:Mn:Fe:LiNbO3 crystal. 相似文献