光学学报, 2012, 32 (8): 0814002, 网络出版: 2012-06-07
高重复频率飞秒脉冲激光诱导钼酸镝玻璃表面析出β′-Dy2(MoO4)3和α-MoO3晶体
β′-Dy2(MoO4)3 and α-MoO3 Crystallization Induced by High Repetition Rate Femtosecond Laser Irradiation on the Surface of Dysprosium Molybdate Glass
激光技术 飞秒激光 析晶 钼酸镝玻璃 显微拉曼光谱 电子能谱 laser technique femtosecond laser crystallization molybdate glass micro-Raman spectra energy dispersive spectra (EDS)
摘要
高重复频率飞秒脉冲激光辐照钼酸镝玻璃表面后,通过显微拉曼测试,发现在辐照区域内形成了含有MoO4四面体结构的β′-Dy2(MoO4)3晶体和含有MoO6八面体结构的α-MoO3晶体。通过电子能谱(EDS)测量辐照前后样品中钼(Mo)元素的含量,发现在辐照中心位置形成α-MoO3晶体相的区域内出现了明显的Mo元素缺失现象,表明了在高温场作用下,微爆现象引起了材料中心密度的降低。此外,随着辐照时间的增加辐照中心位置还出现了由Dy2(MoO4)3相向MoO3晶体α相的相变。这说明随着激光作用程度的加剧,中心区域Mo元素浓度降低,使得钼氧结构由MoO4四面体向MoO6八面体转变,导致在Mo元素浓度较低的区域更容易形成八面体结构的α-MoO3。
Abstract
A high repetition rate femtosecond laser is used to irradiate the surface of dysprosium molybdate glass, and then two kinds of crystals, the β′-Dy2(MoO4)3 crystal with MoO4 structure cell and the α-MoO3 crystal with MoO6 structure cell, could be identified in the modified regions through micro-Raman spectra analysis. Energy dispersive spectra (EDS) further show that concentration of Mo element would be reduced in the center of the irradiated region as well as the α-MoO3 crystallization region, which indicates that laser induced microexplosion causes a rarefaction center under high temperature and pressure shockwave. With the irradiation time increasing, a phase transformation from β′-Dy2(MoO4)3 to α-MoO3 occurs. It implies that the concentraion reducing of Mo element due to femtosecond laser continuously irradiating could effectively promote the transformation of Mo-O structure from MoO4 to MoO6, and further for the α-MoO3 crystallization in lower Mo elements region.
杜莺莺, 马洪良, 戴晔, 韩咏梅, 钟敏建. 高重复频率飞秒脉冲激光诱导钼酸镝玻璃表面析出β′-Dy2(MoO4)3和α-MoO3晶体[J]. 光学学报, 2012, 32(8): 0814002. Du Yingying, Ma Hongliang, Dai Ye, Han Yongmei, Zhong Minjian. β′-Dy2(MoO4)3 and α-MoO3 Crystallization Induced by High Repetition Rate Femtosecond Laser Irradiation on the Surface of Dysprosium Molybdate Glass[J]. Acta Optica Sinica, 2012, 32(8): 0814002.