Author Affiliations
Abstract
1 Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China
2 Laboratory for Microstructures, Shanghai University, Shanghai 200444, China
Two kinds of Nb-doped silica fibers, an NbCl5-doped fiber and an Nb2O5-doped fiber, are fabricated and characterized in this Letter. First, the refractive index profiles of both fibers are obtained, and then their Raman spectra are measured with 785 nm exciting light. The Nb-doped fibers’ Raman spectra are compared with a conventional GeO2-doped single-mode silica fiber that is prepared with the same method and under the same conditions. As a result, the Raman gain coefficients of the Nb-doped silica fiber core are obtained. The experimental results show that Nb2O5 doping can enhance the Raman scattering intensity of the optical fibers.
060.2270 Fiber characterization 290.5860 Scattering, Raman 060.2400 Fiber properties 060.2290 Fiber materials Chinese Optics Letters
2016, 14(10): 100602
1 上海大学理学院物理系, 上海 200444
2 上海大学分析测试中心, 上海 200444
利用显微拉曼光谱仪研究了近红外飞秒激光脉冲诱导二氧化钛金红石单晶所引起的相变。实验发现当激光的平均功率为300 mW时,随着辐照时间的增加,金红石相的Eg模式强度增强,而A1g模式强度减弱,由此得出激光诱导晶体产生了色心;辐照时间为10 s时,锐钛矿相出现;并且随着辐照时间的增加,锐钛矿相的拉曼振动模式强度增强,金红石相的减弱。然而当辐照时间确定为1/63 s时,随着激光功率的增加,金红石Eg模式强度与A1g模式强度的比值增加,而没有锐钛矿相出现。
超快光学 相变 锐钛矿 飞秒激光 显微拉曼光谱术
