掺钐聚合物光纤的光辐射跃迁特性  

Optical radiative transition characteristics of Sm^(3+)-doped polymer optical fiber

作　　者：刘志高[1] 彭东青[1] 

机构地区：[1]集美大学理学院,福建厦门361021

出　　处：《光电工程》2007年第2期115-119,共5页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(90201013);福建省自然科学基金资助项目(A0510014)

摘　　要：制备了掺钐螯合物的阶跃型聚合物光纤,研究了螯合物Sm(DBM)3(TOPO)2掺杂的聚甲基丙烯酸甲酯(PMMA)的吸收光谱、激励光谱和发射光谱。根据Judd-Ofelt(J-O)理论,从吸收光谱获得了光学跃迁的强度参数Ω2、Ω4、Ω6分别为18.53×10-20cm2、2.87×10-20cm2、3.71×10-20cm2。用光学强度参数计算了激发态4G5/2的辐射跃迁几率(536.19s-1)和辐射寿命(1865μs);同时,计算了4G5/2→6HJ'跃迁的受激发射截面和4G5/2→6FJ'、6HJ'的荧光分支比。分析表明,Sm(DBM)3(TOPO)2掺杂的PMMA可望用于聚合物光纤激光器和放大器。A Sin-chelate-doped step-index polymer optical fiber was fabricated. Optical absorption, excitation and emission spectra of Sm^3＋ ions in Sm（DBM）3（TOPO）2-doped Polymethyl Methacrylate （PMMA） were studied. Based on Judd-Ofelt （J-O） theory, the optical intensity parameters Q2, Q4 and Q6 calculated were 18.53×10^-20cm^2, 2.87×10^-20cm^2, and 3.71 ×10^-20cm^2, respectively from the absorption spectrum. The optical intensity parameters were used to calculate the total radiative transition rate （536.19s^-1） and radiative lifetime （1865μs） of the ^4G5/2 exciting state. The stimulated emission cross-sections for the ^4G→^6Hr, and the fluorescence branch ratios for the ^4G→^6Hr,^6Hr, transitions were also calculated. Analysis result reveals that Sm（DBM）3（TOPO）2-doped PMMA is promising for application in polymer optical fiber laser and amplifier.

关 键 词：掺钐螯合物 聚甲基丙烯酸甲酯 J-O参数 辐射跃迁几率 受激发射截面 

分 类 号：O433[机械工程—光学工程]