摘要
用高温熔融法制备了不同Ho3+浓度掺杂的65GeO2-12Ga2O3-8Li2O-10BaO-5La2O3-χHo2O3锗酸盐玻璃.从吸收光谱出发,应用Judd-Ofelt理论,获得了Ho3+离子的跃迁强度参量(Ω2,Ω4,Ω6),并由此计算了Ho3+离子的自发辐射跃迁几率A,荧光分支比β,辐射能级寿命τ等光谱参量.根据McCumber理论,计算了Ho3+离子能级5I8→5I7(2.0μm)跃迁的吸收截面和受激发射截面,同时也获得了相应的反映粒子数反转的增益截面光谱.钬掺杂的锗酸盐玻璃,其增益截面的最大值比所报道的氟锆铝酸盐玻璃大.结果表明,Ho3+掺杂的锗酸盐玻璃在2.0μm附近波段的中红外激光器中将有一定的应用前景.
Glasses with the compositions of 65GeO2-12Ga2O3-8Li2O-10BaO-5La2O3 doped with different Ho^3＋ concentration were fabricated by conventional melting method. According to the absorption spectra and the Judd-Ofelt theory,the J-O strength parameters （Ω2,Ω4,Ω6） of Ho^3＋ were calculated,by which the radiative transition probabilities, fluorescence branching ratios and radiative lifetimes were obtained. According to McCumber theory, the absorption and emission cross-sections corresponding to the 5Ⅰ8→5Ⅰ7 transitions of Ho^3＋ （at （2.0μm） were obtained,and respective gain cross section spectra were also computed as a function of population inversion. For Ho^3＋-doped germanate glasses, the maximum gain cross-section reached a value higher than that reported for fluorozircoaluminate glasses. Hence, these Ho^3＋-doped germanate glasses have an advantage for application in lasers at about 2.0μm mid-infrared wavelength.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2008年第11期2269-2273,共5页
Acta Photonica Sinica
基金
浙江省自然科学基金(Y406220)
重点实验室开放(2007A22010)资助
关键词
光学材料
掺钬锗酸盐玻璃
吸收光谱
增益截面
Optical materials
Ho^3＋ -doped germanate glasses Absorption spectra
Gain cross-section
