荧光俘获效应对掺铒氧化物玻璃光谱性质的影响

测试了不同掺杂浓度和样品厚度下掺铒磷酸盐和碲酸盐玻璃的吸收光谱、荧光光谱和荧光寿命，计算了Er^3＋离子在1．53μm处的吸收截面（σa）、发射截面（σe）、自发辐射跃迁概率（Arad）、辐射跃迁寿命（τrad）、以及辐射跃迁量子效率（η）等光谱参数．讨论了荧光俘获效应对掺铒磷酸盐和碲酸盐玻璃光谱性质及光谱参数的影响．结果表明即使在铒离子低掺杂浓度（0．1mol％Er2O3）下，荧光俘获效应也普遍存在于掺铒玻璃材料中，使得荧光寿命（τt）和荧光半高宽（FWHM）随样品的厚度和铒离子掺杂浓度增加而增大，导致

The absorption spectra, fluorescence spectra and the lifetimes of I-4(13/2) level of Er3+ -doped phosphate and tellurite glasses have been measured for sample with different concentrations and thickness. The absorption cross-section (sigma(a)) emission crosssection (sigma(e)), spontaneous emission probability (A(rad)), radiative lifetime (tau(rad)) and quantum efficiency (eta) of fluorescence around 1.53 mu m of Er3+ -doped phosphate and tellurite glasses were determined. The effect of radiation trapping on the spectral properties and parameters of Er3+ -doped tellurite and phosphate glasses has been investigated. It was found that radiation trapping exists generally in erbium-doped glass hosts, even at low Er3+ -doping concentration (0.1 mol% Er2O3). Due to radiation trapping, the values of the tau(rad) of the Er3+ :I-4(13/2) level in tellurite glasses increased about 11 % -37 % with the sample thickness and erbium doping concentration, while in phosphate glasses (tau)rad increased by 6%-17%. The full-width at half maximum (FWHM)of fluorescence in tellurite glasses increased about 15%-64%, with 11%-55% for phosphate glasses. It caused a high overestimation on the figure of merits (FOM) for amplifier bandwidth (sigma(e) x FWHM). The spectral overlap between the emission and absorption spectra in 1.53 mu m band is relatively larger in tellurite than in phosphate glasses, and values of the emission crcss-section in tellurite glasses are larger than that in phosphate glasses. Consequently, the radiation trapping in tellurite glasses is more severel than that in phosphate glasses.