掺铒铋酸盐玻璃的光谱性质研究

研究了掺铒铋酸盐玻璃的吸收和荧光光谱性质,应用Judd-Ofelt理论计算了玻璃的三个强度参量Ω_t=(t=2,4,6),分别为Ω₂=3.71×10^-20cm²,Ω₄=1.86×10^-20cm²,Ω₆=1.28×10^-20cm²,计算了Er³⁺离子的自发跃迁几率、荧光分支比等光谱参量.经荧光谱测试发现掺Er³⁺铋酸盐玻璃的荧光半高宽可达70nm.应用McCumber理论计算1.53μm处的受激发射截面可达9×10^-21cm².对Er³⁺离子在不同基质玻璃中光谱特性的比较发现,Er³⁺在铋酸盐玻璃中具有相对较高的受激发射截面和宽的荧光半高宽.

SPECTROSCOPIC PROPERTIES OF ERBIUM-DOPED BISMUTH-BASED GLASS

Absorption spectra,emission spectra of Er³⁺-doped bismuth-based glasses were studied.The ultraviolet cut-off wavelength of bisumth-based glass is larger than that of lther glasses,such as silicate glass,phosphate glass,and tellurite glass.The relatively higher refractive index of bismuth-based galss made it has larger stimulated emission cross section((σ_e=9.0×10^-21cm²) and broader FWHM(～70nm),which are two very important parametrs for optical fiber amplifier.Judd-Ofelt strength parameters Ω_t(t=2,4,6),are 3.71×10^-20cm²,1.86×10^-20cm²,1.28×10^-20cm²,respectively.The Ω₆ is much larger in bismuth-based glass than that in other glasses,so Er-O hamuch less covalency in this glass.Spontaneous radiative rate and branch ratios of each energy level of Er³⁺ ions were also given.The ratios of line strengths of eectric dipole transition to manetic dipole transition are much bigger in bismuth-based glass,which contribute to broad and flat emission.Stimulated emission cros section was also calculated by McCumber theory.The optical properties of Er³⁺ in bismuth-based glass are discussed by comparing with other host glasses.