掺铒铋酸盐玻璃的光谱性质研究

SPECTROSCOPIC PROPERTIES OF ERBIUM-DOPED BISMUTH-BASED GLASS

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Ωt=(t=2 ,4,6 ) ,分别为Ω2 =3 .71× 1 0 - 2 0 cm2 ,Ω4=1 .86× 1 0 - 2 0 cm2 ,Ω6=1 .2 8× 1 0 - 2 0 cm2 ,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 .5 3 μm处的受激发射截面可达 9× 1 0 - 2 1 cm2 .对Er3+离子在不同基质玻璃中光谱特性的比较发现 。

Absorption spectra,emission spectra of Er 3+-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 -21cm 2) 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 -20cm 2,1.86×10 -20cm 2,1.28×10 -20cm 2,respectively.The Ω 6 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 Er 3+ 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 Er 3+ in bismuth-based glass are discussed by comparing with other host glasses.