Tm3+-doped Bismuth Tellurite Glasses for S- and U-band Optical Amplifiers
Effective ~1.47mm and powerful ~1.8mm infrared emissions have been observed in Tm3+-doped bismuth tellurite glasses with low phonon energy under the excitation of 793nm diode laser. Judd-Ofelt parameters W2 (4.65´10-20cm2), W4 (1.15´10-20cm2), and W6 (1.16´10-20cm2) indicate a higher asymmetric and stronger covalent environment in the optical glasses. In 0.5wt% Tm3+-doped sample, the peak emission cross-sections of 3H4®3F4 and 3F4®3H6 transitions are derived to be 2.83´10-21 and 6.13´10-21cm2, respectively, and the maximum gain coefficients of 0.38 and 2.21dB/cm at 1.675 (U-band edge) and 1.856mm wavelengths were anticipated in an ideal status. These results indicate the Tm3+-doped bismuth tellurite glasses are a promising candidate in developing S- and U-band amplifiers.
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
Q. Shen et al., "Tm3+-doped Bismuth Tellurite Glasses for S- and U-band Optical Amplifiers", Advanced Materials Research, Vols. 239-242, pp. 3078-3081, 2011