摘要
The modeling of rare-earth-doped fiber amplifier is accomplished by utilizing the rate and propagation equations of distinct levels for a laser medium. A complex theoretical model for neodymium （Nd3＋）, erbium （Er3＋）, thulium （Tm3＋） and ytterbium （Yb3＋） codoped telluride glass fiber covering 0.4--2.0 μm emission spectra is presented. The emission spectra of Nd3＋-Er3＋-Tm3＋-yb3＋ codoped telluride fiber are realized with the excitation of both 808 and 980 nm lasers pumped at 500 mW. Numerical methods are used to calculate the emission spectra covering 0.4--2.0 μm. With the Nd3＋, Tm3＋ and Yb3＋ ion concentrations fixed at 2 x 1020 ion/m3, the Er3＋ ion concentration optimized to 8 x 10^20 ion/m3 and the fiber length spanning from 0.5 to 2 m, a peak amplified spontaneous emission （ASE） power of 19.8 mW is attainable, and a minimum ASE power of 7.96 mW can also be achieved. The analytical techniques and results indicate that when a telluride codoped fiber with suitable ion concentrations of Nd3＋, Er3＋, Tm3＋ and Yb3＋ is excited by both 980 and 808 nm pump lasers, 0.4-2.0 μm emission spectra are attainable for vast optical applications.
The modeling of rare-earth-doped fiber amplifier is accomplished by utilizing the rate and propagation equations of distinct levels for a laser medium. A complex theoretical model for neodymium(Nd^(3+)), erbium(Er^(3+)),thulium(Tm^(3+)) and ytterbium(Yb^(3+)) codoped telluride glass fiber covering 0.4—2.0 μm emission spectra is presented. The emission spectra of Nd^(3+)-Er^(3+)-Tm^(3+)-Yb^(3+)codoped telluride fiber are realized with the excitation of both 808 and 980 nm lasers pumped at 500 mW. Numerical methods are used to calculate the emission spectra covering 0.4—2.0 μm. With the Nd^(3+), Tm^(3+)and Yb^(3+)ion concentrations fixed at 2 × 1020 ion/m^3, the Er^(3+)ion concentration optimized to 8 × 10^(20) ion/m^3 and the fiber length spanning from 0.5 to 2 m, a peak amplified spontaneous emission(ASE) power of 19.8 mW is attainable, and a minimum ASE power of 7.96 mW can also be achieved. The analytical techniques and results indicate that when a telluride codoped fiber with suitable ion concentrations of Nd^(3+), Er^(3+), Tm^(3+)and Yb^(3+)is excited by both 980 and 808 nm pump lasers, 0.4—2.0 μm emission spectra are attainable for vast optical applications.
作者
NKONDE Sampa
JIANG Chun
NKONDE Sampa;姜淳(State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering,Shanghai Jiao Tong University)
基金
the National Natural Science Foundation of China(Nos.60377023 and 60672017)
the Program for New Century Excellent Talents in Universities(NCET)
Shanghai Optical Science and Technology Project(No.05DZ22009)
