铒镱共掺光波导激光器的稳态特性

Steady characteristics of Er^(3+)/Yb^(3+) co-doped phosphate optical waveguide laser

从光波导激光器的工作理论出发,研究了铒镱共掺磷酸盐波导激光器的稳态特性。利用重叠因子简化了980nm光抽运的铒镱共掺波导激光器四能级模型的速率-传输方程;在忽略自发辐射的情况下,利用数值模拟的方法,得到了铒镱共掺波导激光器的输出与Er3+/Yb3+离子浓度、泵浦功率、波导长度等参量之间的关系曲线。理论分析结果表明,选择合适的铒镱离子浓度是制作铒镱共掺波导激光器的关键。采用980nm波长的泵浦光,泵浦功率为80mW,Er3+浓度取2.0×1026/m3左右,Yb3+/Er3+浓度比为7～10,波导长度为2.0cm左右时,可以得到最大输出光功率。

The characteristics of an Er^3＋/Yb^3＋ co-doped phosphate glass waveguide laser are investigated on the basis of the working theory of a waveguide laser. Using the overlapping factor, the rate-propagation equations of the four-level system of the phosphate glass waveguide laser are simplified. Without considering amplified spontaneous emission, the relations between the laser outputs and the laser parameters are researched by numerical simulations and the relation curves of Er^3＋/Yb^3＋ ion concentration, pump powers and waveguide lengths with the laser powers are obtained. The result shows that selecting right Er^3＋/Yb^3 ＋ ion concentration is the key for the optical waveguide laser. The best fit results can be obtained from the following parameters in Er^3＋ ion concentration of 2. 0 × 10^26/m^3, Yb^3＋/Er^3＋ concentration ratio of 7 N 10, and a waveguide length about 2. 0 cm, when the pumping power is 80 mW at a wavelength of 980 nm.