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在Pr3+∶ZBLAN光纤中,运用粒子数速率方程理论,研究用586 nm和335 nm连续激光双光子激发4f组态最高能级1S0,以1S0和3F4为激光上下能级实现250 nm上转换紫外激光的动力学行为,得到阈值抽运功率、激光输出功率、斜率效率和最佳光纤长度等激光参数。结果表明,阈值抽运功率随光纤长度增加而增大,斜率效率随光纤长度增加而减小,光纤较短时,无法获得较高输出功率。掺杂浓度越大则阈值抽运功率越小,斜率效率越大。在选取的特定条件下,斜率效率最高可达16.7%。
In the Pr3 +: ZBLAN fiber, using the theory of particle number rate equations, the maximum energy level 1S0 of 4f is excited by 586 nm and 335 nm continuous-wave two-photon excitation, and the 250 nm up-conversion UV laser is realized by 1S0 and 3F4 The laser parameters such as threshold pumping power, laser output power, slope efficiency and optimal fiber length are obtained. The results show that the threshold pumping power increases with the increase of the fiber length, and the slope efficiency decreases with the increase of the fiber length. When the fiber length is short, the higher output power can not be obtained. The greater the doping concentration is, the smaller the threshold pumping power is and the greater the slope efficiency is. Under selected conditions, the slope efficiency can reach as high as 16.7%.