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采用改进的化学气相沉积法和溶液掺杂法制备出掺镱石英光纤预制棒,以该预制棒为有源纤芯制备芯区直径约为30μm的双包层保偏掺镱光子晶体光纤.模拟计算得到该保偏光纤的模场面积约232μm2,双折射系数B为5×10-5.利用该光纤分别进行了脉冲激光和连续激光的放大测试实验,在国内首次实现了高效率的飞秒激光放大,2 m长的光子晶体光纤可得到1.64 W的激光输出,激光放大斜率效率为49.8%.同时5 m长的光纤还能够实现8.12 W的连续激光放大输出,斜率效率达到55.9%,具有较高的斜率效率.此外,该光纤消光比约10 dB,具有良好的保偏特性.
An improved yttrium-doped silica optical fiber preform was prepared by modified chemical vapor deposition method and solution doping method, and the double-cladding polarization-maintaining ytterbium photonic crystal fiber with a core diameter of about 30 μm was prepared by using the preform as an active core. The calculated PMF field area is about 232μm2 and the birefringence coefficient B is 5 × 10-5.Experimental experiments of pulsed laser and continuous laser with this fiber are carried out respectively, The laser-amplified, 2 m-long photonic crystal fiber delivers a laser output of 1.64 W with a 49.8% laser slope slope while a 5-m long fiber can deliver a continuous laser output of 8.12 W with a slope efficiency of 55.9% High slope efficiency.In addition, the fiber extinction ratio of about 10 dB, with good polarization characteristics.