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研究了长脉冲抽运光子晶体光纤(PCF)正常色散区超连续谱的产生。依据透镜耦合的基本条件设计了激光器与入射光纤之间的耦合系统,该系统的耦合效率可以达到60%;实现了模场不匹配的普通光纤与光子晶体光纤的低损耗熔接,实验测得的熔接损耗为3.8 dB,低于理论计算的熔接损耗5 dB。随着抽运功率的增加,产生了平均功率为1.2 W,10 dB的带宽为710～1700 nm的超连续谱。实验结果表明,长脉冲抽运光子晶体光纤的正常色散区,受激拉曼散射在光谱加宽的最初阶段发挥了重要作用,而高阶孤子分解和交叉相位调制促使超连续谱趋于更宽、更平坦。
The generation of supercontinuum in the normal dispersion region of long pulse pumping photonic crystal fiber (PCF) was studied. According to the basic conditions of lens coupling, the coupling system between laser and incident optical fiber is designed and the coupling efficiency of the system can reach 60%. The mode-field mismatch between ordinary optical fiber and photonic crystal fiber is achieved. The splice loss is 3.8 dB, which is 5 dB below the theoretical splice loss. With the increase of pumping power, a supercontinuum with a bandwidth of 710 ~ 1700 nm with average power of 1.2 W and 10 dB was generated. Experimental results show that stimulated Raman scattering plays an important role in the initial dispersion of SPF photonic crystal fibers, while higher-order soliton decomposition and cross-phase modulation tend to make supercontinuum wider , More flat.