Opt Lett. 2018 Jun 15;43(12):2791-2794. doi: 10.1364/OL.43.002791.
Observation of the efficient second-harmonic generation (SHG) in silica fibers drew a lot of interest, as second-order processes in centrosymmetric materials should not occur. In this Letter, we extended a theoretical model of self-organized SHG to include an attenuation and investigated the influence of fiber loss on the self-organized SHG process. We performed calculations of energy conversion efficiency for SHG in microstructured optical fibers. Finally, we referred the simulation results to the measured SHG efficiency in a microstructured side-hole germanium-doped silica fiber. The extended model should be applied for the fibers with loss beyond 0.01 dB/m. Even in such fibers, efficient SHG without an external second-harmonic beam is possible.
在中心对称材料中，二阶过程不应该发生，但观察到在二氧化硅光纤中有效二次谐波产生（SHG）引起了广泛关注。在这封信中，我们扩展了自组织 SHG 的理论模型，包括衰减，并研究了光纤损耗对自组织 SHG 过程的影响。我们对微结构光纤中的 SHG 能量转换效率进行了计算。最后，我们将模拟结果与微结构侧孔掺锗石英光纤中测量的 SHG 效率进行了比较。该扩展模型应适用于损耗超过 0.01 dB/m 的光纤。即使在这种光纤中，也可以实现没有外部二次谐波光束的高效 SHG。
