论文标题
在低温下，在掺杂的纤维激光器中的神秘频率梳子
Mysterious frequency combs in erbium-doped fiber lasers at low temperatures
论文作者
论文摘要
我们报告了在低温下，在3 k和14 K之间的Erbium掺杂纤维激光器中的不一糖但有序的频率梳子的观察。在〜14 K时，梳子消失了。梳子包含约240条线，并具有不均匀的频率间距，从〜25 ghz开始于〜1540.5 nm，几乎单调地减小，至（1.8-2）nm内的〜100 MHz。我们讨论了它们是由于常规模式炸弹间距扩大而产生的，这是由于基于质数的孤立波，而没有四波混合或由收益光栅导致的。但是，我们认为梳子起源于多射线线，允许在不均匀的增益扩大，在低温下占主导地位，以及依赖性较小的均匀宽片宽部分，负责两条线之间的间距。
We report on the observation of puzzling nonuniform, but ordered, frequency combs in erbium-doped fiber lasers at low temperatures, between 3 K and 14 K. At ~14 K the combs disappear. The combs contain ~240 lines and have nonuniform frequency spacings that starts from ~25 GHz at ~1540.5 nm and decreases, almost monotonically, to ~100 MHz within (1.8-2) nm. We discuss possibilities that they result from enlarged regular mode-comb spacings, from prime numbers-based solitary waves free of four-wave mixing or result from gain gratings. However, we think that the combs originate from multi-lasing lines allowed in inhomogeneous gain broadening, dominant at low temperatures, together with a small power dependent homogeneous broadening part, responsible for the spacing between the lines.
