ABSTRACT

In this work, we review our recent investigations on the behavior of a polarization-maintaining passively mode-locked ytterbium-doped laser in two different cavity configurations, namely: fiber-ring (FR) and Fabry-Perot (FP). Opposed to standard configurations that rely on the use of strong filtering within the cavity by including an ad hoc component with this purpose, here the filtering action is solely performed by the spectral overlapping of the different components within the fiber lasers. We found that the lack of a specific filter within the cavity does not deteriorate the performance as compared with previous works. We also report the changes in the output light pulses when the net dispersion of the cavity was varied. Additionally, different lengths of an ad hoc anomalous polarization-maintaining (PM) photonic crystal fiber (PCF) were used as intracavity dispersion compensator, to shift the operation of the laser from net-normal to the net-anomalous regime. The shortest output light pulses [6 ps (FR) and 8 ps (FP)] were obtained when the net-cavity dispersion approached zero. Since the obtained light pulses were far to be transform-limited, we also discuss the possibility of out-of-cavity recompression by using the same PM-PCF mentioned above. After recompression, pulse widths of 3 ps were obtained, limited by the available length of PM PCF.

抽象的

在这项工作中，我们回顾了我们对偏振保持被动锁模掺y激光器在两种不同腔结构（即光纤环（FR）和法布里-珀罗（FP））中的行为的最新研究。与标准配置相反，该标准配置通过为此目的包括一个特设组件而依赖于在腔体内使用强滤波，在此，滤波操作仅由光纤激光器内不同组件的光谱重叠来执行。我们发现，与以前的工作相比，腔体内缺少特定的过滤器不会降低性能。我们还报告了当腔的净色散变化时输出光脉冲的变化。此外，不同长度的临时文件异常保偏（PM）光子晶体光纤（PCF）被用作腔内色散补偿器，以将激光器的操作从净法线转换为净异常状态。当净腔色散接近零时，获得最短的输出光脉冲[6 ps（FR）和8 ps（FP）]。由于获得的光脉冲远不受变换限制，因此，我们还讨论了使用上述相同的PM-PCF进行腔外再压缩的可能性。重新压缩后，获得3 ps的脉冲宽度，受限于PM PCF的可用长度。