Ortaς B, Plötner M, Schreiber T, Limpert J, Tünnermann A
Opt Express. 2007 Nov 12;15(23):15595-602. doi: 10.1364/oe.15.015595.
We report on environmentally stable mode-locked Yb-doped all-fiber lasers operating in the wave-breaking-free and stretched-pulse regime. The compact linear cavity is constructed with saturable absorber mirror directly glued to the fibers end-facet as nonlinear mode-locking mechanism and chirped fiber Bragg grating for dispersion management, thus, without any free-space optics. In the wave-breaking-free regime the laser generates positively-chirped pulses with a pulse duration of 15.4 ps. These pulses are compressed to 218 fs in a hollow-core photonic bandgap fiber spliced to the output port. Adaptation of dispersion management has led to operation in the stretched-pulse regime, where a parabolic spectral profile is obtained as well. In this regime pulses are compressible to 213 fs. Numerical simulations are presented which confirm the wave-breaking-free and stretched-pulse evolution inside the fiber laser cavity. Both regimes are compared in terms of pulse quality.
我们报道了在无波破碎和拉伸脉冲 regime 下运行的环境稳定锁模掺镱全光纤激光器。紧凑的线性腔由直接粘贴在光纤端面的可饱和吸收镜作为非线性锁模机制和用于色散管理的啁啾光纤布拉格光栅构成，因此无需任何自由空间光学元件。在无波破碎 regime 中，激光器产生脉宽为 15.4 ps 的正啁啾脉冲。这些脉冲在与输出端口熔接的空心光子带隙光纤中被压缩至 218 fs。色散管理的调整导致了在拉伸脉冲 regime 下的运行，在此 regime 中也获得了抛物线形光谱轮廓。在该 regime 中，脉冲可被压缩至 213 fs。给出了数值模拟，证实了光纤激光腔内的无波破碎和拉伸脉冲演化。对这两种 regime 的脉冲质量进行了比较。
