Yang Kangwen, Wu Jiamei, Ao JianPeng, Hao Qiang, Yan Ming, Huang Kun, Ji Minbiao, Zeng Heping
Opt Express. 2022 Feb 28;30(5):7636-7646. doi: 10.1364/OE.448975.
We report the generation of parabolic pulses with broadband spectrum from a core-pumped Yb-doped fiber amplifier seeded by a dispersion managed fiber oscillator. The net cavity dispersion of Yb-doped oscillator was continuously changed from 0.074 to -0.170 ps, which enabled us to achieve dissipative soliton, stretched pulse and soliton mode-locking operations. Spectral evolution processes in the core-pumped nonlinear fiber amplifier seeded by various input solitons were investigated experimentally and theoretically. Our finding indicates that cavity dispersion of oscillator can be used to engineer the input pulse parameter for amplifier, thus forming a pre-chirper free fiber amplification structure. In the experiment, we obtained 410-mW parabolic pulses with spectral bandwidth up to 56 nm. In combination with a passively synchronized frequency-doubled Er-doped fiber laser, we have demonstrated coherent anti-Stokes Raman imaging. The compact dual-color fiber laser source may facilitate practical applications of nonlinear biomedical imaging beyond the laboratory environment.
我们报道了利用色散管理光纤振荡器作为种子源，由纤芯泵浦的掺镱光纤放大器产生具有宽带光谱的抛物线脉冲。掺镱振荡器的净腔色散从0.074皮秒连续变化到 -0.170皮秒，这使我们能够实现耗散孤子、拉伸脉冲和孤子锁模运转。对由各种输入孤子作为种子源的纤芯泵浦非线性光纤放大器中的光谱演化过程进行了实验和理论研究。我们的发现表明，振荡器的腔色散可用于设计放大器的输入脉冲参数，从而形成一种无需预啁啾器的光纤放大结构。在实验中，我们获得了光谱带宽高达56纳米、功率为410毫瓦的抛物线脉冲。结合被动同步的倍频掺铒光纤激光器，我们展示了相干反斯托克斯拉曼成像。这种紧凑的双色光纤激光源可能会推动非线性生物医学成像在实验室环境之外的实际应用。
