We successfully constructed a pulse laser whose fundamental repetition rate is 2.6-GHz in Q-switched mode-lock oscillation. To the best of our knowledge, this is the highest repetition rate among silica glass fiber lasers. The laser cavity was constructed by a 40-mm-long Nd${}^{3+}$-doped single-mode silica glass fiber (Nd-SMF) and a SESAM as a saturable absorber. The core glass of the Nd-SMF was fabricated by a zeolite method and its concentration of Nd₂O₃ was 1.25 wt%. The maximum laser power reached 27.2 mW, and its slope efficiency and lasing thresholds were 19.6% and 7.3 mW. The peak wavelength of the oscillation was 1062.7 nm. The RF spectrum and the time-dependent waveform from a 20-GHz-bandwidth oscilloscope show a 2.6-GHz repetition rate of an Nd-SMF laser. We also discuss the conditions for achieving a CW-mode-lock (CML) oscillation, which is critical laser output ${\mathit{P}}_{\mathrm{out}}$ of 180 mW. Such a simple multi-GHz repetition rate laser will be available to make a compact frequency comb or a laser oscillator that will achieve ablation-cooled material removal in laser processing.

我们成功地构建了一个脉冲激光器，其基本重复率为 2.6 GHz 的 Q 开关锁模振荡。据我们所知，这是石英玻璃光纤激光器中最高的重复率。激光腔由 40 毫米长的 Nd${}^{3+}$掺杂单模石英玻璃光纤 (Nd-SMF) 和 SESAM 作为可饱和吸收器。Nd-SMF的芯玻璃采用沸​​石法制备，其Nd ₂ O ₃浓度为1.25wt%。最大激光功率达到27.2 mW，斜率效率和激光阈值分别为19.6%和7.3 mW。振荡的峰值波长为 1062.7 nm。来自 20 GHz 带宽示波器的 RF 频谱和时间相关波形显示了 Nd-SMF 激光器的 2.6 GHz 重复率。我们还讨论了实现 CW 锁模 (CML) 振荡的条件，这是关键的激光输出${\mathit{磷}}_{\mathrm{出去}}$180 兆瓦。这种简单的多 GHz 重复率激光器可用于制造紧凑型频率梳或激光振荡器，从而在激光加工中实现烧蚀冷却材料去除。