A cladding-pumped all-fiber chirped femtosecond pulse Yb-doped mode-locked laser operating near 977 nm was demonstrated for the first time. Nonlinear polarization evolution was used as the mode-locking mechanism. The laser was self-starting and extremely stable (the stability of the repetition rate of 41.6 MHz was better than that of 15 Hz). Amplification near 977 nm was achieved using a specially designed cladding-pumped Yb-doped fiber. The main feature of the current laser design was its increased intracavity nonlinearity, which resulted in a strong self-phase modulation and significant widening of the generated pulse spectrum. This nonlinearity allowed us to generate pulses compressible down to a duration of 230 fs using an external diffraction grating compressor.

中文翻译：

---

使用锁模全光纤激光器产生接近 977 nm 的啁啾飞秒脉冲

首次展示了工作在 977 nm 附近的包层泵浦全光纤啁啾飞秒脉冲掺镱锁模激光器。非线性偏振演化被用作锁模机制。激光器自启动，极其稳定（41.6 MHz的重复频率稳定性优于15 Hz）。使用专门设计的包层泵浦掺镱光纤实现了接近 977 nm 的放大。当前激光器设计的主要特点是增加了腔内非线性，这导致了强烈的自相位调制和产生的脉冲光谱的显着加宽。这种非线性使我们能够使用外部衍射光栅压缩器生成可压缩到 230 fs 持续时间的脉冲。