We report on a 1.7 µm Tm-fiber chirped pulse amplification (CPA) system by virtue of a broadband dissipative soliton seed laser. The seed oscillator delivers the dissipative soliton with 10 dB spectral bandwidth of 23 nm and an average power of 4 mW. The duration of the seed pulse is directly stretched to ${\sim}{60}\;{\rm ps}$ by a segment of 50 m normal dispersion fiber. Using a two-stage fiber amplifier, the average power of the pulse is amplified to 1.95 W with a slope efficiency of 40.3%. The amplified pulse is then compressed to 348 fs by a pair of fused silica transmission gratings. The compressed average power of 1.3 W and peak power of 155 kW are achieved. These experimental results would pave the way to achieve a high-power femtosecond laser source at 1.7 µm, which could find important applications in fields such as three-photon deep-tissue imaging and material processing.

中文翻译：

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具有耗散孤子种子激光器的 1.7 µm Tm 光纤啁啾脉冲放大系统

我们通过宽带耗散孤子种子激光器报告了 1.7 µm Tm 光纤啁啾脉冲放大 (CPA) 系统。种子振荡器提供具有 10 dB 光谱带宽 23 nm 和平均功率 4 mW 的耗散孤子。种子脉冲的持续时间直接拉伸到${\sim}{60}\;{\rm ps}$由一段 50 m 的正常色散光纤组成。使用两级光纤放大器，脉冲的平均功率放大到 1.95 W，斜率效率为 40.3%。然后放大的脉冲被一对熔融石英传输光栅压缩到 348 fs。实现了 1.3 W 的压缩平均功率和 155 kW 的峰值功率。这些实验结果将为实现 1.7 µm 高功率飞秒激光源铺平道路，在三光子深层组织成像和材料加工等领域有重要应用。