Compact, high-energy ultrafast sources at less exploited fiber gain wavelengths can enable various applications. Here, a high pulse-energy (138 nJ) femtosecond (390 fs) laser source with a center wavelength around 950 nm is demonstrated by frequency-doubling of ultrafast pulses from a thulium-doped fiber chirped-pulse amplification system. The thulium-doped fiber system generates an average output power of 6.5 W around a wavelength of 1.9 µm whose pulses (703 nJ) can be compressed to a pulse duration of 490 fs. This ultrafast 950 nm source offers an attractive system for applications, including two-photon microscopy, and marks the highest-energy fiber system at this wavelength to date.

中文翻译：

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950 nm 高能倍频掺铥光纤啁啾脉冲放大系统

紧凑、高能超快光源在较少使用的光纤增益波长下可以实现各种应用。在这里，通过来自掺铥光纤啁啾脉冲放大系统的超快脉冲的倍频，演示了中心波长约为 950 nm 的高脉冲能量 (138 nJ) 飞秒 (390 fs) 激光源。掺铥光纤系统在 1.9 µm 波长附近产生 6.5 W 的平均输出功率，其脉冲 (703 nJ) 可压缩至 490 fs 的脉冲持续时间。这种超快 950 nm 光源为双光子显微镜等应用提供了极具吸引力的系统，并标志着迄今为止该波长下能量最高的光纤系统。