We investigate power scaling of ultrashort-pulse enhancement cavities. We propose a model for the sensitivity of a cavity design to thermal deformations of the mirrors due to the high circulating powers. Using this model and optimized cavity mirrors, we demonstrate 400 kW of average power with 250 fs pulses and 670 kW with 10 ps pulses at a central wavelength of 1040 nm and a repetition rate of 250 MHz. These results represent an average power improvement of one order of magnitude compared to state-of-the-art systems with similar pulse durations and will thus benefit numerous applications such as the further scaling of tabletop sources of hard x rays (via Thomson scattering of relativistic electrons) and of soft x rays (via high harmonic generation).
展开▼
机译：我们研究超短脉冲增强腔的功率缩放。我们提出了一个模型，用于腔设计对由于高循环功率引起的镜子热变形的敏感性。使用此模型和优化的腔镜，我们展示了250 s fs脉冲的平均功率400 kW和10 ps ps脉冲的670 kW的中心波长为1040 nm，重复频率为250 MHz。这些结果表明，与具有相似脉冲持续时间的最新系统相比，平均功率提高了一个数量级，因此将有益于许多应用，例如进一步缩放硬X射线的台式光源（通过相对论的Thomson散射）电子）和软X射线（通过高次谐波产生）。
展开▼
