提出了一种基于切比雪夫馈电网络的13×14开口谐振环天线阵列。该天线阵列由天线单元和切比雪夫馈电网络组成。根据八木天线原理，该天线阵列设计的辐射贴片作为天线单元的引向器，金属地面作为反射器；辐射贴片由开口谐振环结构以及I型谐振结构组成，增强天线单元的辐射能力并提高增益；天线单元的馈电端由圆弧单极子组成，提高调节天线单元阻抗匹配的灵活性；电流矩阵指导非均匀电流分布切比雪夫馈电网络的设计，减小天线阵列的旁瓣；天线单元竖直插入馈电网络的基板，减少带有馈电网络阵列的口径大小。通过实物加工后，测试结果表明，该天线阵列在工作频率点10.1 GHz处实现了22.3 dBi的增益，E面和H面旁瓣电平分别为−16 dB和−17.66 dB，具有高增益、低副瓣的特点。

We demonstrate a simple method to obtain accurate optical waveforms with a gigahertz-level programmable modulation bandwidth and a watt-level output power for wideband optical control of free atoms and molecules. Arbitrary amplitude and phase modulations are transferred from microwave to light with a low-power fiber electro-optical modulator. The sub-milliwatt optical sideband is co-amplified with the optical carrier in a power-balanced fashion through a tapered semiconductor amplifier (TSA). By automatically keeping TSA near saturation in a quasi-continuous manner, typical noise channels associated with pulsed high-gain amplifications are efficiently suppressed. As an example application, we demonstrate interleaved cooling and trapping of two rubidium isotopes with coherent nanosecond pulses.

上海软X射线自由电子激光用户装置（SXFEL）是我国首台可以运行在水窗波段的自由电子激光装置，未来可以为5个实验线站供光，其主要运行模式为自放大自发辐射模式以及外种子模式。本文就SXFEL的外种子模式进行了从头到尾的模拟研究，主要包括EEHG-HGHG混合级联与单级EEHG两种方案。模拟结果表明，虽然EEHG-HGHG混合级联模式较为复杂，但能够产生更高功率的高次谐波辐射。除此之外，我们还研究了各种三维效应对EEHG的影响。模拟和分析结果表明，通过上述两种方案，采用紫外波段的种子激光，用户可以得到全相干、窄带宽、短脉冲的水窗波段自由电子激光。