论文标题
Xuv频率梳子在散光的增强腔中的操作
XUV frequency comb operation in an astigmatism-compensated enhancement cavity
论文作者
论文摘要
我们已经开发了一种极端的紫外线（XUV）频率梳子，用于在高电荷离子（HCI）中发现的许多XUV转换上进行超高精度光谱。从100 MHz相稳定的近红外频率梳子中进行的飞秒脉冲会放大，然后在超高真空室内喂入飞秒增强腔（FSEC）。低分散fsec相干地超级可超过数百个入射脉冲，并且具有单个圆柱光学元件，完全补偿了$ W_0 =15μ$ m腰部腔焦点的散光。在那里安装了燃气喷气机后，强度达到$ \ sim10^{14} $ w/cm $^2 $以100 MHz的速率生成连贯的高谐波。我们将FSEC谐波从第7次到第35（42 eV; 30 nm）中脱颖而出，用于即将进行的HCI频率计量学实验。
We have developed an extreme ultraviolet (XUV) frequency comb for performing ultra-high precision spectroscopy on the many XUV transitions found in highly charged ions (HCI). Femtosecond pulses from a 100 MHz phase-stabilized near-infrared frequency comb are amplified and then fed into a femtosecond enhancement cavity (fsEC) inside an ultra-high vacuum chamber. The low-dispersion fsEC coherently superposes several hundred incident pulses and, with a single cylindrical optical element, fully compensates astigmatism at the $w_0=15μ$m waist cavity focus. With a gas jet installed there, intensities reaching $\sim10^{14}$ W/cm$^2$ generate coherent high harmonics with a comb spectrum at 100 MHz rate. We couple out of the fsEC harmonics from the 7th up to the 35th (42 eV; 30 nm) to be used in upcoming experiments on HCI frequency metrology.
