Development of 4.8 nm Laser in Transition to Ground State of BV Ions

摘要(ECS-0080641)这项研究的主要目标是在类氢BV离子的基态跃迁中发展一种紧凑的4.8 nm激光器。这一概念是软X射线激光(SXL)向更短波长的延伸，该激光在普林斯顿大学被证明在13.5 nm的类氢LiIII中跃迁到基态。13.5 nm SXL仅使用50 mJ，250 fs的泵浦光束(强度：1-2 x)以2赫兹的重复频率运转。演示4.8 nm SXL的高增益长度积(GL)的过程和实验装置与13.5 nm SXL相同，只是需要更高的强度(~)。这样的强度将从我们的系统中通过翻新我们12年的KRF大容量放大器来获得。过渡到类氢BV离子基态的4.8 nm激光将是波长最短、结构紧凑、效率非常高的X射线激光(“台式”X射线激光)。对4.8 nm激光的演示将是对13.5 nm激光跃迁到类氢锂离子基态的最直接的延伸。类氢BV离子中4.8 nm的发展将为这类短波长激光的发展提供关键的标度点(在水窗口中的CVI中为3.4 nm，甚至更短的波长)。

ABSTRACT ( ECS - 0080641)The main goal of the proposed research is the development of a compact 4.8 nm laser in a transition to the ground state in hydrogen-like BV ions. This concept is an extension toward shorter wavelength of the Soft X-ray Laser (SXL),which was demonstrated at Princeton in transition to the ground state in H-like LiIII at 13.5 nm.The 13.5 nm SXL operates at a repetition rate of 2 Hz using only a 50 mJ, 250 fsec pumping beam (intensity: 1-2 x ). The procedure and experimental set-up for the demonstration of high gain-length product (GL) for the 4.8 nm SXL is the same as that of the 13.5 nm SXL, except much higher intensities are required (~ ). Such intensities will be available from our system through the refurbishing of our 12-year old KrF large volume amplifier. The 4.8 nm laser in transition to ground state of hydrogen-like BV ions would be the shortest wavelength compact, very efficient X-ray laser ("Table top" X-ray laser). Demonstration of the lasing at 4.8 nm would be the most straight-forward extension to shorter wavelength of 13.5 nm laser in transition to ground state of H-like Li III ions. Development of 4.8 nm in H-like BV ions will provide crucial scaling point for the development of this type of lasers at shorter wavelength (at 3.4 nm in CVI in "water window" and at even shorter wavelengths).