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

摘要（ECS - 0080641）提出的研究的主要目标是开发一种紧凑的4.8 nm激光器，在类氢BV离子中过渡到基态。这个概念是对软x射线激光器（SXL）短波长的延伸，该激光器在普林斯顿大学被证明在13.5 nm的类h LiIII中过渡到基态。13.5 nm的SXL仅使用50 mJ， 250 fsec的抽运光束（强度：1-2倍），以2 Hz的重复率工作。在4.8 nm SXL上演示高增益长产物（GL）的步骤和实验装置与13.5 nm SXL相同，只是需要更高的强度（~）。这样的强度将可从我们的系统通过我们的12年历史的KrF大音量放大器翻新。转换到类氢BV离子基态的4.8 nm激光器将是波长最短、紧凑、高效的x射线激光器（“桌面”x射线激光器）。4.8 nm的激光是类h Li III离子向基态跃迁的13.5 nm激光最直接的短波长延伸。4.8 nm的类h BV离子的发展将为这类激光器在更短波长（在3.4 nm的CVI在“水窗”和更短的波长）的发展提供关键的尺度点。

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).