Intense XUV sub-fs pulses using extreme soliton dynamics in hollow-core fibers

在空心光纤中使用极端孤子动力学的强 XUV 亚飞秒脉冲

• 批准号: 398414949
• 负责人: Professor Dr. Uwe Morgner
• 金额: --
• 依托单位: Institut für Quantenoptik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/398414949?language=en
• 关键词: Intense; XUV; sub; fs; pulses

Generation of bright attosecond-long XUV pulses is of immanent importance for various applications. Currently, the only way is to employ high harmonic generation (HHG), which suffers from rather low conversion efficiencies. Here, an alternative approach is proposed, allowing, according to preliminary simulations, for up to 5 % conversion efficiency to pulses with durations shorter than 500 as at wavelengths down to 50 nm. The method is based on the optical Kerr effect and exploits dynamics of few-cycle intense pulses in modern hollow-core "kagome" fibers filled with helium. Generation of new frequencies from soliton propagation in fibers is well known, but here a fundamentally new regime is exploited by using a) extremely short input pulses and b) highest possible intensities. After a few cm of propagation, such pulses will emit resonant radiation in the XUV range. The XUV pulses chirp can be compensated by linear propagation in a pre-ionized gas. Critical for success is the preparation of few-cycle short pulses of approx. 5 fs duration with around 20 µJ of energy, which will be accomplished by a home-built OPCPA setup.

对于各种应用，产生明亮的Xuv脉冲是至关重要的。当前，唯一的方法是员工高谐波生成（HHG），其转化效率相当低。在这里，提出了一种替代方法，根据初步模拟，在波长降至50 nm的波长下，转化效率最高为5％。该方法基于光学KERR效应，并利用现代空心核心“ Kagome”纤维中的几个周期强脉冲的动力学。众所周知，纤维中孤子传播的新频率产生了新频率，但是通过使用a）极短的输入脉冲和b）最高可能的强度来探索从根本上探索新的新制度。经过几厘米的传播后，此类脉冲将在XUV范围内发出共振辐射。 XUV脉冲chirp可以通过预先离子的气体中的线性传播来补偿。成功至关重要的是制备大约几个周期的短脉冲。 5 fs持续时间约为20 µj的能量，这将通过自制的OPCPA设置来完成。