激光器
光学(聚焦)
瑞利长度
焦距
光学
色阶
瑞利散射
空腔
量子光学
物理
激光束
镜头(地质)
作者
D. H. Froula,D. Turnbull,Andrew Davies,T. J. Kessler,D. Haberberger,J. P. Palastro,S.-W. Bahk,I. A. Begishev,R. Boni,S. Bucht,J. Katz,Jessica Shaw
出处
期刊:Nature Photonics
[Springer Nature]
日期:2018-03-12
卷期号:12 (5): 262-265
被引量:137
标识
DOI:10.1038/s41566-018-0121-8
摘要
The controlled coupling of a laser to plasma has the potential to address grand scientific challenges1–6, but many applications have limited flexibility and poor control over the laser focal volume. Here, we present an advanced focusing scheme called a ‘flying focus’, where a chromatic focusing system combined with chirped laser pulses enables a small-diameter laser focus to propagate nearly 100 times its Rayleigh length. Furthermore, the speed at which the focus moves (and hence the peak intensity) is decoupled from the group velocity of the laser. It can co- or counter-propagate along the laser axis at any velocity. Experiments validating the concept measured subluminal (−0.09c) to superluminal (39c) focal-spot velocities, generating a nearly constant peak intensity over 4.5 mm. Among possible applications, the flying focus could be applied to a photon accelerator 7 to mitigate dephasing, facilitating the production of tunable XUV sources. By combining a chromatic focusing system with chirped laser pulses, the spatiotemporal distribution of the laser pulse is controlled in the focal region. The focal spot propagates over nearly 100 times its Rayleigh length at any velocity.
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