Spatio-temporal structure of a petawatt femtosecond laser beam
Spatio-temporal structure of a petawatt femtosecond laser beam
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DOI：
10.1088/2515-7647/ab250d
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发表时间：
2019-07-01
影响因子：
3.8
通讯作者：
Quere, Fabien
中科院分区：
文献类型：
--
作者：
Jeandet, Antoine;Borot, Antonin;Quere, Fabien
近几十年来，适用于超快激光的光学计量学的发展对这些光源的发展起了关键作用。在时间和空间上提供超短激光束完整场的测量技术正在得到发展。然而，到目前为止，它们还没有被应用到最强大的超短激光器上，这种激光器通过将啁啾脉冲放大（CPA）方案推向目前的技术极限，达到了PetaWatt的范围。这种情况让人们对他们的实际表现产生了怀疑，尤其是对他们在集中注意力时能达到的最高强度产生了怀疑。在这篇文章中，我们使用两种最近开发的独立测量技术，首次完整地描述了在全强度下工作的PetaWatt飞秒激光器BELLA激光器的时空特征。我们的研究结果表明，经过适当的优化，CPA技术仍然适用于这些极端尺度，即它不受时空耦合的固有限制。我们还展示了这些测量如何为这种激光系统的物理和操作机制提供前所未有的见解。
The development of optical metrology suited to ultrafast lasers has played a key role in the progress of these light sources in the last few decades. Measurement techniques providing the completeE-field of ultrashort laser beams in both time and space are now being developed. Yet, they had so far not been applied to the most powerful ultrashort lasers, which reach the PetaWatt range by pushing the chirped pulse amplification (CPA) scheme to its present technical limits. This situation left doubts on their actual performance, and in particular on the peak intensity they can reach at focus. In this article we present the first complete spatio-temporal characterization of a PetaWatt femtosecond laser operating at full intensity, the BELLA laser, using two recently-developed independent measurement techniques. Our results demonstrate that, with adequate optimization, the CPA technique is still suitable at these extreme scales, i.e. it is not inherently limited by spatio-temporal couplings. We also show how these measurements provide unprecedented insight into the physics and operation regime of such laser systems.