Churkin D V, Sugavanam S, Tarasov N, Khorev S, Smirnov S V, Kobtsev S M, Turitsyn S K
1] Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK [2] Novosibirsk State University, 630090 Novosibirsk, Russia [3] Institute of Automation and Electrometry SB RAS, 1 Ac. Koptyug Avenue, 630090 Novosibirsk, Russia.
Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK.
Nat Commun. 2015 May 7;6:7004. doi: 10.1038/ncomms8004.
Physical systems with co-existence and interplay of processes featuring distinct spatio-temporal scales are found in various research areas ranging from studies of brain activity to astrophysics. The complexity of such systems makes their theoretical and experimental analysis technically and conceptually challenging. Here, we discovered that while radiation of partially mode-locked fibre lasers is stochastic and intermittent on a short time scale, it exhibits non-trivial periodicity and long-scale correlations over slow evolution from one round-trip to another. A new technique for evolution mapping of intensity autocorrelation function has enabled us to reveal a variety of localized spatio-temporal structures and to experimentally study their symbiotic co-existence with stochastic radiation. Real-time characterization of dynamical spatio-temporal regimes of laser operation is set to bring new insights into rich underlying nonlinear physics of practical active- and passive-cavity photonic systems.
从大脑活动研究到天体物理学等各个研究领域，都存在着具有不同时空尺度的过程共存和相互作用的物理系统。这类系统的复杂性使得其理论和实验分析在技术和概念上都具有挑战性。在此，我们发现，虽然部分锁模光纤激光器的辐射在短时间尺度上是随机且间歇性的，但从一个往返到另一个往返的缓慢演化过程中，它呈现出非平凡的周期性和长尺度相关性。一种用于强度自相关函数演化映射的新技术使我们能够揭示各种局部时空结构，并通过实验研究它们与随机辐射的共生共存。激光运行动态时空状态的实时表征将为实际有源和无源腔光子系统丰富的潜在非线性物理学带来新的见解。
