Turing patterns and solitons are a common occurrence in systems that are out of equilibrium. For example, they regulate the emergence of organised structures in biology and chemistry. In optics, the study of temporal Turing rolls and cavity-solitons in nonlinear micro-cavity resonators has been key to the understanding of optical frequency comb formation in these structures. Over a decade, the impact of microresonator-based approaches to generating frequency combs – so-called “Micro-combs or “Kerr combs” – has reached far beyond metrology applications. Here we summarise our theoretical and experimental results for solitons and Turing patterns in a system comprising a micro-resonator nested in an auxiliary fibre-gain cavity.
Real-time measurements are now mature enough to cover a wide span of applications from fundamental laser physics and dynamics to applied sciences. In this talk, we focus on the application of time-stretch techniques for the ultrafast imaging of non-repetitive ultrafast events. In particular, we show that amplified time-stretch imaging fills the gap between ultra-high frame rate imaging techniques (burst-mode and/or temporal mapping cameras) and continuous imagers (CCD/CMOS) as it allows MHz frame rates on long - ms - timescales. As an illustration, we demonstrate the real-time tracking - i.e. propagation and reflection - of single laser-induced shockwaves (SWs) with velocities exceeding a few km/s and show that it allows, on the one hand, to monitor its full dynamics, from its deceleration to the observation of the plasma contact wave, and, on the other hand, to easily acquire intensity and velocity statistics on large ensembles of SWs [1]. This study has numerous potential applications in applied physics e.g. in the study of transient phenomena in pulsed laser-material interactions as these dynamics indeed strongly impact many scientific fields such as micromachining, material analysis or high-harmonics generation, to name a few. We also report the use of 1-D amplified time-stretch imaging to capture the rupture of liquid ligaments, which could bring new insights in two-phase flows physics.
[1] Hanzard et al., Appl. Phys. Lett. 112, 161106 (2018)
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