Observation of centrally converging airflow columns induced by heat accumulation in high-repetition-rate femtosecond laser filaments

IF 5.2 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2026-06-01 Epub Date: 2026-02-11 DOI:10.1016/j.optlastec.2026.114918

Zheyuan Hou , Xinyu Liu , Tie-Jun Wang , Yaoxiang Liu , Yingxia Wei , Xianwang Li , Yuxin Leng

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引用次数: 0

Abstract

This study first reveals a thermally driven airflow phenomenon in high-repetition-rate (1 ∼ 100 kHz) femtosecond laser filaments, characterized by the formation of a stable, perpendicularly oriented central converging airflow column. Using transverse optical shadowgraphy, we directly visualize the filament-induced flow dynamics and find that the airflow intensity and spatial coherence increase almost linearly with repetition rates above 10 kHz. Thermofluidic simulations indicate that cumulative heat deposition from successive pulses governs the evolution of airflow column, transforming initially diffuse vortices into a symmetric dual-vortex structure. And the particle-tracing simulations confirm that acoustic heating contributes negligibly to the overall flow dynamics. These findings further confirm that heat accumulation plays a predominant role in governing filament–air interactions and reveal a distinct thermally induced converging airflow phenomenon, offering new insight into the thermal dynamics of high-repetition-rate filamentation.

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高重复率飞秒激光细丝热积累引起的中心辐合气流柱的观察

该研究首先揭示了高重复率（1 ~ 100 kHz）飞秒激光细丝中热驱动的气流现象，其特征是形成稳定的、垂直定向的中央收敛气流柱。利用横向光学阴影成像技术，我们直接看到了灯丝诱导的流动动力学，并发现气流强度和空间相干性随着重复频率在10 kHz以上几乎呈线性增加。热流体模拟表明，连续脉冲的累积热沉积控制了气流柱的演化，将最初的弥漫性涡转变为对称的双涡结构。粒子示踪模拟证实了声加热对整体流动动力学的影响可以忽略不计。这些发现进一步证实了热积累在控制丝-空气相互作用中起主导作用，并揭示了一种独特的热诱导辐合气流现象，为高重复率丝的热动力学提供了新的见解。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems