Study of airflow regime upon optic inside frequency multiplying device and achievement of cleaning technique

Hu, Shuo; Shang, Qiqi; Zhang, Peng; Chen, Jiaxuan; Zhang, Fanglei; Miao, Xinxiang

doi:10.1016/j.ijleo.2021.166777

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…Additionally, cleaning dust collectors still requires offline labor. An alternative would be to use gas knives [23,24] with airflow tails connected to the flow tunnel. In this case, invasive aerosols will depart with the background flow smoothly.…”

Section: Introductionmentioning

confidence: 99%

Low-speed gas knife protection for the large aperture optical component in high-power laser systems

Gao

Dong

et al. 2023

Front. Phys.

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In high-power laser systems, fused silica aerosols produced by laser-induced damage to optical components impede further improvement in operation efficiency. To mitigate aerosol threats, low-speed gas knives are an attractive online option. Herein, we investigate the protective mechanism of a low-speed gas knife (<20 m/s) against aerosol invasion on the optical component. First, aerosol particles invaded the surface experimentally in two ways and were detected both in the core and non-core regions, depending on the coverage area of the protection flow. Particle sedimentation percentages can directly reflect the protection capability of the gas knife flow. Since a “midstream defect” is readily apparent, a CFD model was developed to explain the phenomenon from the perspective of velocity distribution. Additionally, the Euler-Lagrange method was used to track airflow particle motions and reappear the protective process. The numerical and experimental results on protection efficiency are closely correlated. The numerical calculation indicates that the “midstream defect” manifested in the core region is possibly attributed to the turbulent dispersion and anisotropic near-wall effects of particles of various diameters, while in the non-core region, the mechanism differs. This work provides a framework for airflow clean designs inside high-power laser systems.

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Section: Introductionmentioning

confidence: 99%