Toward 3D imaging of femtosecond laser filament in air by a CCD within a single exposure

We experimentally demonstrated the 3D propagation of laser filament in air by an Fabry-Pérot (F-P) cavity assisted imaging within a single exposure. The F-P cavity was composed of two parallel mirrors with certain reflectivity and transmission at filament laser, so that the beam was reflected and re...

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Published in:Optics express 2023-02, Vol.31 (4), p.6938-6946
Main Authors: Wei, Yingxia, Wang, Tiejun, Long, Juan, Yin, Fukang, Ding, Xinyi, Zhu, Bin, Zhou, Kainan, Bin, Jianhui, Leng, Yuxin
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container_end_page 6946
container_issue 4
container_start_page 6938
container_title Optics express
container_volume 31
creator Wei, Yingxia
Wang, Tiejun
Long, Juan
Yin, Fukang
Ding, Xinyi
Zhu, Bin
Zhou, Kainan
Bin, Jianhui
Leng, Yuxin
description We experimentally demonstrated the 3D propagation of laser filament in air by an Fabry-Pérot (F-P) cavity assisted imaging within a single exposure. The F-P cavity was composed of two parallel mirrors with certain reflectivity and transmission at filament laser, so that the beam was reflected and refracted multiple times between the two mirrors. The cross-sectional intensity patterns at different longitudinal positions along filament within a single exposure of CCD (Charge-coupled Device) were recorded. When keeping the incident angle of the F-P cavity as a constant and reducing its spacing distance, a better longitudinally resolved evolution of cross-sectional filament intensity patterns was obtained. The intensity evolution along laser filament by the F-P cavity assisted imaging method was consistent with the filament fluorescence measurement from the side. As an application, the transition of laser propagation from linear to nonlinear was unveiled by the F-P cavity assisted 3D imaging.
doi_str_mv 10.1364/OE.482082
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title Toward 3D imaging of femtosecond laser filament in air by a CCD within a single exposure
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