Experimental study on spatial characteristics of filamentation and propagation of ultrashort pulse laser

被引：0
|
作者：
Wang, Pengcheng [1 ]
Pei, Zhehao [2 ]
Fu, Zhong [3 ]
Xiang, Nianwen [1 ]
Li, Haichen [1 ]
Wang, Sen [4 ]
Ye, Lin [4 ,5 ]
Tu, Jinlin [4 ]
Zhang, Xiaozhao [6 ]
Li, Guoqing [4 ,6 ]
机构：
[1] Hefei Univ Technol, Sch Elect Engn & Automat, Hefei, Peoples R China
[2] Xi An Jiao Tong Univ, Xian, Peoples R China
[3] State Grid Anhu Elect Power Co, Elect Power Res Inst, Hefei, Peoples R China
[4] Huaneng Renewables Corp Ltd, Beijing 100036, Peoples R China
[5] Huaneng New Energy Co Ltd, Yunnan Branch, Kunming 650000, Yunnan, Peoples R China
[6] China Huaneng Grp Co Ltd, Beijing 100031, Peoples R China
来源：
INTERNATIONAL CONFERENCE ON OPTOELECTRONIC MATERIALS AND DEVICES (ICOMD 2021) | 2022年 / 12164卷
基金：
中国国家自然科学基金;
关键词：
Ultrashort pulse laser; filament; Plasma filament; Auxiliary focusing; micro focusing; tight focusing; GENERATION;
D O I：
10.1117/12.2628604
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The induction effect of air gap discharge induced by ultrashort pulse laser will be affected by the characteristics of laser ionization filamentation. In order to study the spatial characteristics of ultrashort pulse laser ionization filamentation and propagation. Firstly, an experimental platform for studying the spatial characteristics of ultrashort pulse laser ionization filamentation and propagation is established. Then the axial and radial high-resolution optical images of filaments under the conditions of different focal length auxiliary focusing lens are obtained by using the combination of axial and radial detection method. The effectiveness of this observation method is proved by contrasting with the self-focusing and multiple filament correlation theory. By analyzing the relationship between the filament diameter and the laser propagation distance under the condition of 1m and 5m focal length lens assisted focusing, the effects of micro focusing and tight focusing on the filament distance are obtained. The experimental results show that the filament will continue to travel forward for a certain distance with the minimum optical diameter after reaching the minimum optical diameter in the micro focusing mode. So we can obtain a stable plasma channel in this way; In the tight focusing mode, the defocus effect of plasma plays a leading role in the laser propagation process faster. So the filament will disappear rapidly after reaching the minimum optical diameter, which is not conducive to the long-distance filament transmission.
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页数：7
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