Influence of pressure on spectral broadening of femtosecond laser pulses in air

被引：7
|
作者：
Zhang, He [1 ,2 ]
Zhang, Yun [1 ,2 ]
Lin, Shuang [1 ,2 ]
Zhang, Yunfeng [3 ]
Chen, Anmin [1 ,2 ]
Jiang, Yuanfei [1 ,2 ]
Li, Suyu [1 ,2 ]
Jin, Mingxing [1 ,2 ,4 ]
机构：
[1] Jilin Univ, Inst Atom & Mol Phys, Changchun 130012, Peoples R China
[2] Jilin Univ, Jilin Prov Key Lab Appl Atom & Mol Spect, Changchun 130012, Peoples R China
[3] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Peoples R China
[4] Space Engn Univ, State Key Lab Laser Prop & Applicat, Beijing 101416, Peoples R China
来源：
PHYSICS OF PLASMAS | 2021年 / 28卷 / 04期
基金：
中国国家自然科学基金;
关键词：
This work was supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307701); the National Natural Science Foundation of China (Grant Nos. 11704145; 11974138; 11674128; 11504129; and; 11674124); and the Scientific Research Project of Jilin Provincial Department of Education during the 13th Five-year Plan Period (Grant No. JJKH20190181KJ);
D O I：
10.1063/5.0042998
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Spectral broadening is an important nonlinear effect during the interaction of intense femtosecond laser pulses with air. In this paper, we experimentally study the dependence of spectral broadening on pressure and pulse energy. It is found that increasing both pressure and pulse energy can enhance the spectral intensity, while only increasing pressure leads to obvious blue shift of spectra, and the pulse energy has little effect on it. To get a better insight of the mechanism of spectral broadening, the numerical simulation relating the instantaneous frequency to the time dependent pulse intensity and time dependent plasma density in air is carried out. The results indicate that the plasma generation induced self-phase modulation which is related to the pressure plays an important role in blue shift of spectrum. Besides the transmission of the laser pulse is measured and decreases with pressure. It proves that the energy transfer of the laser pulse is promoted by pressure. This study will be helpful to understand a deeper physical mechanism of femtosecond filament induced supercontinnum generation in air.
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收藏
页数：8
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