Acoustic Diagnostics of Femtosecond Laser Filamentation

被引：2

作者：

Shang, Binpeng ^{[1
]}

Zhang, Zhi ^{[1
]}

Zhang, Nan ^{[1
]}

Qi, Pengfei ^{[1
]}

Guo, Jiewei ^{[1
]}

Tao, Shishi ^{[1
]}

Lin, Lie ^{[1
]}

Liu, Weiwei ^{[1
]}

机构：

[1] Nankai Univ, Inst Modern Opt, Eye Inst, Tianjin 300350, Peoples R China

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2024年 / 36卷 / 07期

关键词：

Acoustics; Ultrafast optics; Laser pulses; Plasmas; Measurement by laser beam; Bandwidth; Acoustic pulses; Femtosecond laser filamentation; acoustic emission; dynamic evolution; frequency features; ENERGY DEPOSITION; PLASMA; DYNAMICS; PULSES; AIR;

D O I：

10.1109/LPT.2024.3370842

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 promising application of femtosecond laser filamentation in atmospheric remote sensing brings imperative demand for diagnosing the spatiotemporal dynamics of filamentation. Acoustic emission (AE) during filamentation opens the door to giving insight into the dynamic evolution of filaments in air. In particular, the frequency features of the acoustic emission provide relevant information on the conversion of laser energy to acoustic energy. The acoustic emission of femtosecond laser filament manipulated by laser pulse energy and focal lengths was measured quantitatively using a broadband microphone. The experimental results showed that the acoustic power W presents a squared dependence on the laser pulse energy ${E}$ , i.e. W proportional to E-2 . The spectral bandwidth of the acoustic pulse emitted from the optical filament is found to be an indicator of the filament intensity distribution, which is positively correlated with the laser filament intensity. These findings are helpful for studying the plasma filament properties and complex dynamic processes through acoustic diagnostics and benefit the remote applications of laser filament.

引用

页码：512 / 515

页数：4

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