Cumulative Effects in 100 kHz Repetition‐Rate Laser‐Induced Plasma Filaments in Air. Issue 3 (31st January 2023)

• Record Type: Journal Article
• Authors: Wang, Tie-Jun; Ebrahim, Mehdi H.; Afxenti, Ivi; Adamou, Dionysis; Dada, Adetunmise C.; Li, Ruxin; Leng, Yuxin; Diels, Jean-Claude; Faccio, Daniele; Couairon, Arnaud; Milián, Carles; Clerici, Matteo
• Is Part Of: Advanced photonics research. Volume 4:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-31
• Subjects: filaments -- fluorescence -- high-repetition-rate -- hydrodynamic models -- light–matter interaction -- plasma; Photonics -- Periodicals; 621.36505
• DOI: 10.1002/adpr.202200338
• Languages: English
• ISSNs: 2699-9293

Abstract

Abstract : Cumulative effects are crucial for applications of laser filaments, such as for the remote transfer of energy and the control of electric discharges. Up to now, studies of cumulative effects in the air of high‐repetition‐rate pulse trains have been performed at lower rates than 10 kHz. Herein, the nonlinear effects associated with short plasma filaments produced by pulses of moderate energy (0.4 mJ per pulse) and repetition rates up to 100 kHz are experimentally characterized. With increasing repetition rate, a decrease in absorption, fluorescence emission, and breakdown voltage and concurrently an increase in peak intensity and third‐harmonic‐generation efficiency are observed. Hydrodynamic simulations of the heated gas show that the observed decreases are directly related to a quasi‐stationary state of reduced gas density in the filament. However, further investigations are required to fully understand the physics underpinning the observed sharp reduction of the breakdown voltage at 100 kHz repetition rates. The results may prove relevant for energy and information delivery applications by laser‐induced air waveguide or electric discharge and lightning control. Abstract : Herein, properties of laser‐induced plasma filaments are investigated at varying repetition rates up to 100 kHz and for pulse energies up to 0.4 mJ. Nonlinear losses, fluorescence emission, and breakdown voltage decrease with the repetition rate, while peak intensity and third‐harmonic‐generation efficiency increase. Hydrodynamic simulations show that the observed effects are related to a quasi‐stationary state of reduced gas density.