Journal ArticleDOI
Millisecond-long suppression of spectroscopic optical signals using laser filamentation.
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TLDR
It is demonstrated that the transient change in refractive index associated with relaxation of the gas can be used to reject both continuous and time-varying spectroscopic signals, including emission from laser-produced plasmas, which can augment temporal gating of simple optical detectors.Abstract:
Ultrashort laser pulse filamentation in air can extend the delivery of focused laser energy to distances greatly exceeding the Rayleigh length. In this way, remote measurements can be conducted using many standard methods of analytical spectroscopy. The performance of spectroscopic techniques can be enhanced by temporal gating, which rejects the unwanted noise and background. In the present work, we investigate the thermal relaxation of air in the wake of single-filament plasmas using shadowgraphy. We demonstrate that the transient change in refractive index associated with relaxation of the gas can be used to reject both continuous and time-varying spectroscopic signals, including emission from laser-produced plasmas. This method can augment temporal gating of simple optical detectors.read more
Citations
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Atmospheric Aerosol Clearing by Femtosecond Filaments
TL;DR: In this paper , the authors directly measured and simulated the dynamics of water droplets with a radius of about 5 μ m, typical of fog, under the influence of optical and acoustic interactions that are characteristic of femtosecond filaments.
Journal ArticleDOI
Cumulative Effects in 100 kHz Repetition‐Rate Laser‐Induced Plasma Filaments in Air
Tie-Jun Wang,Mehdi Ebrahim,Ivi Afxenti,Dionysis Adamou,Adetunmise C. Dada,Ruxin Li,Yuxin Leng,Jean-Claude Diels,Daniele Faccio,Arnaud Couairon,Carles Milián,Matteo Clerici +11 more
TL;DR: In this paper , the cumulative effects of high-repetition-rate pulse trains have been investigated for short plasma filaments produced by pulses of moderate energy (0.4mJ) and repetition rates up to 100 kHz.
References
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Journal ArticleDOI
Long-Lived Waveguides and Sound Wave Generation by Laser Filamentation
Oren Lahav,Liad Levi,Itai Orr,R. A. Nemirovsky,Jonathan Nemirovsky,Ido Kaminer,Mordechai Segev,Oren Cohen +7 more
TL;DR: In this article, the authors discover long-lived (microsecond-scale) optical waveguiding in the wake of atmospheric laser filaments and observe the formation and then outward propagation of the consequent sound wave.
Journal ArticleDOI
Generation of long-lived underdense channels using femtosecond filamentation in air
TL;DR: Using femtosecond laser pulses at 800 and 400 nm, this article characterized the formation of underdense channels in air generated by laser filamentation at the millijoule energy level by means of transverse interferometry.
Journal ArticleDOI
Generation of long-lived underdense channels using femtosecond filamentation in air
TL;DR: Using femtosecond laser pulses at 800 and 400 nm, this paper characterized the formation of underdense channels in air generated by laser filamentation at the millijoule energy level by means of transverse interferometry.
Journal ArticleDOI
Spaceborne laser filamentation for atmospheric remote sensing
Posted Content
Long-Lived Waveguides and Sound Wave Generation by Laser Filamentation
Liad Levi,Oren Lahav,R. A. Nemirovsky,Jonathan Nemirovsky,Itai Orr,Ido Kaminer,Mordechai Segev,Oren Cohen +7 more
TL;DR: In this article, the authors discover long-lived (microsecond-scale) optical waveguiding in the wake of atmospheric laser filaments and observe the formation and then outward propagation of the consequent sound wave.