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Comparative investigation of the resistance and ability to trigger high voltage discharge for single and multiple femtosecond filaments in air

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Chinese Physics B 2013年第3期22卷 372-374页

作者：郭凯敏郝作强林景全孙长凯高勋赵振明 School of Science Changchun University of Science and Technology School of Physical Science and Technology Baotou Teachers College

A comparative investigation of the resistance and ability to trigger high voltage（HV） discharge for a single filament（SF） and multiple filaments（MFs） has been carried *** experimental results show that the trend of the breakdown threshold of the SF exactly follows that of its resistance,but this is not the case for the *** MF＇s resistance is much smaller than the SF＇***,the MF shows a slightly higher HV breakdown threshold than the *** underlying physics is that the measured resistance of the MF is collectively contributed by every filament in the MF while the HV breakdown threshold is determined by only one single discharging path.

关键词： femtosecond filament resistance high voltage breakdown threshold

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Population inversion in fluorescing fragments of super-excited molecules inside an air filament

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Chinese Physics B 2015年第1期24卷 36-42页

作者： See-Leang Chin 徐淮良 Department of Physics Engineering Physics and Optics & Center for Optics Photonics and Laser (COPL)Laval University Quebec QC G1V 0A6 Canada State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin University

An original idea is reviewed. When a molecule is pumped into a super-excited state, one of its decay channels is neutral dissociation. One or more of the neutral fragments will fluoresce. Hence, if a lower state of such fluorescing fragments was populated through other channels but with a lower probability, population inversion of the fluorescing fragments would be naturally realized. This idea seems to be validated, so far, by comparing published work on three hydrocarbon molecules, CH4, C2H2, C2H4, and water vapor, H2 O. After super-excitation in a femtosecond laser filament in air mixed with these molecules, the fluorescence from the CH or OH fragments exhibits population inversion, i.e., amplified spontaneous emission was observed in the backscattering direction of the filament.

关键词： femtosecond filament lasing super-excited states

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Plasma-grating-induced breakdown spectroscopy

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Advanced Photonics 2020年第6期2卷 9-13页

作者： Mengyun Hu Junsong Peng Sheng Niu Heping Zeng East China Normal University State Key Laboratory of Precision SpectroscopyShanghaiChina Chongqing Institute of East China Normal University ChongqingChina Jinan Institute of Quantum Technology JinanChina

.Laser-induced breakdown spectroscopy(LIBS)is a useful tool for determination of elements in solids,liquids,and *** nanosecond LIBS(ns-LIBS),the plasma shielding effect limits its reproducibility,repeatability,and signal-to-noise *** femtosecond laser filament induced breakdown spectroscopy(FIBS)has no plasma shielding effects,the power density clamping inside the filaments limits the measurement *** propose and demonstrate plasma-grating-induced breakdown spectroscopy(GIBS).The technique relies on a plasma excitation source-a plasma grating generated by the interference of two noncollinear femtosecond *** demonstrate that GIBS can overcome the limitations of standard techniques such as ns-LIBS and *** intensity enhancement with GIBS is observed to be greater than 3 times that of *** matrix effect is also significantly reduced with GIBS,by virtue of the high power and electron density of the plasma grating,demonstrating great potential for analyzing samples with complex matrix.

关键词： femtosecond filament plasma grating induced breakdown spectroscopy high power and electron density enhancement matrix effect.

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