Article
Physics, Fluids & Plasmas
Laurent Ariztia, Alexey Zhabin, Ivan Lavrinovich, Antoine Silvestre de Ferron, Marc Rivaletto, Bucur M. Novac, Laurent Pecastaing
Summary: This article presents the electrical and mechanical design of a compact 13-stage 0.5-MV Marx generator operating at a puke repetition frequency of 100 Hz. The use of corona-stabilized electrodes improves operational stability and pulse repetition frequency.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Computer Science, Information Systems
Yaobin Jin, Li Cheng
Summary: This paper presents a solid-state boost-Marx pulse generator (BMPG) using an inductor as an isolation device and a switch to amplify the output voltage. It solves the problems of conventional generators where the isolation resistor affects the charging speed and total efficiency. The selection criteria for inductors and the performance of the circuit are verified through tests.
Article
Instruments & Instrumentation
A. S. Patel, K. Senthil, Rakhee Menon, Ankan Basak, Romesh Chandra, S. Mitra, Amitava Roy
Summary: Flash x-ray (FXR) systems are used for dynamic radiography, requiring very short pulse durations to avoid motion blur. Conventional Marx generators do not meet the requirements due to higher inductance, thus a coaxial Marx generator has been designed to generate the desired peak voltages and current within a 40 ns pulse duration.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Optics
Qiang Gao, Zhifeng Zhu, Bo Li, Lei Han, Zhongshan Li
Summary: In this study, the evolution of discharge plasma is investigated using a femtosecond laser filament to trigger and guide a high-voltage discharge. The spectra of the plasma channel with high spatiotemporal resolution are measured using an imaging spectrometer. The whole process is divided into three stages based on spectral emission features, and the streamer propagation velocity is calculated to be about 3 x 10(5) m/s. The atomic emissions from the discharge plasma triggered by the laser filament can be utilized for one-dimensional component measurements of flow fields.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Physics, Fluids & Plasmas
Ejlal Shahriari, Thomas Maysonnave, Anton I. Gusev, Antoine Silvestre de Ferron, Laurent Pecastaing
Summary: This article investigates the possibility of triggering large-area thyristors in impact-ionization wave mode using a Marx generator equipped with a peaking module. The experimental results show that, by applying appropriate trigger pulses to the thyristors, high-speed switching can be achieved with short switch time and high current rise rate.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Engineering, Multidisciplinary
E. Yu. Burkin, V. V. Sviridov, P. Yu. Chumerin
Summary: This paper describes a pulsed magnetron system that generates high-energy microwave pulses. A circuit with 12 identical transistor modules is used to generate a magnetron current pulse, which is transformed into a high-voltage pulse using a pulse transformer. Experimental data shows the system operates effectively.
INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
(2023)
Article
Environmental Sciences
Offir Inbar, Alexandra Chudnovsky, Kevin Ohneiser, Albert Ansmann, Stanislav Ratner, Roman Sirota, Yaron Aviv, Dror Avisar
Summary: Atmospheric water is considered as an alternative sustainable solution for global water scarcity, with its chemical characteristics being influenced by meteorological and air-quality parameters. Different pollution sources have a strong impact on water quality, and the presence of sea salt aerosols and seasonal climate conditions affect the concentration of elements in water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Optics
Litong Xu, Dongwei Li, Junwei Chang, Deming Li, Tingting Xi, Zuoqiang Hao
Summary: We demonstrate the generation of powerful supercontinuum vortices from femtosecond vortex beams using multiple thin fused silica plates, both numerically and experimentally. The generated supercontinuum vortices preserve the vortex phase profile of the initial beam within a spectral range of 500 nm to 1200 nm. This is achieved by inhibiting multiple filamentation and maintaining a relatively uniform intensity distribution of the vortex ring through the thin-plate scheme, which primarily relies on self-phase modulation and self-steepening effects. Our method works effectively for vortex beams with different topological charges, providing a simple and efficient approach to generate high-power supercontinuum vortices.
PHOTONICS RESEARCH
(2022)
Article
Physics, Fluids & Plasmas
J. J. van Oorschot, T. Huiskamp
Summary: A new pulsed power supply was developed to study the impact of high-voltage pulse shape on the generation of plasma-activated water (PAW). This article presents the design and implementation of the generator, as well as its performance evaluation on resistive loads. The implemented generator is capable of producing pulses with a duration ranging from 25 ns to μs, a voltage of 20 kV, and a repetition rate of up to 10 kHz, while achieving an 8 ns rise time and arbitrary pulse shape.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
U. Shanmuganathan, K. Saket, S. Senthil Kumar, M. K. Das, S. Nekkanti, S. K. Gupta, K. Senthil, V. Nallasamy
Summary: A compact Marx generator with a voltage of 500 kV and repetition rate of 80 Hz was designed and developed for generating high-intense relativistic electron beams in high-power microwave sources. It consists of eight bipolar stages (16 stages of unipolar), utilizing energy storage capacitors for improved performance in repetition mode operation. The generator achieved a repetition rate of 80 Hz in pulse repetition frequency (PRF) mode, with a measured RF output power of 100 MW when tested with a vircator device.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Multidisciplinary
Pinshu Rui, Dongpeng Li, Zhenfa Zi, Yan Zhao
Summary: This study proposes a low-friction and high-performance triboelectric-electromagnetic hybrid nanogenerator for harvesting broadband rotation energy. The device can function as a self-powered active wind speed sensor, capable of detecting low wind speeds.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Optics
Dongwei Li, Wei Liang, Deming Li, Longfei Ji, Bingxin Yan, Junwei Chang, Tingting Xi, Lanzhi Zhang, Yangjian Cai, Zuoqiang Hao
Summary: This study presents a simple method for distinguishing the regimes of nonlinear propagation of femtosecond pulses in fused silica by evaluating the broadening of the laser spectrum as the input pulse power gradually increases. The critical powers for self-focusing and mature filamentation of both types of laser pulses are obtained.
Article
Chemistry, Physical
Kun Zhang, Ling Cai, Azadeh Nilghaz, Guangxue Chen, Xiaofang Wan, Junfei Tian
Summary: This study presents a promising strategy to improve the efficiency of atmospheric moisture catchers in the field of hygroelectric generator (HEG) engineering. The use of carbon black (CB) ink and copper electrodes allows for the generation of highly efficient HEGs with high output power. Additionally, the study investigates the impact of different electrodes on electricity generation, and demonstrates the potential of boosting the open-circuit voltage to drive commercial electronic devices in various weather conditions.
Article
Environmental Sciences
Rachel Lugassi, Alexandra Blank, Irina Rogozovsky, Kevin Ohneiser, Albert Ansmann, Yoav Linzon, Alexandra Chudnovsky
Summary: Implementing a mobile measurement device to accurately monitor complex pollution in the city is still a challenge. Current research proposes the use of UAV-based platforms for measurements, but questions remain regarding the representativeness of these measurements and the impact of UAVs on data quality. In this study, a UAV-based platform is developed and tested for measuring meteorological and air quality parameters, such as air temperature, relative humidity, and PM2.5. The researchers also investigate the effects of different instrumentation setups and propeller rotations on the measured parameters.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Environmental Sciences
Aviv Kaplan, Gefen Ronen-Eliraz, Stanislav Ratner, Yaron Aviv, Yitzhak Wolanov, Dror Avisar
Summary: The atmospheric water generator (AWG) is a commercially available device that produces large volumes of water from the air in a short time. It can be used in most regions of the world to address chronic and acute drinking water scarcity. However, the impact of air chemical composition on the quality of AWG-produced water is not well understood. In a survey conducted in a heavily polluted industrial environment, AWG-produced water was found to meet drinking water standards for most contaminants, except for specific parameters such as nickel, dichloromethane, and ammonia.
ENVIRONMENTAL POLLUTION
(2023)
Article
Physics, Multidisciplinary
V. T. Tikhonchuk, Y. Liu, R. Danylo, A. Houard, A. Mysyrowicz
Summary: The article proposes a model to explain delayed cavity-free forward lasing observed in nitrogen, involving ionization and excitation of nitrogen molecules followed by emission of excited ions. The model identifies two regimes of signal amplification and demonstrates good agreement with experimental results.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Rostyslav Danylo, Guillaume Lambert, Yi Liu, Vladimir Tikhonchuk, Aurelien Houard, Andre Mysyrowicz
Summary: By double excitation of nitrogen molecules with intense femtosecond laser pulses, the time profile of a lasing signal at 391.4 nm was measured, showing an abrupt decrease in emission at the arrival of the second pulse. This decrease is attributed to electron transfer from the ground state to the first excited ionic level and disruption of coherence.
Article
Optics
O. Kosareva, N. Panov, D. Shipilo, D. Mokrousova, I Nikolaeva, E. Mitina, A. Koribut, A. Reutov, G. Rizaev, A. Couairon, A. Houard, D. Skryabin, A. Saletskiy, A. Savel'ev, L. Seleznev, A. Ionin, S. L. Chin
Summary: The study revealed that pulses at 744 nm can generate filaments and high-intensity light channels during propagation, forming spectral humps up to 850 nm. Simulations showed that these spectral humps indicate the formation of a train of femtosecond pulses at predictable positions in the propagation path.
Article
Optics
V Jukna, S. Albert, C. Millon, B. Mahieu, R. Guillermin, G. Rabau, D. Fattaccioli, A. Mysyrowicz, A. Couairon, A. Houard
Summary: Experiments and simulations were conducted to investigate filamentation and generation of acoustic waves in water using loosely focused multi-millijoules laser pulses. The results showed a transition from filamentary propagation to localized breakdown when the laser pulse duration increased, indicating the significant role of Kerr self-focusing in the beam propagation dynamics. Furthermore, the shape, amplitude, and spectrum of the resulting pressure wave strongly depended on the laser pulse duration.
Article
Optics
U. Andral, P. Walch, V Moreno, B. Mahieu, T. Produit, M. Lozano, L. Bizet, C. Herkommer, M. Moret, Y-B Andre, P. Krotz, T. Metzger, K. Michel, A. Mysyrowicz, J. Kasparian, D. Lupinski, A. Houard, J-P Wolf
Summary: This paper reports the high energy conversion efficiencies of up to 59% for second harmonic generation (SHG) and 27% for third harmonic generation (THG) achieved by laser pulses with high peak power in the sub-TW range and average powers in the sub-kW range. No damage or efficiency decrease is observed after more than 100 hours of operation. The resulting high-energy visible and near-UV pulses are suitable for various applications.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Optics
Liang Xu, Qi Lu, Vladimir T. Tikhonchuk, Bin Zhou, Runzhe Yang, Qingqing Liang, Feng He, Rostyslav Danylo, Aurelien Houard, Andre Mysyrowicz, Yi Liu
Summary: This paper investigates the population distribution in N-2(+) under the excitation of pump laser using a quantum-mechanical time-domain incoherent superposition model and a quasi-classical model. The results show that the quasi-classical model underestimates the population inversions corresponding to certain optical transitions, and a fast and accurate correction is proposed. This work solidifies the theoretical models for population distribution in N-2(+) and paves the way for understanding its lasing mechanism.
Article
Optics
Silin Fu, Benoit Mahieu, Andre Mysyrowicz, Aurelien Houard
Summary: This study investigates the filamentation of optical vortices in air and compares them with the classical filamentation regime. It is found that optical vortices generate a more uniform heating effect along the propagation axis and the resulting low-density channel is less sensitive to the laser input power due to filamentation intensity clamping and phase vorticity.
Article
Chemistry, Analytical
Yuri E. Geints, Olga V. Minina, Ilia Yu. Geints, Leonid V. Seleznev, Dmitrii V. Pushkarev, Daria V. Mokrousova, Georgy E. Rizaev, Daniil E. Shipilo, Irina A. Nikolaeva, Maria V. Kurilova, Nikolay A. Panov, Olga G. Kosareva, Aurelien Houard, Arnaud Couairon, Andrey A. Ionin, Weiwei Liu
Summary: This study delays the appearance of the high-intensity region by inserting metal-wire meshes with different cell sizes and confirms the delay effect as the cell size decreases.
Article
Optics
Aurelien Houard, Pierre Walch, Thomas Produit, Victor Moreno, Benoit Mahieu, Antonio Sunjerga, Clemens Herkommer, Amirhossein Mostajabi, Ugo Andral, Yves-Bernard Andre, Magali Lozano, Laurent Bizet, Malte C. Schroeder, Guillaume Schimmel, Michel Moret, Mark Stanley, W. A. Rison, Oliver Maurice, Bruno Esmiller, Knut Michel, Walter Haas, Thomas Metzger, Marcos Rubinstein, Farhad Rachidi, Vernon Cooray, Andre Mysyrowicz, Jerome Kasparian, Jean-Pierre Wolf
Summary: This study demonstrates for the first time that laser-induced filaments can guide lightning discharges over considerable distances. Field trials on the Santis mountain in Switzerland recorded the guiding of a negative lightning leader for a distance of 50 m, and this phenomenon was confirmed by interferometric measurements. This breakthrough has significant implications for lightning protection and opens up new possibilities for atmospheric applications of ultrashort lasers.
Article
Optics
Qi Lu, Xiang Zhang, Santiago Lopez, Haicheng Mei, Liang Xu, Qingqing Liang, Aurelien Houard, Vladimir Tikhonchuk, Andre Mysyrowicz, Eduardo Oliva, Yi Liu
Summary: We report a spectral splitting effect in the cavity-less lasing emission of nitrogen ions at 391.4 nm when pumped by 800-nm femtosecond laser pulses. The R and P branches both experience spectral splitting with increased nitrogen gas pressure and pump pulse energy. Similar split spectral line is observed for the amplified emission with external injected seeding pulse, but no such phenomenon is observed for fluorescence radiation with more abundant R branch structures. Our theoretical model considers gas ionization, excitation competition, and amplification in the plasma to explain this spectral splitting effect.
Article
Physics, Applied
R. Danylo, X. Zhang, A. Lisova, A. Houard, Y. Liu, V. Tikhonchuk, A. Mysyrowicz
Summary: In this study, the lasing characteristics of N(2)(+) under 428nm pumping are investigated by varying the time delay between two 800nm ultrashort pumping pulses. It is observed that the laser emission is significantly reduced when the time delay is in the range of -20ps < dt < +20ps. From the analysis of the quenching results, it is concluded that the mechanism of lasing corresponds to a coherent two-photon amplification scheme, rather than the common population-inverted one-photon amplification mechanism.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Shixiang Wang, Chenhui Lu, Zhengquan Fan, Aurelien Houard, Vladimir Tikhonchuk, Andre Mysyrowicz, Songlin Zhuang, Vasily A. Kostin, Yi Liu
Summary: The study demonstrates coherent control of nitrogen molecules ionization by femtosecond laser, with phase shifts between three laser colors affecting ionization degree. The observations suggest competition between different parametric channels influencing the ionization process.
Article
Physics, Applied
P. Walch, B. Mahieu, L. Arantchouk, Y. -B. Andre, A. Mysyrowicz, A. Houard
Summary: The study shows that at high repetition rates, femtosecond lasers can create a permanent low-density channel in air, affecting the breakdown voltage between two electrodes, with the accumulation of O-2 ions being a contributing factor to the voltage reduction.
APPLIED PHYSICS LETTERS
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Jean-Pierre Wolf, Thomas Produit, Malte C. Schroder, Pierre Walch, Clemens Herkommer, Amirhossein Mostajabi, Michel Moret, Ugo Andral, Victor Moreno, Antonio Sunjerga, Mohammad Azadifar, Yves-Bernard Andre, Benoit Mahieu, Peter Krotz, Thomas Metzger, Knut Michel, Andre Mysyrowicz, Marcos Rubinstein, Farhad Rachidi, Jerome Kasparian, Aurelien Houard
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Optics
Vladimir T. Tikhonchuk, Yi Liu, Rostyslav Danylo, Aurelien Houard, Andre Mysyrowicz
Summary: The model presented describes ionization and excitation of nitrogen molecules by a strong and short laser pulse within the same formalism of the density matrix. The dependence of the dipole moment on the vibrational quantum number and a large number of excited levels are taken into account. Populations of the excited levels are significantly influenced by laser intensity, wavelength, polarization, and pulse duration.
