A5083440459- Space Satellite Systems and Control
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Astro and Planetary Science
- Laser-Plasma Interactions and Diagnostics
- High-Temperature Coating Behaviors
- Laser Material Processing Techniques
- Ocular and Laser Science Research
- Planetary Science and Exploration
- Laser Design and Applications
- High Entropy Alloys Studies
- Spacecraft Design and Technology
- Atomic and Molecular Physics
- Quantum optics and atomic interactions
- Space exploration and regulation
- Satellite Communication Systems
- Lightning and Electromagnetic Phenomena
- Adaptive optics and wavefront sensing
- Ion-surface interactions and analysis
- Optical Wireless Communication Technologies
ArianeGroup (France)
2023
Arianespace (France)
2020-2023
Airbus (France)
2014-2017
Safran (France)
2017
Abstract Lightning discharges between charged clouds and the Earth’s surface are responsible for considerable damages casualties. It is therefore important to develop better protection methods in addition traditional Franklin rod. Here we present first demonstration that laser-induced filaments—formed sky by short intense laser pulses—can guide lightning over distances. We believe this experimental breakthrough will lead progress physics. An campaign was conducted on Säntis mountain...
Studies show that the number of debris in low Earth orbit is exponentially growing despite future release mitigation measures considered. Specifically, already existing population small and medium (between 1 cm several dozens cm) today a concrete threat to operational satellites. A ground-based laser solution which can remove, at expense nondestructive way, hazardous around selected space assets appears as highly promising answer. This studied within framework CLEANSPACE project part FP7...
In the perspective of laser lightning rod, ability femtosecond filaments to trigger and guide large scale discharges has been studied for several years. The present paper reports recent experimental results showing first time that are able not only but also divert an electric discharge from its normal path. Laser spark without contact between electrodes at distance laser. A comparison negative positive polarities reveals important discrepancies in guiding mechanism.
Lightning is highly destructive due to its high power density and unpredictable character. Directing lightning away would allow protect sensitive sites from direct indirect impacts (electromagnetic perturbations). Up now, lasers have been unable guide efficiently since they were not offering simultaneously terawatt peak powers kHz repetition rates. In the framework of Laser Rod project, we develop a laser system for control, with J-range pulses 1 ps duration at kHz. The project aims...
Studies show that the number of debris in Low Earth Orbit is exponentially growing despite future release mitigation measures considered. Especially, already existing population small and medium (between 1 cm several dozens cm) today a concrete threat to operational satellites. A ground based laser solution which can remove at low expense non‐destructive way hazardous decimetric size around selected space assets appears as one highly promising answer. This will be studied frame CLEANSPACE...
The satellite market is shifting towards smaller (micro and nanosatellites), lowered mass increased performance platforms. Nanosatellites picosatellites have been used for a number of new, innovative unique payloads missions. This trend requires new concepts reduced size, better performance/weight ratio reduction onboard power consumption. In this context, disruptive technologies, such as laser-optical communication systems, are opening possibilities. paper presents the C3PO<sup>1</sup>...
Improving orbital accuracy of space debris is one the major prerequisite to performing reliable collision prediction in low earth orbit. The objective avoid false alarms and useless maneuvers for operational satellites. This paper shows how laser ranging on can improve orbit determination. In March 2012 a joint OCA-Astrium team had first echoes from using MéO (Métrologie Optique) telescope Observatoire de la Côte d'Azur (OCA), upgraded with nanosecond pulsed laser. experiment was conducted...
Electric currents circulating between charged clouds and the earth surface during lightning discharges are responsible for considerable damages casualties. It is therefore important to develop better protection methods in addition traditional Franklin rod. Here we present first demonstration that filaments formed by short intense laser pulses can guide over distances. We believe this experimental breakthrough will lead progress physics. An campaign was carried out on Säntis Mountain...
Controlling lightning is a long-time dream of mankind. Along with the rapid evolution laser technologies, idea to develop protection based on filamentation high-power ultrashort-pulse lasers emerged in 1990s [1]. The goal Laser Lightning Rod (LLR) project that started 2017 was investigate new type use upward discharges initiated through high-repetition-rate terawatt [2]. To end, developed by Trumpf scientific pulse energy Joule-range, 1 ps duration, and repetition rate kHz [3]. This CPA...
Emission spectroscopy studyworks permitted us to characterize plasma produced by a Q- switched neodymium-glass laser on space and time scale (1.054 micrometers , 27 ns,), for incident power densities ranging between 2 10<SUP>8</SUP> 6 10<SUP>9</SUP> W/cm<SUP>2</SUP>, solid targets (aluminum, graphite, SiC) under vacuum (ambient pressures of the order 10<SUP>-3</SUP> Pa). For these experimental conditions electronic temperature is few eV density around 10<SUP>17</SUP> cm<SUP>-3</SUP>.
Cet article présente les travaux de reformation surface par laser puisé (laser excimère ou à vapeur cuivre) matériaux métalliques (alliages d'aluminium : AS7 et A12024, aciers inoxydables Marval X12 Z10CNT18.il,fonte lamellaire sphéroïdale), couramment utilisés dans industries aéronautiques automobiles, en vue d'améliorer certaines propriétés (résistance la corrosion, résistance l'usure au frottement).
This paper concerns investigations conducted by AEROSPATIALE (Louis-Blériot Joint Research Center) on UV radiation-matter interaction and the potential industrial applications like laser paint stripping, machining of special materials (ceramics, composites,) surface annealing metals.