Optical-Cycle Physics (PCO)
The PCO group was created in 2005 on the impetus given by Excellence Chair grant of Gérard Mourou, director of the LOA at the time and in 2018 laureate of the Nobel Prize in Physics. We study the interaction of a very intense laser with matter with the objective to follow and control the collective movement of relativistic electrons (with a velocity close to the speed of light) on a time scale below an oscillation cycle of our laser light – which is what gives our group its name. This time scale is measured in attoseconds, i.e. billionths of a billionth of a second = 10-18 s.
Therefore, we develop laser technologies which we unite in the « Salle Noire » : a laser producing a thousand pulses per second, each of which contains barely more than a single light wave oscillation cycle. In technical terms, this is a laser with a central wavelength of 720 nm (optical cycle is 2.6 fs long) and a minimal pulse duration of 3.5 fs, with a stable carrier-envelope phase and a repetition rate of 1 kHz. Its peak power of a terawatt (1012 W) and its extremely high temporal contrast make it a worldwide unique laser of its kind.
This laser performance lets us create –in a finely controlled fashion— extreme conditions in plasmas, uniting gigantic forces that accelerate electrons quasi-instantaneously to relativistic velocities. We are particularly interested in dense plasmas created at the surface of solid targets, which behave as relativistic oscillating mirrors in such a way as to temporally compress the oscillations of the reflected light.
This temporal compression adds to the laser light new frequencies in the extreme-ultraviolet (XUV) range, and does so in the form of attosecond flashes. These flashes are of great interest for observing the extremely fast movement of electrons in atoms, molecules or solids, during a chemical reaction or a transition between quantum states.
Another perspective is opened when the attosecond pulses carry a large part of generating laser energy, thus further boosting the peak power. As moreover XUV light can be focused to much smaller sizes than visible light, it may thus become possible to reach new record light intensities and enter a regime where photons interact among each other, or even with the vacuum. The research done within the PCO group contributes to explore also this domain, which bears potential for major new discoveries.
Dr. Zhao Cheng (IR2 CNRS)
Dr. Louis Daniault (IR 2 Polytechnique) Google Scholar
MSc Marie Ouillé (PhD student, CIFRE with Ardop Engineering)
MSc Jaismeen Kaur (CDD ingénieur)
Antoine Cavagna (CDD ingénieur)
Aurélie Jullien (CR CNRS 2008–2015, now at Institut de Physique de Nice)
Olivier Albert (Prof. ENSTA 2008—2014, now at Fastlite)
Anthony Guillaume (Master 2019, now IT developper)
Jean-Baptiste Margoto (Thèse 2016—2019, engineer at ITEOX)
Frederik Böhle (Master et Thèse 2013—2017, engineer at Menlo Systems)
Maïnmouna Bocoum (Thèse 2013—2016, CNRS researcher at Institut Langevin)
Hermance Jacqmin (Thèse 2013—2016, engineer at Onera)
Antonin Borot (PhD 2010—2013, co-founder of SourceLab, CEA researcher, now at Unistellar Optics)
Aurélien Ricci (PhD 2010—2013, co-founder of SourceLab and founder of Décor World Services)
Arnaud Malvache (PhD 2008—2011, CNRS researcher, co-founder of Unistellar Optics)
Lorenzo Canova (PhD 2007—2010, now at Saint Gobain)
Jonathan Wheeler (Postdoc 2010-2011, now researcher at IZEST)
Xiaowei Chen (Postdoc 2008-2010, now at Amplitude Technologies)
Brigitte Mercier (IR1 CNRS, 2009-2020, retired)
Jean-Philippe Rousseau (IR1 Polytechnique, 2009-2020, retired)
Natalia Naumova (IR2 Polytechnique, 2004-2019)