Offres de stages et d'emploi
2024-2026
THEMATIQUE: UV Dual Comb spectroscopy for atmospheric remote-sensing
Post-Doctoral position (2 years )
ATMOS research group
Offer details and how to apply
2022/ 2023
THEMATIQUE: High-resolution molecular spectroscopy
Post-Doctoral position ( 1,5 years )
ATMOS research group
The research activity will mainly focus on the fundamental optics in high resolution molecular spectroscopy currently performed in the team. The focus will be on the frequency comb laser source and on high finesse optical cavities. This research will be carried out in cooperation with the LMA (Advanced Materials Laboratory). This institute is involved in an international project dedicated to the development of high reflectivity mirrors used for the detection of gravitational waves.
The candidate will be involved in the development of an ongoing experiment dedicated to the quantitative characterization of the extremely high reflectivity of these mirrors. The cavity ring down and the frequency comb methodologies [1] will be coupled to allow high accuracy measurements.
He/she will also be involved in other molecular spectroscopy projects carried out by the ATMOS team.
The candidate should have a PhD in physics. It is expected that the candidate will have skills among optical spectroscopy, laser, optical cavities, frequency comb, fast optical signal acquisition.
The duration of the contract is 1 ½ years, full time, starting end of 2022.
Salary: from 2000 € net/month, depending on research experience. The employer will be the University Claude Bernard Lyon 1, and the position will be based in the ILM premises (address below).
For more information and contact:
Jérôme Morville -
Patrick Rairoux –
[1] "Cavity-Enhanced Frequency Comb Vernier Spectroscopy" Lu, Chuang, Jerome Morville, Lucile Rutkowski, Francisco Senna Vieira, and Aleksandra Foltynowicz. 2022. Photonics9, no. 4: 222. https://doi.org/10.3390/photonics9040222
2022
THEMATIQUE: Aérosols atmosphériques (phase solide, phase liquide)
Post-Doctoral position, A unique laboratory polarimeter to address atmospheric particles spectroscopy
Alain Miffre (
Scientific context and motivations: Atmospheric particles are complex physical objects presenting a wide range of sizes, a highly irregular shape and a variety of chemical compositions, which prevent from quantifying their impact on the Earth’s climate (IPCC, 2021). Indeed, for such complex-shaped particles, no analytical solution to the Maxwell’s equations exists. To quantify the interaction of such complex systems with the electromagnetic field, as is required for addressing climate issues, light scattering numerical simulations have then been exploited. However, these numerical models rely on simplying assumptions, which should be carefully checked and for that laboratory measurements are coveted. In this context, of prime importance is the physical process of light backscattering from a fundamental point of view but also from an applicative point of view, as future lidar satellite missions (Earth Care, ACCP) will be based on this physical process, as underscored by CNES in France. The atmosphere being a complex system, light backscattering should indeed be first studied in laboratory, as a preliminary stage toward precise lidar retrievals. However, it is only recently that light backscattering has been for the first time observed in a controlled-laboratory experiment for an ensemble of particles embedded in ambient air (Miffre et al., 2016). For the first time to our knowledge, a laboratory polarimeter has hence been designed and operated to quantify light backscattering by atmospheric particles (Miffre et al., 2016, 2019). This Pi-polarimeter allows quantifying the spectral behavior of atmospheric particles, opening new insights for interpreting lidar signals.
Work plan: The present call is centered on the spectral properties of atmospheric particles. Indeed, no aerosol spectroscopic database exists as is the case with the HITRAN database for molecules. This work is aimed at contributing to fill this gap by extending our unique laboratory approach to the IR spectral range, which is key for aerosol identification (Burton et al., 2016). More precisely, fundamental laboratory intensive work is required to develop the Pi-polarimeter in the IR spectral range and unambiguously retrieve the spectral and polarimetric behavior of studied aerosol particles. Such unique laboratory measurements will then be made available to a broad scientific community, in France and abroad through publications and conferences.
Candidate profile : To carry out this research project, candidates must hold a PhD in spectroscopy or / and polarimetry. Complementary skills in atmospheric physics will be appreciated but are not essential. This 12 months’ position will be located at the Institute of Light and Matter (iLM) under the supervision of A. Miffre from the ATMOS research group. Candidates are encouraged to use the below contact information for discussing in detail if this post-doctoral position may be interesting for them.
Contact information : Alain Miffre, Associate Professor in Physics at iLM, Atmos Research group at ILM (Prof. Rairoux’s group),
References
Burton, S. et al., Atmos. Chem. Phys., 15, 13453-13473, (2016).
IPCC, Intergovernmental Panel for Climate Change: the Physical Science Basis. (2013).
Mishchenko, M. I. et al.: Scattering, Absorption, and Emission of Light by Small Particles, (2002).
Miffre, A., T. Mehri, M. Francis and P. Rairoux, UV-VIS depolarization from Arizona Test Dust particles at exact backscattering angle, J. Quant. Spec. Rad. Transf., 169, 45-59, (2016).
PhD position, in parternship with CNES, Mineral dust lidar depolarization from laboratory to field experiments
ATMOS research group
Alain Miffre (