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Reference : UMR8023-ANGVAS-006
Workplace : PARIS 05
Date of publication : Wednesday, June 9, 2021
Scientific Responsible name : Angela Vasanelli
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The mid-infrared spectral region (2-20μm) contains the characteristic vibrational transitions of important atmospheric gases (H2O, N2O, CO2, NF3, CH4, O3…). Moreover, in this range there are two atmospheric transparency windows at 3-5µm and 8-13µm and therefore a light beam can propagate over very long distances and investigate the atmosphere remotely. Furthermore, mid-infrared radiation has a lower sensitivity to atmospheric turbulence than at telecoms wavelengths. This is crucial to have an accurate, precise and very sensitive measurements for environmental sensing, spectrometry and greenhouse gases (GHG) monitoring.
The objective of this PhD thesis, funded by an ANR project, is the realization of a frequency modulation LIDAR (FMCW). This system will be based on 9µm quantum cascade lasers and on room temperature quantum well detectors developed at LPENS. The principle of the experiment is the heterodyne coherent detection of the signal reflected by a moving target. Quantum cascade lasers are well suited for this system because they operate in continuous wave and can be stabilized in frequency and amplitude.
The PhD candidate will have the opportunity to work in a scientific environment of research excellence in the heart of Paris, with top class facilities and collaborations with top scientific and industrial institutions in the field of MIR optoelectronics.
The PhD work will take place at the physics laboratory of the Ecole Normale Supérieure in the Quantum physics and devices group (QUAD), in collaboration with several academic and industrial partners.
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