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3 results on '"Patrick Chazette"'

1. Microsecond-pulse master oscillator – power amplifier at 828 nm for a water-vapor differential absorption lidar

Author

Gaëlle Lucas-Leclin, Sylvie Janicot, Jeremy Lagarrigue, Patrick Chazette, Qin Liu, Julien Totems, Laboratoire Charles Fabry / Lasers, Laboratoire Charles Fabry (LCF), Institut d'Optique Graduate School (IOGS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Chimie Atmosphérique Expérimentale (CAE), and Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, Amplifier, Pulse (physics), Master oscillator, Microsecond, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Differential absorption lidar, Optoelectronics, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, business, Water vapor
Abstract

Poster; International audience; We describe the design and characterization of a master oscillator – power amplifier laser system operating under µs-pulse regime at 828 nm, with a view to its integration in an airborne lidar for tropospheric water-vapor measurements. The output energy reaches 6.2 µJ per pulse.

Published
2021
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3. Use of ERS/SAR measurements for soil geometric and aerodynamic roughness estimation in semi-arid and arid areas

Author

M. Kardous, Mehrez Zribi, Patrick Chazette, Yann Callot, Gilles Bergametti, Jean-Louis Rajot, S. Le Hégarat-Mascle, and Béatrice Marticorena

Subjects
Synthetic aperture radar, Ground truth, Backscatter, law, Radar imaging, Surface roughness, Soil science, Surface finish, Radar, Arid, Geology, law.invention, Remote sensing
Abstract

This paper discusses the potential of radar signal to characterise the bare surface roughness in arid or semi-arid regions. The used microwave sensor is the SAR of ERS. Ground truth measurements were acquired over different arid sites in the South of Tunisia. An empirical approach is proposed to derive the surface roughness from SAR measurements. The relationships with two different kinds of roughness have been studied: the geometric roughness, which is characterised by a rather new parameter called Zs, and the classical aerodynamic roughness Z/sub 0/.

Published
2004
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