PHUNG , Duy-Hà

Beyond its use in geophysics or in large scale metrology, laser-based measurement of long distances is expected to find numerous applications in space missions. Synthetic aperture instruments in formation flight require that the constellation geometry be known and controlled to much better than the wavelength of the observation window. To meet...

DFB diode lasers have linewidths in the MHz range. Narrowing the linewidth can be obtained by locking the diode to a frequency discriminator (Michelson interferometer,...). But the lock bandwidth has to reach 10 MHz or higher.The current-to-frequency transfer function of DFB lasers is complex: thermal effects at low frequency, carrier physics...

In this paper, we propose a model reproducing the sequences of flashes emitted by the Ajisai satellite by reflection of the sunlight on the mirrors all around its surface and received by an observing station. A decisive novelty was added by introducing the curvature of the mirrors, that allows the reconstruction of the observed light curve...

In this paper, we propose a model reproducing the sequences of flashes emitted by the Ajisai satellite by reflection of the sunlight on the mirrors all around its surface and received by an observing station. A decisive novelty was added by introducing the curvature of the mirrors, that allows the reconstruction of the observed light curve...

Based on a fully passive space segment, the lunar laser ranging experiment is the last of the Apollo Lunar Surface Experiments Package to operate. Observations from the Grasse lunar laser ranging station have been made on a daily basis since the first echoes obtained in 1981. In this paper, first, we review the principle and the technical...

Based on a fully passive space segment, the Lunar Laser Ranging experiment is the last of the Apollo Lunar Surface Experiments Package to operate. Observations from Grasse Lunar Laser Ranging station have been realized on a daily basis since the first echoes obtained in 1981. We will give a brief summary of the progress made at Grasse Laser...

Based on a fully passive space segment, the lunar laser ranging experiment is the last of the Apollo Lunar Surface Experiments Package to operate. Observations from the Grasse lunar laser ranging station have been made on a daily basis since the first echoes obtained in 1981. In this paper, first, we review the principle and the technical...