Showing papers by "Jérôme Bourderionnet published in 2006"
28 Sep 2006
TL;DR: It is shown that a multispectral polarimetric image brings additional information on the scene, especially when interpreted in conjunction with its counterpart intensity image, since these two images are complementary in most cases.
Abstract: A compact laboratory demonstrator providing both active polarimetric and multispectral images is designed. Its
buildings blocks include, at emission part, a multi-wavelength optical parametric oscillator and, at the reception part, a
polarimetric hyperspectral imager. Some of the results obtained with this system are illustrated and discussed. In
particular, we show that a multispectral polarimetric image brings additional information on the scene, especially when
interpreted in conjunction with its counterpart intensity image, since these two images are complementary in most cases.
Moreover, although hyperspectral imaging might be mandatory for recognition of small targets, we evidence that the
number of channels can be limited to a set of few wavelengths as far as target detection is considered.
14 citations
Patent•
20 Oct 2006
TL;DR: In this paper, a polarimetric imaging system having an optical axis and comprising means of detection and analysis of the light backscattered by an object illuminated by a light source and at least one blade programmable wave was described.
Abstract: The invention relates to a polarimetric imaging system having an optical axis and comprising means of detection and analysis (35) of the light backscattered by an object illuminated by a light source and at least one blade programmable wave (33) characterized in that the programmable waveplate comprises a material with an isotropic electro-optic tensor and a set of at least three electrodes arranged in directions parallel to the optical axis of the system imaging.
TL;DR: In this article, an acousto-optic modulator is used to enhance the refresh rate and dynamic properties of a liquid-crystal spatial light modulator (SLM), where the useful area of the SLM surface is split in several zones which are addressed separately, and read in a sequence by a steered laser beam.
Abstract: We demonstrate the use of an acousto-optic modulator to enhance the refresh rate and dynamic properties of a liquid-crystal spatial light modulator (SLM). The useful area of the SLM surface is split in several zones which are addressed separately, and read in a sequence by a steered laser beam. This configuration allows to increase the refresh rate by five orders of magnitude. Furthermore, improvements on the nature of the transition between different holograms are experimentally shown. The advantages of this technique are discussed in the particular context of cold atom manipulation with holographic optical tweezers.