Active coherent beam combining and beam steering using a spatial mode multiplexer

Coherent beam combination is one promising way to overcome the power limit of one single laser. In this paper, we use a Multi-Plane Light Converter to combine 12 fibers at 1.03 micron with a phase locking setup. The overall loss measurement gives a combination efficiency in the fundamental Hermite-Gaussian mode as high as 70%. This setup can generate the fundamental and higher-order Hermite-Gaussian modes and has beam steering capabilities

Fourier transform: A tool to measure statistical level properties in very complex spectra

International audienceWe show that the Fourier transform of very complex spectra gives a sound measurement of long-range statistical properties of levels even in cases of badly resolved, poorly correlated spectra. Examples of nuclear energy levels, highly excited acetylene vibrational levels, and singlet-triplet anticrossing spectra in methylglyoxal are displayed

Photonic integrated circuit based FMCW coherent LiDAR

We present the demonstration of an integrated Frequency Modulated Continuous Wave LiDAR on a silicon platform. The waveform calibration, the scanning system and the balanced detectors are implemented on chip. Detection and ranging of a moving hard target at up to 60 m with less than 5 mW of output power is demonstrated here

Imagerie polarimétrique active adaptative dans l’infrarouge (Orale)

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Active polarimetric imager with near infrared laser illumination for adaptive contrast optimization

International audienceWe designed and built an active polarimetric imager with laser illumination at 1.5 μm wavelength for adaptive polarimetric contrast optimization. It can generate and analyze any polarization state on the Poincaré sphere in order to best adapt to the polarimetric properties of the scene. Polarimetric contrast optimization is performed by analyzing the scene with an ultrafast active-contour-based segmentation algorithm. This device is, to the best of our knowledge, the first fully adaptive imager controlled by image processing algorithms for polarimetric contrast enhancement. Its capabilities are illustrated in some examples of real-world decamouflage applications

Infrared active polarimetric imaging system controlled by image segmentation algorithms: application to decamouflage (Orale)

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Comparison of different active polarimetric imaging modes for target detection in outdoor environment

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