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Random projections have proven extremely useful in many signal processing and machine learning applications. However, they often require either to store a very large random matrix, or to use a different, structured matrix to reduce the computational and memory costs. Here, we overcome this difficulty by proposing an analog, optical device, that performs the random projections literally at the speed...
We demonstrate how to measure accurately the transmission matrix of a complex medium. With this information, we show how to focus light, recover an image, and even perform efficient reconstruction of a sparse object.
We present an innovative mirrorless optofluidic random laser where the optical cavity has been replaced by a random scattering structure. We achieve emission control at any desired wavelength by iteratively shaping the optical pump profile.
We report on the optical measurement of the backscattering matrix in a weakly scattering medium. A decomposition of the time reversal operator allows selective and efficient focusing on individual scatterers, even through an aberrating layer.
We developed a technique to measure the temporal spread of a femtosecond optical pulse through a scattering medium, by means of speckle contrast. This technique is relevant for spatiotemporal control in complex media experiments.
Recently, a method has been proposed by I. Vellekoop et al. [1] to focus light through a multiple scattering material, using a spatial light modulator as a tool to shape the incoming beam to obtain a maximal interference on a speckle spot of the output speckle pattern. The result is a bright, diffraction limited, spot which can be several hundred times brighter than the rest of the speckle.
We introduce a method to measure the transmission matrix of a complex medium. This matrix exhibits statistical properties in good agreement with random matrix theory and allows light focusing and imaging through the random medium.
This article presents tools needed to reveal optical contrasts at very different scales ranging from a centimetres to nanometres. Acouto-optic imaging, photoacoustic imaging and optical coherence tomography are presented as modalities exploiting the coherence characteristics of light for optical contrast imaging.
In this paper we propose an experimental scheme to create and probe optomechanical entanglement between a light field and a mechanical oscillator. This is achieved using a bright laser field that resonates inside a cavity and couples to the position and momentum of a moving (micro)mirror.
We realize image amplification in the continuous wave regime within an optical parametric oscillator bellow threshold. We show that its noise figure is better than that of a classical amplifier, demonstrating its quantum multimode operation.
Optical images can be used to transport, store and process information in a parallel way. We discuss different results obtained in the domain of 'quantum imaging', aiming at exploiting at the same time the quantum properties of optical images and their intrinsic parallelism. We define the notion of standard quantum limit (SQL) in optical resolution, set by the quantum noise of usual coherent light,...
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