Spatiotemporal Coherent Control of Light through a Multiple Scattering Medium with the Multispectral Transmission Matrix

We report the broadband characterization of the propagation of light through a multiple scattering medium by means of its multispectral transmission matrix. Using a single spatial light modulator, our approach enables the full control of both the spatial and spectral properties of an ultrashort pulse transmitted through the medium. We demonstrate spatiotemporal focusing of the pulse at any arbitrary position and time with any desired spectral shape. Our approach opens new perspectives for fundamental studies of light-matter interaction in disordered media, and has potential applications in sensing, coherent control, and imaging

Investigation of tur bulence in magnetized tor oidal plasma by cor r elative enhanced scatter ing diagnostics

The microwave enhanced scattering (ES) schemes in various modifications were developed and tested for investigation of turbulence and transport in magnetized laboratory plasma and tokamaks. The efficiency of ES methods to study internal small-scale fluctuations or waves in nonuniform magnetized plasma was confirmed experimentally for wide spectra of plasma parameters Exper imental r esults The experiments have been performed in ToriX toroidal plasma device (major radius R 0 = 0.61 m, minor radius a = 0.1 m). A plasma with typical parameters (n e = 5 × 10 10 cm -3 , T e = 1.5 3 eV) and nonuniform distributions of density and electron temperature was created by a hot filament discharge at argon pressure 7.5 × 10 -4 Torr and magnetic field ~ 0.3 T. Radial distribution of electron temperature obtained by Langmuir probe measurements is shown i