Spatial, Spectral and Temporal Light Control in Disordered Multimode Fiber by Spatial Phase Modulation

Methods for simultaneously controlling the spatial, spectral, and temporal properties of ultrashort pulses after propagation through a disordered multimode fiber are presented. By leveraging the dispersion and strong mode-mixing within a disordered fiber, multidimensional control over the output pulse is achieved by tailoring only the spatial wavefront of the input pulse. The ability to generate reconfigurable spatiotemporal foci at single or multiple points in space and time is demonstrated experimentally. The control is extended to the spectral domain, as demonstrated by successful creation of spectrally-dependent foci, with different wavelength bands focused to distinct spatial locations and times. An approach for time-averaged wavefront shaping is also introduced, and is shown to enable the creation of complex spatial intensity patterns with tailored properties.