Holographic laser-driven light sources for computational imaging

Femtosecond-laser-driven light sources on a water film have been applied for computational broadband imaging. The spatially selective generated light sources on a water film form a structured illumination pattern with a broadband wavelength including visible and non-visible region. The spatial position of the light source was controlled by beam deflection using a galvanometer scanner or phase modulation with computer-generated holograms displayed on a liquid crystal on silicon spatial light modulator. The light source excited on a water film can produce a broad emission spectrum that includes x-rays and terahertz waves in addition to the visible region. We have demonstrated x-ray and visible imaging by using the femtosecond-laser-driven light sources which was two-dimensionally generated on a water film. Furthermore, the imaging time was reduced while maintaining the number of pixels in the reconstructed image by using compressed sensing algorithms and coded illumination patterns.