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We study nondegenerate-wavelength thermal ghost imaging and found that the spatial resolution of the ghost image depends strongly on the wavelength of the light illuminating the object but not on that in the reference arm.
We demonstrate storage of images carried by optical pulses in hot vapors using a combination of FWM and EIT and show that the images retrieved are robust to diffusion.
We theoretically study possibilities of creating spatial patterns having subwavelength length by using so-called dark states. These dark states are formed via interaction with bichromatic optical fields. Performing experiments in Rb vapor, we experimentally demonstrated spatial patterns that are smaller than the length determined by the diffraction limit of optical system used in the experiment. This...
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