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We find that stimulated Raman excitation of an atom by a two-photon pulse can be enhanced by orders of magnitude if the photons are simultaneously frequency correlated and spatially anti-correlated. That is correlated photon pair must have an inherent time delay between its constituent photons.

A fiber-based robust, design-flexible FD-OCM technique using a Bessel-like LP02 mode is demonstrated. Extended DOF compared to Gaussian illumination of equal spot-size at focus is reported. We characterize the resolution performance of this system.

A classical ghost imaging experiment performed at the free-electron laser FLASH is presented. The possibility of image formation, a double bar in our case, in the beam that has never interacted with the sample is demonstrated.

We demonstrate that by using squeezed light for two-photon absorption (TPA) of fluorescein biomarkers, a fluorescence enhancement of nearly 50 is achieved as compared to conventional TPA using coherent light.

Combining structured illumination with the evaluation of intensity auto-correlations enhances superresolution microscopy, both in widefield and confocal. We show how plasmonic illumination boosts the performance creating a huge, gapless OTF support.