Wu Guang, Li Wenxue, Wu E, Zeng Heping
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, P.R. China.
Opt Express. 2010 Jan 18;18(2):1000-10. doi: 10.1364/OE.18.001000.
We demonstrate concurrent frequency up-conversion and down-conversion in a quadratic nonlinear medium for the generation of correlated ultraviolet and visible rainbows with one-to-one angular and spectral correspondence, facilitating generation of continuously tunable and photon-momentum-dependent multi-wavelength UV and visible twin photons.
