Abstract

Atomic vapours are a versatile tool for studying a wide range of nonlinear phenomena. In particular, quasi-resonant atomic systems allow processes such as electromagnetically induced transparency, fast and slow light, lasing without inversion and four wave mixing (FWM) to be studied at low light intensities. The resonant enhancement of FWM in a rubidium vapour is such that it can be used for efficient frequency up-conversion of near-infrared light (780 and 776 nm) to blue light (420 nm) [1–4].

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