Abstract
In this contribution we discuss recent work that has demonstrated that electromagnetically induced transparency (EIT) can greatly increase the intensity of coherent vacuum ultra-violet (VUV) radiation (at wavelengths shorter than 130nm) generated in resonant four-wave mixing schemes. We will start by introducing the basic concept of EIT enhanced resonant four-wave mixing, comparing it briefly with other coherently enhanced non-linear frequency up-conversion schemes. Experiments proving this concept in atomic hydrogen in the mid-1990’s will be summarised. Our own recent work on EIT enhanced four-wave mixing in Kr will be presented and recent results demonstrating high conversion efficiencies into the VUV, and the limits placed on this process at high density-length products, will be discussed.
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