Efficient gas-phase VUV frequency up-conversion

摘要

We describe a pulsed, atomic lead (Pb) vapor-based vacuumnultraviolet (VUV) frequency converter from 233 to 186 nm with near-unitynphoton conversion efficiency. This conversion is attained withoutnphasematching and is accomplished by using electromagnetically inducedntransparency to drive a Raman transition to near-maximal coherencenwithout loss or beam blow-up. Under these conditions, the linear andnnonlinear polarizations of the generated 186-nm field are of the samenorder and complete conversion from the 233-nm field occurs within ansingle (nonphasematched) coherence length