Abstract
Four-wave mixing (FWM) in gaseous media has successfully been employed for the generation of intense tunable coherent vacuum ultraviolet radiation below ~200 nm.1) Although rare gases are the most convenient nonlinear materials, in the extreme ultraviolet (XUV) spectral region less than about 100 nm, only a few experiments2,3) have so far been reported using two-photon resonances which greatly enhance the nonlinear susceptibilities and resulting conversion efficiency. Here we report the generation of tunable coherent XUV radiation by two-photon resonant FWM in Kr and Xe, where the recently-developed new nonlinear crystal β-BaB2C4 (BBO)4-6) has been used to produce the fundamental deep UV radiation required for the two-photon resonances.
© 1988 Optical Society of America
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