  Continuous-wave coherent radiation in the vacuum ultraviolet (VUV)wavelength
region at 121 nm will be essential for future laser-cooling of trapped
antihydrogen [1]. Cold antihydrogen will enable both tests of the fundamental
symmetry between matter and antimatter at unprecedented experimental precision
[2] and also experiments in antimatter gravity [3]. Another fascinating
application of narrowband continuous laser radiation in the VUV is quantum
information processing using single trapped ions in Rydberg-states [4, 5]. Here
we describe highly efficient continuous four-wave mixing in the VUV by using
three different fundamental wavelengths with a sophisticated choice of
detunings to resonances of the nonlinear medium. Up to 6 microwatts of vacuum
ultraviolet radiation at 121 nm can be generated which corresponds to an
increase of three orders of magnitude in efficiency.
