Bergeson, S; Baldwin, Kenneth; Lucatorto, T; McIlrath, T; Cheng, C; Eyler, Edward
We describe techniques for laser spectroscopy in the vacuum-UV (VUV) spectral region that combine high spectral resolution with high absolute accuracy, A nearly transform-limited nanosecond laser source at 120 nm is constructed with difference-frequency mixing. This source is used to perform the first, to our knowledge, Doppler-free VUV measurement. We measure the inherently narrow I1S-21S two-photon transition in atomic helium with a spectral resolution of 7 parts in 108 (180 MHz), the...[Show more]
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