Abstract
We report the production of stable CW single mode UV radiation around 295 nm at powers exceeding 50 mW, using a passive enhancement cavity for second harmonic generation. With this laser we have investigated the 2 3S−5 3P transition at 294.5 nm in 3He and 4He by intermodulated fluorescence spectroscopy. The measurements of the hyperfine splittings of the 5 3P levels agree with semi-empirical calculations.
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