Abstract
Fluorescence from neutral atomic yttrium is measured at the 2D° 5/2 → 2D 3/2 transition, corresponding to a wavelength of 622.26 nm. The upper level, 2D° 5/2, is excited using a diode laser operated in an extended cavity Littrow's configuration at 643.5 nm, corresponding to the 2D 5/2 → 2D° 5/2 transition. The atomic source is a hollow cathode lamp. A concurrent optogalvanic signal has also been measured.
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