Fluorescence and optogalvanic signals in atomic yttrium from tunable diode laser excitation in a hollow cathode lamp

Fluorescence from neutral atomic yttrium is measured at the 2D°5/2 → 2D3/2 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 2D5/2 → 2D°5/2 transition. The atomic source is a hollow cathode lamp. A concurrent optogalvanic signal has also been measured.