Seventeen two-photon transitions for neon have been observed in the 580-
635 nm spectral region for use in the spectroscopic study of its higher excited
levels, which are not accessible by one-photon absorption. To compare the two
and one-photon absorption signals originating from the same lower level, an
effort was made to record single-photon optogalvanic spectrum in the available
wavelength region. The dependence of optogalvanic signals on the laser power
has also been studied. The optogalvanic signals were obtained from a commercial
neon-filled, hollow-cathode lamp, which was irradiated with pulsed dye
laser pumped with N laser