title: One and two-photon excited optogalvanic spectra of argon in the wavelength region of 735-850 nm.
abstract: Optogalvanic (OG) spectra of argon in the visible to near-infrared spectral region between 735 and 850 nm were investigated using a Grimm-style glow-discharge tube, which has been widely used to obtain depth profiles of the elemental composition on various film-like samples. About 49 lines of one-photon and two-photon OG peaks were observed with a pulsed Ti:sapphire laser; these peaks were precisely assigned. Two-photon OG spectra of argon were easily observed without focusing the pulsed laser irradiation to more than 1 mJ. The excitation mechanisms of the observed argon OG spectra could be classified into 3 types: single-photon transition, two-photon transition, and two-photon stepwise transition. In addition, a pseudo-resonant effect was also found to be effective. The argon lines observed in this experiment are suitable as convenient calibration wavelength markers of pulsed tunable laser radiation.
authors.affiliation: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan. matsuta@imr.tohoku.ac.jp
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Matsuta
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Wagatsuma
authors.forename: Kuniyuki
authors.initials: K
authors.lastname: Kitagawa