Stimulated Emission from the A¹Σ⁺uBand of Sodium Dimer

This is the authors' abstract. We don't add key points for this paper.

Intense stimulated emission from sodium vapor is observed at around 800 nm when it is pumped by a pulsed dye laser around 600 nm. The spectral lines are localized around 800 nm. To investigate the origin of this emission, we try to assign the stimulated lines excited by a dye laser at 632.8 nm (the wavelength of the He-Ne laser) and by a ruby laser at 694.3 nm. Moreover, the A Σ -X Σ transitions at 595.728 and 594.664 nm of a Na 2 which are newly assigned by using the polarization labelling spectroscopy are excited by the output from a cw-dye-laser amplified with N 2 laser-pumped dye amplifier, and some of the stimulated lines are assigned. It is then concluded that the origin of these stimulated emission lines is the A Σ -X Σ transition. Also it can be explained that these stimulated lines come from around the band edge of the A Σ -X Σ transition.