Abstract
This paper reports the UV and violet diffuse band radiation generated by two-photon pumping in Na2 by focusing the pumping beam (~ 10 mJ) from a pulsed dye laser into a heat-pipe oven containing sodium. Measurable forward stimulated diffuse band radiation existed at 350.0-385.0 nm and 405.0-460.0 nm over the whole pumping region from 620.0 to 670.0 nm. The radiation corresponded to transitions from different high-lying triplet g states to the lowest triplet state. The signal intensity related to the pumping wavelength. The stronger signals were there where two-photon pumping was enhanced by singlet-triplet mixing levels. The weaker signals were assumed to relate to the collisions either transferring energy from the to the b3Πg state after the first photon excitation and then pumped by the second photon excitation from the b3Πg state to a high-lying state, or were due to collisional transfer from a high-lying singlet to a nearby triplet state.
© 1986 Optical Society of America
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