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Optics Communications

Collision-produced Na2 diffuse violet band

A. Kopystyńska, Pawel Kowalczyk

Published Jan 1, 1979• 26 citations
Publisher
DOI
10.1016/0030-4018(79)90173-1

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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 A ′ Σ u + to the b3Π g state after the first photon excitation and then pumped by the second photon excitation from the b3Π g state to a high-lying state, or were due to collisional transfer from a high-lying singlet to a nearby triplet state.