NEW OPTICALLY-PUMPED ALKALI METAL DIATOMIC LASERS

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1983

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Ohio State University

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We have obtained many new optically-pumped laser (OPL)lines when dimers of sodium and lithium are pumped with an argon ion or Krypton ion laser. These large frame lasers (operated on a single longitudinal mode) are used to excite $B^{1}\Pi_{u}\rightarrow X^{1}\Sigma_{g}^{+}$ (for $Na_{2}$ and $ Li_{2}$) and $A^{1}\Sigma_{u}^{+}\rightarrow X^{1}\Sigma_{g}^{+}$ (for $Na_{2}$) multiline laser oscillation of these dimers in a ring cavity. Analysis of the associated fluorescence spectra results in the assignment of most OPL lines. In addition to the (predominantly) bound-bound OPL transitions (including lower laser levels up to dissociation), in the case of pumping sodium dimers (with the 568.2 nm out put of a Krypton ion laser) stimulated bound-free emissions have been observed for the first time between two strongly bound molecular states $(A^{1}\Sigma_{u}^{+}\rightarrow X^{1}\Sigma_{g}^{+} continuum)$ at -805 and 817.5 nm.

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Author Institution: Iowa Laser Facility, University of Iowa; Iowa Laser Facility, 3B-611A, Bell Telephone Laboratory; MHD Energy Center, Mississippi State University; Department of Chemistry, Drexel University Philadelphia

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