Abstract
We have applied diode laser gain spectroscopy to quantitative spectral measurements and 2-D images of small-signal gain in optically pumped cesium-rare gas mixtures. Results are illustrated for Cs absorption broadened by Kr, with C2H6 added to induce spin-orbit mixing between the upper states (2P1/2 and 2P3/2) of the two transitions. The imaging technique provides spatial information relevant to the beam quality of the alkali laser output. Spectral and spatial gain measurements of this type are applicable to investigations of power scaling in advanced diode-pumped alkali laser systems, for both the spin-orbit mixed and exciplex-assisted configurations.
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