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FOLLOWING THE PULSED DYE-LASER EXCITATION OF ATOMIC BARIUM

Marı́a N. Sánchez Rayo

Published Jan 1, 1997• 0 citations
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Barium atomic vapours were obtained in a cross-shaped heat pipe in the presence of argon. In the temperature range explored (900°-1050°C), the population was ~ 1016 to 1017 cm-3. The transverse and axial (relative to the laser beam) emissions were recorded with the aid of a photomultiplier coupled to an SRS Model 280 boxcar averager. Filters and dichroic mirrors were used to suppress the laser line during axial observations. The dye laser was pumped by a doubled or tripled Nd-YAG laser operating at 10 Hz with 13 ns pulses. The domain explored (725nm > λ > 490nm) correspond to the dyes LDS 698, Rh 590, F548 and C 500. The pulse energies (100-300 µJ) and focussing conditions correspond to an intensity of 100-300 MW/cm2. The dye laser beam was linearly polarised.