J. Phys. Colloques
Volume 48, Numéro C7, Décembre 19871st International Laser M2P Conference
|Page(s)||C7-577 - C7-579|
J. Phys. Colloques 48 (1987) C7-577-C7-579
GENERATION OF COHERENT IR, VISIBLE AND UV RADIATIONS BY TWO-PHOTON PUMPING IN ATOMIC BARIUMM. TALEB1, G. FABRE1, R. STRINGAT1, J. d'INCAN2 and C. EFFANTIN2
1 Laboratoire d'Optique Atomique et Moléculaire, Faculté des Sciences, Parc Valrose, F-06034 Nice Cedex, France
2 Laboratoire de Spectroscopie Ionique et Moléculaire (CNRS UA-171 et Greco Celphyra). Université Claude Bernard, Lyon-I, 43 Bd du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France
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.