J. Phys. IV France 01 (1991) C7-307-C7-310
A SINGLE-MODE, DIODE-PUMPED LMA LASER TO PROBE THE SPIN ORIENTATION OF ENSEMBLES OF 3He AND 4HeL.D. SCHEARER1, 2, S. ESSABAA1 and M. LEDUC3
1 Institut de Physique Nucléaire, F-91406 Orsay cedex, France
2 Physics Department, University of Missouri-Rolla, Rolla, MO 65401, USA
3 Laboratoire de Spectroscopie Hertzienne de l'ENS, F-75014 Park cedex 05, France
A diode-pumped Nd:Lanthanum Magnesium Hexaluminate laser was constructed which provides up to 15 mW of single-mode, tunable CW emission at 1083 nm. By appropriately polarizing the narrow-band laser emission (< 10 MHz), the laser can be used to determine the populations of the magnetic substates of the He ( 23S1) atoms. The laser is tuned to one of the absorption peaks of the helium metastable atom by tilting a thin (1 mm) solid, coated etalon placed inside the laser cavity and the absorption is measured. The relative absorption is used to determine the ensemble polarization ; the absolute absorption yields the metastable density.
© EDP Sciences 1991