Near-resonant dye laser scattering and two-photon absorption in a sodium neon plasma
- 1 February 1977
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 48 (2) , 653-661
- https://doi.org/10.1063/1.323649
Abstract
Two possible techniques for determining sodium densities in nonhomogeneous optically thick plasmas are investigated. The first one is single‐mode dye‐laser scattering in the near wings of the sodium D1 and D2 resonance lines. The second technique is near‐resonant two‐photon absorption with two counterpropagating single‐mode dye‐laser beams and detection of the fluorescence. In both cases, the laser frequency(ies) is (are) detuned far enough from (the intermediate) resonance to make the plasma optically thin for the laser beam(s) and for the directly scattered light, hence for the one‐step two‐quantum transitions. In the scattering experiment, the polarization properties of the scattered light are used for discrimination against the stepwise absorption‐reemission (the collision‐induced fluorescence). In the two‐photon absorption experiment, the residual Doppler broadening is small enough to make a clear distinction between the direct two‐quantum and the collision‐induced stepwise one‐quantum transitions. It is shown that the near‐wing scattering directly yields local sodium densities. This is not the case for the two‐photon absorption. The technique of near‐resonant scattering is also applicable to other metal vapors in discharges and neutral gases.This publication has 31 references indexed in Scilit:
- Comment on "Distinction between resonance Raman scattering and hot luminescence"Physical Review B, 1975
- Déplacement et élargissement de la transition à deux photons 3S-4D dans l'atome de sodium par collision contre des atomes de néonJournal de Physique Lettres, 1975
- Collisional depolarization of excited sodium atomsPhysica, 1974
- Positive column of Na–Ar and Na–Ne–Ar dc low-pressure dischargesJournal of Applied Physics, 1974
- Depolarization ratios for anti-stokes Raman scattering from In and T1Optics Communications, 1974
- Raman scattering cross sections for In and T1 atoms and multiphoton processes in SrOptics Communications, 1974
- Two-photon spectroscopy of Na 3s-4d without Doppler broadening using a cw dye laserOptics Communications, 1974
- Polarization of the fluorescent light of Ne atoms interacting with a laser beam measurement of several relaxation timesIEEE Journal of Quantum Electronics, 1968
- On the Shape of Collision-Broadened LinesReviews of Modern Physics, 1945
- Die Streuung des Lichts an angeregten AtomenThe European Physical Journal A, 1933