Collisional depolarization and redistribution of laser radiation in near resonance with a2 P 3/2?2 S 1/2 transition

Abstract

We have investigated experimentally and theoretically the spectral distribution and collisional depolarization of laser light near resonant to the Na transition 3 2S1/2~---,3 2P3/2 scattered from a Na/Ar mixture in a cell (nNa ~ 4.0 x 101 o cm 3, nAr ~ 1.0 X 1017 cm-3). In particular, at excitation intensity of ~3mW/mm 2 and bandwidth of <10MHz, intensity I F and linear polarization degree P~ of the D2-fluorescence component of the scattered spectrum have been measured as functions of the laser detuning A2 L from the D2-resonance within two regions: 1) I A 2LI < Doppler-width; 2) 20 > I A 2c[/A/l o > 1. Within the first region the influence of hyperfine splitting as well as pumping of the hyperfine and Zeeman sublevels of 3 2S1/2 was studied in detail. Using an overall, total collision cross section for depolarization of 3 2P3/2 state atoms, calculations on the basis of the theory of redistribution reproduce qualitatively, but in a consistent manner, the experimental functions lr(A 2i.) and Pp(A2L). The possibility to derive differential cross sections from Pv(A2L) is discussed.

Polarisation-monitored collisional redistribution experiment in Hg(3P1-1S0)-Kr

“…Previous polarisation-monitored collisional redistribution experiments have been conducted by Alford et a1 (1984) for the case of a J = 0 + 1 transition in Sr and Ba perturbed by the rare gases and by Kroop and Behmenburg (1980) for the J = f + 2 case in Na perturbed by Ar. To perform a quantitative test of redistribution theories, a system must be studied for which the interatomic potentials are well known.…”

Pressure Broadening and Shift of the 326.1 nm Cd Line Perturbed by H2and D2

“…Laser UV output power was monitored using the COHERENT LABMASTER+ power meter equipped with LΜ-2 UV head. Because the incident laser UV beam was linearly polarized in the vertical direction the collection optics arm contained a linear polarizer set at the "magic angle" (rotated 54.7° from the vertical), so the collection optics system was insensitive to effects due to anisotropy of fluorescence [13][14][15][16][17]. The photon counting process was performed by an electronic system built in the CAMAC standard described elsewhere [1].…”

Far-wing collisional redistribution of light in the barium-rare gas systems

“…Nevertheless, a series of experimental and theoretical investigations have been completed with very satisfactory results [13][14][15][16][17][18][19][20][21], in particular for the Na-Ar system, for which the first polarization results for collisionally redistributed light were reported [13]; see also [22].…”