Enhancement of optically pumped spin orientation via spin-exchange collisions at low vapor density

被引：34

作者：

Chalupczak, W. ^{[1
]}

Godun, R. M. ^{[1
]}

Anielski, P. ^{[2
]}

Wojciechowski, A. ^{[2
]}

Pustelny, S. ^{[2
,3
]}

Gawlik, W. ^{[2
]}

机构：

[1] Natl Phys Lab, Teddington TW11 0LW, Middx, England

[2] Jagiellonian Univ, Ctr Magnetoopt Res, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW A | 2012年 / 85卷 / 04期

关键词：

MAGNETIC-RESONANCE LINES; STATE;

D O I：

10.1103/PhysRevA.85.043402

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

An effect is demonstrated where off-resonant optical pumping is enhanced by spin-exchange collisions, which enables a high degree of spin orientation to be obtained in alkali-metal atoms. The experiment with room-temperature cesium vapor employs radio-frequency spectroscopy under conditions of the nonlinear Zeeman effect that allow the populations of the individual Zeeman sublevels to be determined. The improved efficiency of atomic orientation leads to a significant reduction of population relaxation out of the state with maximum magnetic quantum number m (stretched state), which is observed as a narrowing of radio-frequency resonances. Spin-exchange collisions play a crucial role in this effect although the applied atomic density similar to 10(11) cm(-3) corresponds to collision rates not greater than several tens of Hz. A simplified theoretical model has been developed to reproduce the measurement results numerically.

引用

页数：8

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