Collision kernels from velocity-selective optical pumping with magnetic depolarization

被引：4

作者：

Bhamre, T. ^{[1
]}

Marsland, R., III ^{[2
]}

Kominis, I. K. ^{[3
]}

McGuyer, B. H. ^{[1
]}

Happer, W. ^{[1
]}

机构：

[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

[3] Univ Crete, Dept Phys, Iraklion 71103, Greece

来源：

PHYSICAL REVIEW A | 2013年 / 87卷 / 04期

关键词：

D O I：

10.1103/PhysRevA.87.043412

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We experimentally demonstrate how magnetic depolarization of velocity-selective optical pumping can be used to single out the collisional cusp kernel best describing spin- and velocity-relaxing collisions between potassium atoms and low-pressure helium. The range of pressures and transverse fields used simulate the optical pumping regime pertinent to sodium guidestars employed in adaptive optics. We measure the precession of spin- velocity modes under the application of transverse magnetic fields, simulating the natural configuration of mesospheric sodium optical pumping in the geomagnetic field. We also provide a full theoretical account of the experimental data using the recently developed cusp kernels, which realistically quantify velocity damping collisions in this optical pumping regime. A single cusp kernel with a sharpness s = 13 +/- 2 provides a global fit to the K-He data. DOI: 10.1103/PhysRevA.87.043412

引用

页数：5

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