Remote atmospheric optical magnetometry
Remote atmospheric optical magnetometry
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DOI：
10.1063/1.4892568
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发表时间：
2014-08-14
影响因子：
3.2
通讯作者：
Ting, Antonio
中科院分区：
文献类型：
--
作者：
Johnson, Luke A.;Sprangle, Phillip;Ting, Antonio
本文采用分子氧作为顺磁物质，对远程大气磁力测量概念进行了分析。其目的是利用这种机制进行水下和地下物体的远程探测。克尔自聚焦用于将偏振的高强度激光脉冲聚焦在远程检测位点，在该远程检测位点处激光脉冲在氧磁化电流中引起振铃。该电流在激光脉冲后面产生共同传播的电磁场，即，韦克菲尔德，其具有取决于背景磁场的旋转极化。水下和地下物体的检测特征是不同测量位置之间的韦克菲尔德偏振的变化。采用耦合麦克斯韦密度矩阵方程描述了强激光脉冲和磁场作用下氧的磁化强度。所考虑的磁偶极跃迁线是氧在762 nm附近的B（1）Sigma（+）（g）- X-3 Sigma（-）（g）跃迁带。主要的挑战是大气氧跃迁的碰撞退相和有效磁偶极相互作用的强度。(C)2014 AIP Publishing LLC.
In this paper, an analysis of a remote atmospheric magnetometry concept is considered, using molecular oxygen as the paramagnetic species. The objective is to use this mechanism for the remote detection of underwater and underground objects. Kerr self-focusing is used to bring a polarized, high-intensity, laser pulse to focus at a remote detection site where the laser pulse induces a ringing in the oxygen magnetization current. This current creates a co-propagating electromagnetic field behind the laser pulse, i.e., the wakefield, which has a rotated polarization that depends on the background magnetic field. The detection signature for underwater and underground objects is the change in the wakefield polarization between different measurement locations. The coupled Maxwell-density matrix equations are used to describe the oxygen magnetization in the presence of an intense laser pulse and ambient magnetic field. The magnetic dipole transition line that is considered is the b(1)Sigma(+)(g) - X-3 Sigma(-)(g) transition band of oxygen near 762 nm. The major challenges are the collisional dephasing of the atmospheric oxygen transitions and the strength of the effective magnetic dipole interaction. (C) 2014 AIP Publishing LLC.