Remote atmospheric optical magnetometry
Abstract
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 b1Σg+−X3Σg− 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 08, 2014
- Source ID
- 10.1063/1.4892568
Entities
People
- Antonio Ting
- Bahman Hafizi
- Luke A. Johnson
- Phillip A. Sprangle
Organizations
- Office of Naval Research
- United States Naval Research Laboratory
- University of Maryland