Elimination of the Bloch-Siegert Effect in Optically-Pumped Magnetometers by Means of Multiple-Quantum Transitions,
Abstract
A limitation imposed upon an optically-pumped magnetometer is the alteration of the true magnetic field due to the Bloch-Siegert effect. This effect arises from the necessity of using a linearly-polarized disorienting field generated by a voltage-controlled oscillator. A method devised to overcome this limitation is described. In this method two disorienting oscillators are used to provide radiofrequency quanta at frequencies nu sub 1 and nu sub 2 and angular momenta, P sub 1 and P sub 2, consistent with the conservation principles which permit multiple-quanta transitions. If frequency nu sub 1 is generated by a crystal-controlled oscillator and nu sub 2 generated by a voltage-controlled oscillator such that nu sub 1>>nu sub 2, it is possible to provide a circularly-polarized disorienting field and virtually eliminate the Bloch-Siegert effect. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 22, 1971
- Accession Number
- AD0881662
Entities
People
- Louis R. Hirschel
Organizations
- Naval Ordnance Laboratory