System and method for femtotesla direct magnetic gradiometer using a multipass cell
US11953569B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2021 |
| Grant date | Apr 9, 2024 |
| Priority date | — |
| Expiry date | Jun 30, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
According to various embodiments, a direct magnetic gradiometer having intrinsic subtraction of rotation signals from two oppositely polarized atomic ensembles within a single multi-pass cell is disclosed. The gradiometer includes three convex spherical mirrors aligned in a V-shape geometry. The three convex spherical mirrors include a front mirror and two back mirrors. The gradiometer further includes a probe laser beam. The laser beam is configured to be initially focused at a near-zero angle into a hole at a center of the front mirror such that the laser beam expands at the back mirrors and nearly overlaps with itself while undergoing multiple reflections between the front and back mirrors. The laser beam is further configured to be refocused to the front mirror at different spots in a number equal to half of total beam passes before exiting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.