Patent ID: 11953569
Assignee: THE TRUSTEES OF PRINCETON UNIVERSITY
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A direct magnetic gradiometer having intrinsic subtraction of rotation signals from two atomic ensembles within a single multi-pass cell, the gradiometer comprising:
three convex spherical mirrors aligned in a V-shape geometry, the three convex spherical mirrors comprising a front mirror and two back mirrors; and
a probe laser beam 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; and
be refocused to the front mirror at different spots in a number equal to half of total beam passes before exiting.