Quantum sensor technology through optical integration for gravimetry with cold atoms

The goal of the project is to develop a compact atomic gravimeter. The measurement principle is based on atom interferometry, using cold atoms. Nomad Atomics can realize such gravimeters on a laboratory scale, but systems are needed that can measure gravitational fields, for example, from a drone. To achieve a compact and lightweight system, a large part of the optical components and an Rb gas cell are to be integrated onto and within a glass platform.

Fraunhofer IZM is developing a variety of innovative solutions for the realization of the electrically and optically functionalized glass platform in the project. Among other things:

• Optical fibers: Single-mode fibers are being developed for the target wavelength of 780 nm.
• Splitters: Multimode interference couplers are being developed for various coupling ratios.
• Switches: Together with a partner under subcontract, a 1-to-n switch in glass is being developed. This is intended to switch the laser signal electrically to one of four channels.
• Rb cell: Laser welding processes are to be used to develop a Rb cell made of glass. This contains optical components for beam shaping to excite the Rb atoms, in addition to the hermetic cell.