Laser Architecture for Compact Atomic Interferometer Gravimeter

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Solution Overview

Problem

Existing atomic interferometers for gravimetry are large and cumbersome, limiting their mobility and utility in applications such as navigation, geodesy, and geophysical surveys due to the need for multiple lasers and separate beam paths, which increases device size and restricts their use in mobile applications.

Innovation Solution

The implementation of beam sharing and multiplexing techniques using a frequency-stabilized laser, wave guide modulator, and acousto-optic deflector to generate and combine MOT and Raman beams, allowing them to follow common and opposing paths within an atomic cloud interaction region, thereby reducing device size and enabling compact, mobile atomic interferometers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple lasers and separate beam paths are used to generate MOT and Raman beams, then the atomic interferometer achieves required functionality for precision gravity measurements, but the device size becomes large and cumbersome, restricting mobility

Engineering Contradiction:

ImprovefunctionalityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent combines multiple laser beams (MOT beams and Raman beams) into a shared optical path using beam combining techniques. The beams are generated by separate lasers but are spatially and temporally multiplexed to propagate together through common optical components, reducing the overall device footprint while maintaining all required functions for atomic interferometry and gravity sensing

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements a multi-functional optical system where a single optical path serves multiple purposes: the shared beam path is used for both magneto-optic trapping (MOT) and Raman interferometry operations. The system can dynamically switch between different beam configurations and functions using acousto-optic modulators and beam switching mechanisms, allowing one optical channel to perform multiple atomic manipulation tasks

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If multiple lasers and separate beam paths are used, then the atomic interferometer can perform precision measurements, but the device complexity increases with more components and separate beam paths

Engineering Contradiction:

ImproveprecisionVSAvoidcomplexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges multiple separate beam paths into a unified optical architecture where MOT beams and Raman beams share common optical components such as mirrors, lenses, and vacuum chamber interfaces. This consolidation reduces the number of independent beam paths from multiple separate systems to a single integrated optical train, simplifying alignment and reducing component count while preserving measurement precision

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs dynamic beam switching and modulation using acousto-optic modulators (AOMs) and electro-optic modulators (EOMs) that can rapidly reconfigure the optical path between different operational modes. This dynamic control allows the system to switch between MOT loading, Raman interferometry, and other atomic manipulation sequences without mechanical realignment, reducing operational complexity while maintaining precision

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach results in a compact, mobile atomic interferometer system capable of precise gravity measurements, enhancing its applicability in various fields by minimizing device size while maintaining sensitivity and accuracy.

Implementation Method 1

wave guide modulator, and acousto-optic deflector to generate and combine MOT and Raman beams

Methodology Applied

Scientific EffectWave guide modulation:

Implementation Method 2

acousto-optic deflector to generate and combine MOT and Raman beams, allowing them to follow common and opposing paths

Methodology Applied

Scientific EffectAcousto-optic effect: Acousto-optic Effect

Implementation Method 3

Atom interferometers exploit the wave-like properties of atoms to sensitively measure small differences between different atomic spatial trajectories. These wave-like properties of matter allow interference measurements to be exploited

Methodology Applied

Scientific EffectAtomic interference: Interference

Data Source

PatentUS20250020446A1Laser architecture for component efficient atomic interferometer gravimeter

Publication Date: 2025.01.16 AOSENSE

AI summary

A system for atom interferometry includes one laser configured to generate an output beam; an acousto-optic deflector disposed to generate two diffracted beams that are spatially offset with identical polarizations; and a birefringent crystal disposed to receive the two diffracted beams, where one of the two diffracted beams is passed through a half wave plate so that the two diffracted beams have orthogonal polarizations, where the birefringent crystal further disposed and selected in size to enable the two diffracted beams to re-overlap upon exiting the birefringent crystal by having one of the two diffracted beams walk toward the other of the two diffracted beams in the birefringent crystal, where the two diffracted beams have minimal path length differences so that the two diffracted beams are useable for interferometry.