Atomic Interferometer Using 2D Diffraction Grating for Multi-Axis Sensing
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Solution Overview
Problem
Existing atomic interferometers are not compact and cannot selectively measure acceleration or rotation along a predetermined set of directions, requiring multiple laser beams for each measurement axis.
Innovation Solution
An atomic interferometer using a two-dimensional diffraction grating to generate multiple diffracted beams, combined with adjustable optical frequency detuning, polarization states, and magnetic fields, allows for the selection of specific pairs of laser beams to measure acceleration along desired axes, enabling compact and directional sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple laser beams are used for each measurement axis, then measurement capability along multiple axes is achieved, but device complexity and size increase
Solution Approach 1:
A single laser source is designed to perform multiple functions by generating different pairs of laser beams through a two-dimensional diffraction grating. The same laser source can measure acceleration along different axes (X, Y, Z) by selectively using different beam pairs, eliminating the need for separate laser sources for each measurement axis.
Solution Approach 2:
The patent introduces a two-dimensional diffraction grating that converts a single incident laser beam into multiple diffracted beams in different directions. This spatial dimensionality transformation enables the generation of multiple beam pairs from one laser source, allowing measurement along multiple axes without proportionally increasing device complexity.
2Device complexity
If a single laser source is used for all measurements, then device compactness is improved, but ability to measure along specific directions is limited
Solution Approach 1:
The single laser beam is segmented into multiple diffracted beams through the two-dimensional diffraction grating. These segmented beams are then selectively paired to measure acceleration along different directions. The controller selects appropriate beam pairs based on the desired measurement direction, enabling a compact system to achieve directional measurement capability.
Solution Approach 2:
The system dynamically selects different pairs of laser beams from the diffracted beams based on the measurement direction required. The controller adjusts which beam pairs are used for different measurement axes, allowing the compact single-laser-source system to adapt its measurement capability dynamically rather than being fixed for a single direction.
3Measurement precision
If two-photon Raman transitions are used to separate and recombine atomic wave packets, then sensitivity to inertial effects is achieved, but requirement for multiple laser beams with different optical frequencies increases device complexity
Solution Approach 1:
The single laser source is designed to provide multiple pairs of laser beams with appropriate optical frequency differences for two-photon Raman transitions. By using the two-dimensional diffraction grating to direct different beams from the same source, the system achieves the sensitivity to inertial effects without requiring multiple separate laser sources with different frequencies.
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
Enables compact, directional sensitivity for atomic interferometry measurements along multiple axes using a single laser source and atom source, allowing for precise acceleration and rotation measurements.
Implementation Method 1
a two-dimensional diffraction grating arranged to receive the incident laser beam and form by diffraction at least three diffracted beams along at least three non-coplanar directions
Implementation Method 2
The majority of atomic interferometers use two-photon Raman transitions to separate, reflect and recombine atomic wave packets to form an interferometer
Implementation Method 3
polarization means configured to receive the source laser beam and generate an incident laser beam polarized according to an adjustable polarization state
Implementation Method 4
Obtaining a source of cold atoms requires a trapping and cooling step based for example on a magneto-optical trap which requires the use of laser beams in at least four directions in space
Implementation Method 5
detecting the state of interference of the waves of atoms at the output of the interferometer, for example by laser fluorescence on an absorption line of the atoms
Data Source
Figure 1
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Figure 6~7
AI summary
The invention relates to an atomic interferometer (100) comprising an atom source (1), a laser source (2) and a magnetic field generation device (6, 61, 62, 63), polarization means (4), an adjustment system (3) for a mismatch between two optical frequencies of the incident laser beam, a two-dimensional diffraction grating (5) arranged to receive the incident laser beam (11) and to form by diffraction at least three diffracted beams (12, 13, 14, 15), a controller (20) configured to select a combination of an optical frequency mismatch, a polarization state and a magnetic field, the combination being adapted to select a pair of beams from among the pairs of beams formed from the incident laser beam and the diffracted beams,The pair of laser beams is applied to interact with the atom cloud via multi-photon transitions and detect an acceleration of the atom cloud along a measurement direction.