Ramsey-Bordé Ion Frequency Reference for Compact Stable Locking
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Solution Overview
Problem
Current optical frequency references are either extremely precise but large, heavy, and power-intensive, or compact but less stable, failing to provide a balance between size, weight, power, and stability, especially on short and long timescales.
Innovation Solution
An interferometric frequency-reference apparatus comprising a vacuum chamber, an atom source, an ionizer, an ion collimator, and probe lasers, which forms a collimated beam of ionized atoms for continuous Ramsey spectroscopy, enabling fast and stable frequency locking with reduced size and power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large optical cavity-based frequency references are used, then frequency stability is improved, but device size, weight, and power consumption increase
Solution Approach 1:
The patent extracts the essential function of optical frequency reference from large cavity structures and implements it using a compact ion trap system with laser cooling and Ramsey spectroscopy, achieving comparable stability in a miniaturized configuration
Solution Approach 2:
The patent replaces mechanical/optical cavity structures with an ion-based quantum system using electromagnetic fields and laser manipulation, eliminating the need for large physical cavities while maintaining frequency reference stability
2Weight of stationary object
If compact frequency references are used, then device size and power are reduced, but frequency stability deteriorates
Solution Approach 1:
The patent changes the operating parameters by using laser-cooled ions at ultra-low temperatures with extended interrogation times via Ramsey spectroscopy, achieving high stability in a compact device by optimizing quantum state parameters rather than physical dimensions
3Measurement precision
If conventional atomic clocks are used for long-term stability, then frequency precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the core frequency reference function from complex conventional atomic clock systems and implements it using a simplified ion trap with laser cooling and Ramsey spectroscopy, reducing system complexity while maintaining precision
Solution Approach 2:
The patent implements self-service through automated laser frequency stabilization, computer-controlled Ramsey spectroscopy sequences, and real-time data processing that automatically maintain frequency precision without complex manual intervention systems
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 provides a compact, ultra-stable optical frequency reference with low fractional frequency instability and fast readout capabilities, competitive with conventional atomic clocks, while minimizing size, weight, and power consumption.
Implementation Method 1
an ionizer configured to excite the neutral atoms to form ionized atoms
Implementation Method 2
one or more probe lasers at a frequency near the clock transition... configured to probe the ionized atoms
Data Source
AI summary
In some variations, an interferometric frequency-reference apparatus comprises: an atom source configured to supply neutral atoms to be ionized; an ionizer configured to excite the neutral atoms to form ionized atoms; an ion collimator configured to form a collimated beam of the ionized atoms; probe lasers; and a Doppler laser configured to determine a ground-state population of the ionized atoms, wherein the atom source, the ionizer, and the ion collimator are disposed within a vacuum chamber. Other variations provide a method of creating a stable frequency reference, comprising: forming ionized atoms from an atomic vapor; forming a collimated beam of ionized atoms; illuminating ionized atoms with first and second probe lasers; adjusting the frequencies of the first probe and second probe lasers using Ramsey spectroscopy to an S→D transition of ionized atoms; and determining a ground-state population of the ionized atoms with another laser.