Ra Ion Clock With Micro-Comb THz Transition for Low-SWaP Timing
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Solution Overview
Problem
Current atomic clocks used for inertial navigation and GPS receivers are either too large, heavy, and power-hungry or too inaccurate and unstable for demanding applications, and they are sensitive to environmental temperature, requiring extensive calibration and having limited mission durations.
Innovation Solution
A micro-comb terahertz ion clock based on radium (Ra) ion transitions, utilizing an ion trap, cooling laser, re-pumping source, and micro-resonator-based frequency comb to drive multi-terahertz transitions between metastable levels, which reduces the need for high-SWaP components and stabilizes the clock frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional atomic clocks are used to achieve high accuracy and stability, then timing precision is improved, but size, weight, and power consumption increase significantly
Solution Approach 1:
The patent replaces the traditional mechanical/optical clock system with a quantum-based ion trap system. By using trapped radium ions and laser-cooled atoms as frequency references, the system achieves high timing accuracy without the bulky mechanical components of conventional atomic clocks, thereby reducing weight while maintaining measurement precision.
Solution Approach 2:
The patent changes the operating parameters by using ion transitions at terahertz frequencies instead of traditional microwave or optical transitions. This parameter change enables the use of compact frequency division techniques to generate stable RF timing signals, achieving high accuracy with reduced size and weight.
2Measurement precision
If conventional atomic clocks are used to achieve high accuracy and stability, then timing precision is improved, but device complexity and calibration requirements increase
Solution Approach 1:
The patent implements self-service through the use of laser-cooled atoms and ions that naturally maintain their frequency standards without external calibration. The trapped radium ions and laser-cooled atoms provide inherent frequency stability, eliminating the need for complex calibration procedures and reducing device complexity while maintaining high timing accuracy.
3Volume of moving object
If compact vapor cell clocks are used to reduce size, then SWaP is improved, but stability and accuracy deteriorate significantly
Solution Approach 1:
The patent substitutes the vapor cell mechanism with a trapped ion and laser-cooled atom system. This replacement eliminates the temperature-sensitive vapor cell while maintaining compact size, achieving both small volume and high timing accuracy through quantum-based frequency references that are inherently stable and insensitive to environmental variations.
4Volume of moving object
If vapor cell clocks are used to achieve compact size, then portability is improved, but temperature sensitivity and aging increase
Solution Approach 1:
The patent changes the physical state and operating parameters by using trapped ions and laser-cooled atoms instead of vapor cells. This parameter change makes the frequency reference insensitive to temperature variations and eliminates aging effects, achieving both compact size and high reliability with improved portability for navigation applications.
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
The micro-comb terahertz Ra ion clock achieves improved stability and accuracy with reduced size, weight, and power consumption, providing a more reliable and long-lasting timekeeping solution for navigation and communication systems.
Implementation Method 1
The cooling laser can facilitate trapping of the plurality of Ra+ ions within the ion trap and populate excited state levels in the trapped Ra+ ions
Implementation Method 2
The re-pumping source can trigger decaying of the excited state levels to a first metastable level
Implementation Method 3
The frequency comb source can directly drive a multi-terahertz (multi-THz) transition between the first metastable level and a second metastable level in the trapped Ra+ ions
Data Source
AI summary
An ion-based atomic clock includes an ion trap, a cooling laser, a re-pumping source and a frequency comb source. The ion trap can trap a plurality of Ra+ ions generated by an ion generator. The cooling laser can facilitate trapping of the plurality of Ra+ ions within the ion trap and populate excited state levels in the trapped Ra+ ions. The re-pumping source can trigger decaying of the excited state levels to a first metastable level. The frequency comb source can directly drive a multi-terahertz (multi-THz) clock transition between the first metastable level and a second metastable level in the trapped Ra+ ions. A signal derived from the population remaining in the first metastable level following the driving of the clock transition can be used to guide the repetition rate of the frequency comb source to an accurate frequency related to the clock transition frequency.