Cold Atom Resonator Layout for Compact Hermetic Atomic Clocks
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Solution Overview
Problem
The challenge lies in developing a compact atomic clock with a hermetically sealed physics package that allows for the introduction of light and is constructed from non-magnetic materials, while maintaining stability and precision, as traditional methods face difficulties in miniaturization without compromising performance.
Innovation Solution
A cold atom microwave frequency standard is designed with a vacuum cell and a cylindrically symmetric resonator, where the vacuum cell is hollow with faceted windows for laser beam entry and a hermetically sealed central cylinder, and the resonator generates a persistent microwave field, allowing for the trapping and measurement of atoms within a compact, non-magnetic structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional atomic clock designs are used, then stability and precision are maintained, but device size remains large and cumbersome
Solution Approach 1:
The physics package is divided into distinct functional modules: a vacuum cell containing the atomic vapor, separate laser systems for cooling and probing, magnetic field generation components, and detection systems. This modular segmentation allows each component to be optimized independently while maintaining overall system performance, enabling miniaturization without sacrificing stability and precision
Solution Approach 2:
The patent implements a nested configuration where the vacuum cell is positioned within a resonant cavity, which is in turn enclosed by magnetic shielding. This nested arrangement allows multiple functional elements to occupy overlapping spatial volumes, maximizing the use of available space and reducing the overall device footprint while maintaining the necessary isolation and field configurations for accurate atomic frequency measurement
2Volume of moving object
If the physics package is miniaturized, then device size is reduced, but hermetic sealing and light introduction become more difficult
Solution Approach 1:
The vacuum cell utilizes a glass envelope with integrated optical ports that can be hermetically sealed using precision glass bonding techniques. The faceted window design allows laser beams to enter the vacuum cell at specific angles while maintaining the hermetic seal, solving the challenge of introducing light into a miniaturized sealed environment
Solution Approach 2:
The patent employs angled borings and faceted windows that introduce light paths in three-dimensional space rather than simple linear openings. This dimensional approach allows laser beams to penetrate the hermetic seal at oblique angles, enabling light introduction into the compact vacuum cell without compromising the seal integrity or requiring larger opening areas
3Volume of moving object
If the physics package is miniaturized, then device size is reduced, but construction from non-magnetic materials becomes more challenging
Solution Approach 1:
The physics package employs composite construction using non-magnetic materials such as glass for the vacuum cell envelope, non-magnetic metal alloys for structural components, and specialized coatings for optical surfaces. This composite approach allows the miniaturized package to maintain mechanical strength and structural integrity while avoiding magnetic interference with the atomic transitions being measured
Solution Approach 2:
The patent applies non-magnetic material requirements selectively to specific regions where magnetic field interference would affect atomic transitions, while allowing magnetic shielding materials to be used in external protective structures. This localized application of material constraints simplifies the overall construction challenge by focusing non-magnetic requirements only where absolutely necessary for measurement accuracy
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 configuration enables the creation of a compact, high-performance atomic clock that maintains stability and precision, allowing for the miniaturization of atomic clocks while ensuring hermetic sealing and non-magnetic construction, facilitating the development of miniature atomic physics packages.
Implementation Method 1
a cylindrically symmetric resonator encircling the central cylinder, wherein the resonator generates a microwave field in the hollow volume at the resonant frequency of the atoms
Implementation Method 2
a laser cooled atomic clock operates by trapping and manipulating atoms with light beams from one or more lasers
Data Source
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AI summary
Systems and methods for a cold atom frequency standard are provided herein. In certain embodiments, a cold atom microwave frequency standard includes a vacuum cell, the vacuum cell comprising a central cylinder, the central cylinder being hollow and having a first open end and a second open end; a first end portion joined to the first open end; and a second end portion joined to the second open end, wherein the first end portion, the central cylinder, and the second end portion enclose a hollow volume containing atoms, the first end portion and the second end portion configured to allow light to enter into the hollow volume. The cold atom microwave frequency standard also includes a cylindrically symmetric resonator encircling the central cylinder, wherein the resonator generates a microwave field in the hollow volume at the resonant frequency of the atoms.