Magneto-Optical Trap Layout With Five-Beam Compact Illumination

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Solution Overview

Problem

Existing magneto-optical trap apparatuses are large and complex, making it difficult to reduce their size while maintaining functionality for applications such as optical lattice clocks.

Innovation Solution

A magneto-optical trap apparatus with a simplified structure, utilizing a first illumination portion to illuminate at least three laser beams on the same plane and a second illumination portion to illuminate two laser beams intersecting the plane, reducing the number of optical elements and windows, and allowing for a more compact design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If traditional magneto-optical trap apparatus structures are used, then reliable atom trapping functionality is achieved, but the apparatus size becomes large and complex

Engineering Contradiction:

Improveapparatus sizeVSAvoidstructural complexity

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

The patent combines multiple laser beams (at least three on the same plane and two intersecting the plane) into a unified illumination system that converges at a single point in the trap space. This merging of illumination paths reduces the number of separate optical components and windows needed, thereby reducing apparatus size and structural complexity while maintaining effective atom trapping functionality

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The illumination portions are designed to serve multiple functions: the first illumination portion provides lateral confinement while the second illumination portion provides axial confinement, and both contribute to the overall magneto-optical trapping effect. This multi-functionality reduces the need for separate dedicated components for each trapping dimension, simplifying the overall apparatus structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If multiple laser beams are illuminated from different directions, then effective three-dimensional atom trapping is achieved, but the number of optical elements and windows increases

Engineering Contradiction:

Improveatom trapping effectivenessVSAvoidnumber of optical elements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the illumination functions into two coordinated portions: the first illumination portion illuminates at least three laser beams on the same plane, and the second illumination portion illuminates two laser beams intersecting the plane. Both portions converge at a common point in the trap space, achieving three-dimensional atom confinement while minimizing the number of optical elements and windows compared to traditional multi-directional illumination systems

Inventive Principle:

Principle #5Merging (Combining)

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 proposed solution effectively reduces the size of the magneto-optical trap apparatus while maintaining its functionality, enabling more compact and portable implementations for various applications, including optical lattice clocks.

Implementation Method 1

a magnetic field generator that generates a magnetic field with a spatial gradient centered at a position in a trap space in which atoms are trapped

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

A laser beam is illuminated from an opening of the bore into the bore. The laser beam is a laser beam which propagates in a direction opposite the direction of propagation of the atomic beam, and which has a frequency obtained by correcting a Doppler shift term from an atomic transition resonance frequency. With a strong radiation force of the laser beam, the atomic beam is decelerated.

Methodology Applied

Scientific EffectRadiation pressure: Radiation Pressure

Implementation Method 3

The Zeeman slower decelerates, through Zeeman deceleration, an atomic beam emitted from the atomic oven and having a high initial velocity to a velocity at which the beam can be trapped by the magneto-optical trap apparatus in the second stage.

Methodology Applied

Scientific EffectZeeman deceleration: Zeeman Effect

Implementation Method 4

by forming, with the magnetic field generator, a magnetic field with a spatial gradient centered at the bore, a change of the Doppler shift due to the deceleration can be compensated for with the Zeeman shift, so as to achieve a situation in which the laser beam for deceleration always resonates with respect to the atom.

Methodology Applied

Scientific EffectDoppler shift: Doppler Effect

Data Source

PatentUS20250140435A1Magneto-Optical Trap Device, Physics Package, Physics Package for Optical Lattice Clock, Physics Package for Atomic Clock, Physics Package for Atomic Interferometer, Physics Package for Quantum Information Processing Device, and Physics Package System

Publication Date: 2025.05.01 RIKEN CO LTD

AI summary

In this magneto-optical trap device, five laser beams are irradiated in a trap space in which atoms are trapped. Of the five laser beams, three laser beams (laser beams a1, a2, a3) pass through the inside of the same plane (Z plane) and are irradiated in the trap space. The two laser beams that intersect that plane (laser beams a4, a5) are irradiated in the trap space. The laser beam a1 is used together as a slowing laser beam b for Zeeman slower.