Single-Laser Cold Atom Interferometer Light Source

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Solution Overview

Problem

Existing laser source systems for cold atom interferometers are large, power-intensive, costly, and prone to failures, with complex frequency manipulation and significant Raman sideband effects that impact precision and stability.

Innovation Solution

A single-laser light source system incorporating a reference light module, optical frequency shift module, and single-sideband modulation module, utilizing electro-optic and narrow-bandwidth optical-fiber filters to generate stable frequencies and eliminate Raman sidebands, with power control to stabilize output power and reduce Stark effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a multi-laser light source system is used to provide multiple frequencies for cold atom interferometer, then the system can achieve the required frequency diversity, but the system size, power consumption, and cost increase significantly

Engineering Contradiction:

Improvefrequency diversityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by stationary object

Solution Approach 1:

A single laser source is designed to perform multiple functions by generating multiple frequency components through electro-optic modulation. The single laser system can produce cooling light, repumping light, Raman light, and detection light at different frequencies, replacing the need for multiple separate laser sources and reducing overall power consumption

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The laser frequency is dynamically changed by adjusting the electro-optic modulation parameters. By varying the modulation frequency and depth, the single laser source can generate different frequency components required for various atom interferometer operations, achieving frequency diversity without multiple laser sources

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

Engineering Contradiction:

Improvefrequency diversityVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple laser functions are merged into a single laser source system. The single laser combined with electro-optic modulation modules integrates the capabilities of multiple separate lasers, reducing the number of devices and simplifying the overall system architecture while maintaining frequency diversity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single laser source is designed as a universal platform that can generate all necessary frequency components for cold atom interferometer operations through programmable electro-optic modulation, eliminating the need for multiple specialized laser sources

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Speed

If conventional phase modulation is used to generate Raman light, then the frequency requirements are met, but Raman sideband effects significantly impact measurement precision

Engineering Contradiction:

Improvefrequency modulationVSAvoidinterference precision

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The harmful Raman sideband components are extracted and removed from the modulated light using narrow-bandwidth optical-fiber filters. This filtering process separates the desired Raman light frequency from the unwanted sideband frequencies, eliminating their harmful effects on measurement precision

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Narrow-bandwidth optical-fiber filters are introduced as intermediary components between the electro-optic modulator and the atom interferometer. These filters act as mediators that selectively pass the desired frequency while blocking harmful sideband frequencies, protecting the measurement precision

Inventive Principle:

Principle #24Intermediary (Mediator)

4Device complexity

If a single-laser light source system is used to reduce system size and cost, then the system becomes more compact and economical, but the laser frequency must be highly tunable across a wide range

Engineering Contradiction:

Improvesystem integrationVSAvoidfrequency tuning range

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

Electro-optic modulation is used to replace mechanical frequency tuning methods. By applying electrical signals to the electro-optic modulator, the laser frequency can be rapidly and precisely tuned across a wide range without mechanical moving parts, achieving both compactness and wide frequency coverage

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The laser operating parameters are dynamically changed through electro-optic modulation. By adjusting the modulation frequency and amplitude, the single laser source can cover a wide frequency range required for different atom interferometer operations, achieving high adaptability in a compact system

Inventive Principle:

Principle #35Parameter changes

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 system achieves compactness, low power consumption, and high precision by using a single laser source for all frequencies, reducing complexity and cost, while eliminating Raman sidebands and improving long-term stability and precision of atom interferometers.

Implementation Method 1

The first electro-optic modulator receives an initial light from the laser source, modulates the initial light by a modulation signal with a preset frequency, and generates sidebands with the preset frequency

Methodology Applied

Scientific EffectElectro-optic modulation: Electro-Optic Effects

Implementation Method 2

The first narrow-bandwidth optical-fiber filter filters the optical signal at the output of the first electro-optic modulator to obtain a frequency-shifted light as the +1-order sideband

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Implementation Method 3

The reference light module includes a laser and a frequency stabilization module. The reference light module is configured to provide a laser source with stable frequency and narrow bandwidth

Methodology Applied

Scientific EffectFrequency stabilization:

Implementation Method 4

with power control to stabilize output power and reduce Stark effects

Methodology Applied

Scientific EffectPower control:

Data Source

PatentUS11733028B2Single-laser light source system for cold atom interferometers

Publication Date: 2023.08.22 NAT UNIV OF DEFENSE TECH

AI summary

A single-laser light source system for cold atom interferometers, comprising: a reference light module including a narrow-bandwidth laser and a frequency stabilization module and an optical frequency shift module including a first electro-optic modulator and a first narrow-bandwidth optical-fiber filter. The first electro-optic modulator is connected to the first narrow-bandwidth optical-fiber filter by an optical fiber, and the first electro-optic modulator is connected to the laser by an optical fiber. The first electro-optic modulator receives an initial light from the laser, modulates the initial light by a modulation signal with a preset frequency, and generates sidebands with the preset frequency. The first narrow-bandwidth optical-fiber filter filters the optical signal at the output of the first electro-optic modulator to obtain a frequency-shifted light as the +1-order sideband. The frequency-shifted light is used for modulation to obtain a measurement and control light of the cold atom interferometer.