Whispering Gallery Mode Resonator Optical Frequency Comb
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Solution Overview
Problem
Current technologies for generating stabilized oscillation signals and clock signals, particularly in RF and microwave domains, face challenges in achieving precision and compactness using atomic references, as they often require complex systems and high power levels.
Innovation Solution
The use of tunable optical frequency comb generators based on nonlinear optical whispering gallery mode resonators, which employ laser light and atomic references to produce stable RF or microwave signals through nonlinear wave mixing, allowing for compact and adaptable devices with atomic reference precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RF or microwave oscillators with atomic references are used, then clock signal precision can be achieved, but device complexity and size increase significantly
Solution Approach 1:
The patent replaces conventional RF/microwave electronic oscillators with an optical resonator-based system. The optical resonator generates optical frequency combs through nonlinear optical effects, which are then converted to stable RF/microwave signals. This substitution of the oscillation generation mechanism from electronic to optical domain achieves atomic-clock precision with reduced complexity.
Solution Approach 2:
The system uses tunable lasers to generate optical frequency combs with adjustable parameters. By changing the laser frequency and controlling the optical resonator's Q-factor, the system can generate stable RF/microwave signals at different frequencies while maintaining atomic reference precision, providing both precision and adaptability.
2Measurement precision
If conventional atomic clock systems are implemented, then atomic reference precision is achieved, but power consumption increases
Solution Approach 1:
The patent replaces power-hungry RF/microwave electronic amplifiers and oscillators with a passive optical resonator system. The optical resonator utilizes nonlinear optical effects (such as four-wave mixing) to generate frequency combs without requiring high power electronic amplification, thereby achieving atomic reference precision with significantly reduced power consumption.
3Volume of moving object
If compact optical resonators are used, then device size is reduced, but achieving sufficient Q-factor for atomic precision becomes difficult
Solution Approach 1:
The patent employs optical resonators with carefully optimized parameters including high Q-factor designs, specific mode selections, and controlled coupling conditions. By adjusting the resonator's physical parameters (size, shape, material) and operating parameters (laser frequency, input power), the system achieves both compact size and sufficient frequency stability for atomic precision 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
This approach enables the generation of highly stable and compact RF or microwave oscillators with precision comparable to atomic clocks, utilizing the high precision of optical atomic transitions and achieving low power operation.
Implementation Method 1
an optical resonator which exhibits optical nonlinearity and is configured to be a whispering gallery mode resonator supporting optical whispering gallery modes
Implementation Method 2
nonlinear wave mixing in the optical resonator
Implementation Method 3
a locking circuit that locks at least one of the optical resonator or the laser in frequency relative to the atomic or molecular transition of the atomic reference device
Implementation Method 4
directing the optical resonator output into a photodetector to produce a detector signal at a frequency of a frequency difference
Data Source
Figure 1A
Figure 1B~1D
Figure 2A~2B
AI summary
Techniques and devices based on optical resonators made of nonlinear optical materials and nonlinear wave mixing to generate optical combs that are stabilized relative to an atomic reference.